1966 pontiac 421 engine specs

which was seen on the hood of the 1957 Daytona Grand National winning car driven by Cotton Owens. For the first time, Pontiac offered Tri-Power, three two-barrel carburetors with a sequential linkage (replacing the previous dual-quad set-up). Engine, horsepower, torque, dimensions and mechanical details for the 1966 Pontiac Catalina. It was rated at 376bhp in 1967 and 390bhp in 1968 and 1969. The 421 engine is available only with related heavy-duty driveline components. Engine Oil: 120 ft-lbs. It was rated at 360hp @4300 RPM in the GTO and 370 @ 4600 RPM in the Grand Prix and other full-size Pontiacs. moniker from the shaker due to the disappointing public approval as the motor was not deemed to be "High Output". This camshaft sported a 308-/320-degree duration with 0.47-inch (12mm) lift. The 301T block was significantly more durable than the standard 301 block and received a thicker bottom end. The W72 offered many improvements over the standard L78 400 Pontiac. It is probably best known for it's Tri-power option, which was optional on GTO's from 1964 through 1966.. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Model Number: Body/Style Number: Body Type & Seating: Factory Price: . All Rights Reserved. Calling into play enormous power and a decent 55/45 weight distribution, the 2+2 could be launched with little tire spin and guided through corners with alarming efficiency. It was offered in the following forms: For 1957 the V8's stroke was increased to 3.5625in (90.49mm), for a displacement of 347cuin (5.7L). Though production cars only got the two hood air inlets the name was retained. 093: 66 389 GTO: 65 . The 428 was factory installed in large cars only. With A/C On, Engine Hot: 421: 1966: With Tri-Carb, With Air Injection reactor: 45S: 0.035: For the 1978 model year, Pontiac re-incorporated the earlier thicker cast cast engine block denoted by the cast number 418988 and a "XX" cast into the side of the block. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. This is it! Fuel pump: Will use 110-gph Carter Sponsored Stories . The W72 also featured a camshaft with a higher duration, finer tuned 800cfm Rochester Quadrajet, insulated fuel line, larger 60PSI oil pump, chrome valve covers, a larger harmonic balancer, and the "T/A 6.6" Shaker decal. Engine block and cylinder heads were cast at Saginaw Metal Casting Operations then assembled at Tonawanda Engine before delivery to Pontiac Assembly for installation. I don't know if it can be done, but I'm going to try." Two different cylinder-head castings were used for the 1962 model year, both with a combustion chamber volume of 68cc (4.15cuin) to produce an 11.0:1 compression ratio. $6.49 shipping. For the 1969 and 1970 model years it was the standard engine in both the Firebird Trans Am and the GTO Judge. ENGINE. Displacement began at 287-cubic-inch (4.7L) and grew as large as 455-cubic-inch (7.5L) by 1970. The 421 SD became factory installed in 1962 and in 1963 a street version became available from the factory with a dual four-barrel or three two-barrel Tri-Power carburetion. There were 11 different Pontiac V8 engine options for 1966, starting with the 326-cid 250-hp Tempest base V8. The 455 HO designation made its debut in 1970; Rated at 360 or 370hp (268 or 276kW) (depending on which vehicle it was installed into) & 500lbft (678Nm) of torque, it differed from the regular full sized car 455 by large valve heads with smaller combustion chambers, and a larger camshaft. Get the best deals on Engines & Engine Parts for 1966 Pontiac GTO when you shop the largest online selection at eBay.com. Regarding Crower's upgrade suggestions for its . The Ram Air II also incorporated the first computer-designed camshaft. It had 2-bolt main bearing caps in 1969, but went to a block similar to the Ram Air IV's in 1969 that was drilled for 4-bolt main bearing caps (but used a cast crank and cast rods). The tri-power equipped XS-code 389 was shipped with the Ram Air pan in the trunk, and the dealer had to fit it and cut out the underside of the hood scoop to make it functional. Setting initial timing at idle with the vacuum advance disconnected will usually fall around 12 to 16 degrees, but that's not really important. Rated at 370 horsepower at 5,200 rpm and 460 pounds-feet of torque at 3,800 rpm, it has 10.75:1 compression, with induction through three Rochester two-barrel carbs, Pontiac's well-known "Tri-Power" setup. On premium fuel, it was rated at 207 hp at 5200 rpm and . Pontiac's initial plans were to use a camshaft with specs identical to the 041 Ram Air IV camshaft, but testing showed emissions, while technically compliant, did not have "cushion" to satisfy Pontiac's emissions engineers, to avoid production variation leading to any non-compliant engines being produced and sold. The 1971 455 HO was available in the Firebird (optional in Formula; standard in Trans Am), the GTO (standard with "The Judge" package), and the 2-door LeMans, LeMans T-37 (including GT-37), and LeMans Sport. The standard head seen on an L78 400 Pontiac was the low compression 6x8 head, while the 6x4 head seen on the W72 had hardened valve seats for a higher RPM operating range, improved air flow, and higher compression. Exhaust: 180 cfm at 0.500-in Bore and stroke were 4.121in 2.84in (104.7mm 72.1mm) 303.63cuin (4,976cc). See Consumer Guide Automotive's New-Car Reviews, Prices, and Information. High output Pontiac V8 Cylinder Heads. . Known as GM's performance-oriented division, Pontiac lived up to the hype by creating the first Muscle Car and kicking off the Muscle Car era. 1966 Pontiac Catalina Specifications and Production. The Pontiac 2+2 was promoted as the "big brother" to the iconic Pontiac GTO. Muscle Cars. The engine compartment of this concours Catalina is beautifully finished. The SD-455 motor was listed as an option in dealer brochures for the 1973 Grand Am and LeMans GTO(and planned for the Grand Prix as well) although none were produced for sale. [11] By mid-1978, the W72 could no longer be ordered in conjunction with the MX1 3-speed Turbo-Hydramatic 350 automatic transmission, and could only be ordered with the 4-speed manual transmission. The engines feature a cast-iron block and head and two valves per cylinder. On this Wikipedia the language links are at the top of the page across from the article title. Pontiac V8 Engine Tune-Up and Torque Specifications. The two inline engines were used through 1954, when Pontiac unveiled its OHV Strato Streak V8 in 1955. This was a completely stock car on loan from a private owner for the test. Year: CU IN: Casting # 1967: 326. He thinks the stock exhaust flow of 180 cfm will suffice for this build. Seat pressure: 110 pounds at 1.600-in It shared the 4.121in (104.7mm) bore of the 400, but with a 2.84in (72.1mm) stroke for a displacement of 303cuin (5.0L). As Pontiac still wanted to offer a performance motor to compete in the performance market, they looked back to the 400 Pontiac and how it could be improved to offer greater performance while meeting CAFE standards. The GTO's new hood scoop design, with the inlets centrally located and mounted above the carburetor, provided the opportunity for experimentation. Detroit, however, was reluctant to relinquish its time-tested biggest-car/best-engine formula. Ellingson Motorcars (877) 638-7170. Approximately 6,000 2+2's were built in 1966, the only year the 2+2 was its own model. Idel RPM Automatic In Drive Notes; 326: 1964: 45S: 0.035: . Most Pontiac engines like total timing (rev engine past 3000 or so until the mechanical advance stops moving/advancing, vacuum advance disconnected to check total timing) somewhere between 32 and 36 degrees. Jim told HPP, "Since I was a young man in the '60s, I always thought how great it would be to find a true 100hp in a legendary 421 Tri-Power setup that retained its iron heads and intake. The 389 would remain the standard Pontiac V8 engine through 1966, offered in a bewildering variety of outputs ranging from 215 to 368hp (160 to 274kW). The 1981 301 Turbo gained the electronic controls with an O2 sensor, feedback ECM and E4ME Quadrajet providing a slight reduction in output to 205hp (153kW) and 340lbft (461Nm).The 301 Turbo was limited to Trans Am and Formula Firebird production only. For the 1967 GTO the engine was rated at 360bhp (268kW; 365PS) and had the cast-iron headers. The 301.6cuin (4.9L) 301 was offered from 1977 to 1981 and also installed in other GM cars during those years. It's well documented that an internal combustion engine is nothing more than an air pump. In the early '60s, the engine program at the Pontiac division of General Motors was a wide-open operation that bustled with innovation. Pontiac engines were used in its U.S.-market cars; Canadian-built Pontiac automobiles generally used Chevrolet engines. (V8) - Stamped on right front side of block or beneath production . Engine Oil: 95 ft-lbs. Next time we will cover the induction system and the dyno testing to see if Jim meets his goal. This may have been propagated by the only authorized company that is licensed to reproduce these decals not including the "6.6 LITRE" in the Trans Am decal kits, and only including "T/A 6.6" with no extra cost. With a view to the latter, what we find lurking under the hood is the 421ci Tri-Power V8. Standard ratio with the 400 was 3.55:1(except 3.36:1 in Firebird for 1969) regardless of transmission(3.23:1 for cars with air conditioning). Note the tri-color Pontiac Ventura upholstery. [4] It was replaced by the 455 for the 1970 model year. Boost was wastegate limited to 91psi (0.6210.069bar). The short-deck block and different intake ports also required the design of a new intake manifold. In 1969 the 350 HO was upgraded again with the addition of the 400 HO cam, commonly referred to by enthusiasts as the 068 cam. In 1969, Pontiac unveiled its Trans Am model Firebird, and since racing rules required engines of less than 5L (305.1cuin), Pontiac unveiled the 303 for racing models only, never available to the public. The Pontiac 2+2 featured a 6.9 L V8 engine, heavy-duty front springs, dual exhaust and distinctive exterior body design. The 2+2 package was first offered as a $291 option on Catalina hardtops and convertibles in 1964. Based in part on designs for the "short deck" 303cuin (5.0L) engine designed for the 1970 racing season, it had a shorter deck than the big V8, and used thin-wall castings to reduce weight. However, the RA II was limited to a 1.50:1 rocker ratio, while the RA IV used a 1.65:1 ratio, which yielded significantly greater total lift and, therefore, superior flow and power. For 1969-1970 GTO the 400 HO included driver operable Ram Air induction and was renamed "400 Ram Air" for 1969 and just "Ram Air" for 1970. Block description: '64 421ci #157 If you enjoy the videos and would like to Sponsor me on Patreon, my Creator link is https://www.patreon.com/MyCarStoryWithLouOn "My Car Story" we're in Huntl. like the earlier 1971-1972 motor, but it was not the same motor, and featured standard d-port heads with a very conservative camshaft. . This is the original car featured in the May 1962 issue of Motor Trend Magazine that was modified by Royal Pontiac and driven by Jim Wangers. The code consists of 3 or 4 digits. Preparation: Install in rod, torque, measure ID The air cleaners look like those used on the top dog 376 gross HP 421 CI engine but there was also a lesser 356 HP version available too. It was the same engine as the '67-'68 400 HO[18] but for 1969 and 1970 it included a driver-selectable outside air induction system on the GTO(it was a separate option on Firebird), with the hood vents opened and closed using a knob located under the dash, below and to the right of the steering wheel, its bracket labeled "RAM AIR". Retainers: Crower steel Tri-power engine rated at 376 hp. The Pontiac V8 engine is a family of overhead valve 90 V8 engines manufactured by the Pontiac Division of General Motors Corporation between 1955 and 1981. Fuel line size: 38-inch, 516-inch to carburetor When Robert Critchfield took over as general manager in 1952, he launched an ambitious plan to move Pontiac into the upscale, mid-range market occupied by Oldsmobile, and that demanded V8 power. Intake: 218 cfm at 0.500-in Jim Taylor knows this, so he took a mathematical engineering-style approach to finding 100 hp in a relatively optimized engine. Pontiac RAIII/IV Engine parts collection Price $14000.00. Both engines received the McKellar number-10 camshaft, which was much like a solid-lifter version of the hydraulic number-041 of later years. In light of this, the 'Year' entry, as indicated by the chart below, may actually represent the year that the heads were cast, versus the year that they were actually installed on an automobile. In addition to the inline 6, Pontiac used the Oakland V8 for one year, 1932, debuting the Pontiac straight-8 engine in 1933. This new material had stronger alloys in the iron. Bolts or Parts: Lube or Sealer: Torque to: Main Caps. Cam choice is always extremely important, and Jim decided to go with an aggressive Crower mechanical flat-tappet stick with 247/252-degrees duration at 0.050 and 0.515/0.525 lift (0.495/0.505 with 0.020 lash) with 1.6:1 rockers. In 1973 Pontiac started stamping extra numbers (1/4" tall) on their heads.These head numbers represented chamber sizes.They are usually stamped on the machined pads by the valve covers. From a performance perspective, the 2+2 is pretty impressive. It was factory rated at 366hp at 5,400 RPM and 445lbs.ft. At the request of Ed Cole, general manager of Chevrolet, the layout was also used by the Chevrolet V8 released in 1955, an exception to the customary GM policy of allowing a division one year of exclusive use of an internally developed advance. Like previous generations of Ram Airs, it used Pontiac's special cast-iron "headers". Made with a provision for dry sump oiling, it truly was a racing engine, detuned for use in passenger cars. Thus, the quest to find 100 hp in a 421 started on the flow bench, before a wrench or machine tool touched any part of the 49-year-old engine. 301 4-barrel 'W72' or 'ESC' (170hp, 127kW) (with the 5th character of the VIN being a "W" for 1979-1980 and the 8th for 1981). By comparison, the factory 421 H.O. Pontiac produced the 421 V8 engine from 1961 to 1968. The inlets were all well within the boundary layer that exists close to the surface, so all of these systems would more accurately be described as "outside air induction" systems, benefiting from the intake of cooler, and thus denser, outside air versus the comparatively hotter and less dense air under the car's hood. Compression Ratio: 10.6:1 effective engine for 1963 is reported to be putting out 500 ft-lbs torque at 4,200 rpm and . Casting number: 97770716, '64 date Only about 2000 like this one were built with 4 speed Muncie transmissions. The 1972 455 HO was rated at 300hp (224kW) @ 4,000rpm and 415lbft (563Nm) @ 3,200rpm. Secondary: Front and rear #70 Beginning in 1967 casting numbers moved to the rear of the block just behind cylinder #8. Also, a rumored 75 cars were built with non-Super Duty 421 engines rated at 320 bhp. The heart of the build, a code 45B 1964 421 HO 370 HP manual trans 4-bolt main block, all Pontiac 421 engines without exception had 4-bolt main caps. The 2+2 reverted to option status for '67, then died, a proud relic of a time when big cars, Pontiacs in particular, ruled the streets. It was the top-of-the-line engine unless one opted for the "Ram Air" V-8 derived from it. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. The 421.19cuin (6.9L) was introduced in 1961 as a dealer-installed Super Duty option. The engine was dubbed the TEMPEST V-8, a nickname it retained until the end of 1960. They acquired the featured Montero Red 1966 Pontiac Catalina post car, which was equipped from the factory with the 421 H.O. Manage Settings He says the Tri-Power setup modified with the addition of the larger '66 center carb will flow 1,050 cfm. One of the key upgrades were the 6x4 heads. In 1968, there was also a 350 "HO" which had increased power with the addition of higher compression #18 heads (#17 and #46 were the most common 2-barrel heads), a four-barrel carburettor and matching intake that was also used on the 400 and 428 engines. The four-barrel version, set up for sustained high speeds, had 390 hp. The 338-bhp four-barrel was the base engine. It featured a smaller bore of 3+34in (95.3mm) coupled with the same 3in (76.2mm) stroke of the 301 (same bore and stroke used by Chevrolet when the first small block motor was introduced in 1955). A set of Hooker Super Comp headers will be used on the dyno, and Jim is porting the stock heads to increase intake-port flow by 30 cfm. An example of data being processed may be a unique identifier stored in a cookie. A common misconception made by enthusiasts was the notion that all Pontiac engine equipped Trans Ams featured the "T/A 6.6" decal on the shaker, however, it was exclusive to the W72 engine that was featured on less than half of all Trans Ams made during this period. Mods: Intake port match, valve bowl blend, improved short-turn radius In 1967, Pontiac moved on to a technologically simpler nodular cast iron (invented in late 1940s) crankshaft, which they used until 1975. Keepers: Comp Cams race locks As a result, it was remarkably free of teething problems. Piston-to-deck height: 0.009-in SB International 00958 1963-1966 Pontiac 389 421 Engine 1.920" Intake Valves (Fits: 1966 Pontiac GTO) $7.98. Centerline: 110-deg Given how late in the model year it was, Pontiac decided not to incur the costs of recertifying the SD-455 for other models other than the Firebird. It used the "744" camshaft (301-313) in the earlier manual trans versions, later downgraded to the "068" version, and the 288/302 duration cam with automatic transmission. Head bolts do not pull on the cylinder wall causing distortion. This was based on results of over 1 million test miles, which was unheard of at the time. Based on the same short-deck as the 301, the "LS5" 265.1cuin (4.3L) was offered only in 1980 and 1981. Unique exterior features included "2+2" badges, twin lens taillamps, and chrome bodyside gills; Pontiac's famous eight-lug aluminum wheels were the ultimate optional touch. All Pontiac Bonneville Convertible versions offered for the year 1966 with complete specs, performance and technical data in the catalogue of cars . He wanted to confirm his parts are up to the task of holding the cylinder pressure that creates horsepower. 744) and a new valve spring package with dampers to positively control valve action. Metallurgy of the critical parts is an area often overlooked, but not by Jim Taylor. To learn everything you need to know about car engines, see. Bore/Stroke ratio: 1.04:1 Dual Carter Carburetor 500cuft/min (14m3/min) #3433S (front) and #3435S (rear) carburetors with manual chokes and mechanical linkage. Initial advance: 18-deg . / 8.3 mpg (U.S.) / 3.6 km/l, more data: 1966 Pontiac Catalina 2 . With higher compression and dual exhaust it produced 280hp (209kW) for 19631964, and 285hp (213kW) for 1965 through 1967, its final year. In 1961 Pontiac continued to push the horsepower upwards with the release of the 421 engine. Hewing to GM's standing edict limiting engine size to 400 cu in for its midsize and smaller cars, the 360hp (268kW) (underrated),[citation needed] the 400 cubic inch Ram Air V-8 was the most powerful and advanced option available in the 1967 GTO and Firebird. Wires: NAPA Belden 7 mm For '65, the 421-cid V-8 became a standard part of the option package, and for '66, Pontiac made the 2+2 a separate model, still based on the Catalina two-door hardtop or convertible.Flamboyantly styled and expansively proportioned, the 2+2 was unbeatable for sheer presence. More 400cuin (6.6L) engines were produced by Pontiac than the other versions - estimates range from 80 to 200 units. The basic package included the heavy-duty suspension, with even stiffer springs and shocks available. Since the story of this 421 is better told in pictures, follow along as we take you on this exciting journey! Though never factory-installed in any car, the ultimate engine of the Ram Air line of engines was the tunnel-port Ram Air V. In 1969 Pontiac created four versions of the Ram Air V engine: a 303cuin (5.0L) short deck version for SCCA Trans-Am racing, a 366cuin (6.0L) variant for NASCAR, a 400cuin (6.6L) version for street use in GTOs and Firebirds, as well as a 428cuin (7.0L) adaptation for drag racing. Specs datasheet with technical data and performance data plus an analysis of the direct market competition of Pontiac Catalina Vista 421HO Trophy V-8 Tri-Power 4-speed in 1964 the model with 4-door hardtop sedan body and V-8 6902 cm3 / 421.2 cui, 276 kW / 375 PS / 370 hp (max) offered since October 1963 for North America U.S. special version. It was removed from the design for the 1960 model year because designers moved the generator and the power steering pump from atop the front of the engine down to the front of the heads to accommodate a lower hoodline. View the Pontiac Engine Torque Specifications for engine repairs and rebuilds. The 389 V8 was first introduced by Pontiac in 1959. With an identical bore and stroke of 4+116in (103.2mm) and 3+34in (95.3mm) it was precisely half the displacement of the 389 and shared numerous parts with the V8,[1] yet weighed considerably more than half as the engine lower half and block casting were not simply divided down the middle. 455 (7.5) Buick Gran Sport, and 455 (7.5) Oldsmobile 442). This engine was first offered in 1967 as the top engine option in full-size Pontiacs. A concave rear window, fender skirts, and ribbed die-cast lower body trim, augmented the Grand Prix's upscale appearance. Piston pins: Icon, SAE 1016 to 1022 Compression ratio was a modest 8.00:1, with valve diameters of 1.781in (45.2mm) (intake) and 1+12in (38mm) (exhaust). Pontiac Heads; Pontiac Engine Torque Specs; Pontiac Cars (Body Types) Pontiac Engine Information; Instruction Sheets; Compression Calculator; Ask a Tech Question; Customer Service. The 1979 Firebird model line was the last year for the Pontiac 400, and by this point not only was it required with the 4-speed manual transmission, it also required the WS6 Special Handling Package as mandatory equipment. It remained on the same platform, but for the 1966 models, it became a different Pontiac series. 1966: 421: 9782611 (late) 1967-1969. Besides a variety of displacements, the Pontiac V-8 block saw a number of other changes over the years, including starter locations, main-journal diameters, engine-mounting points, and . The engine build will be discussed in two parts. Offered from 1967 to 1969, it produced 360 and 376hp (268 and 280kW) in 1967, 375 and 390hp (280 and 291kW) in 1968 and 360,370 and 390hp (268,276 and 291kW) in 1969. 1965 Pontiac LeMans GTO Mecum. The crankshafts were also unique in the fact that they featured only two counter weights instead of the usual five and also featured lightened connecting rod journals. [19], Parts for Ram Air V engines are not readily available. It would later become known colloquially as the "Ram Air III", though Pontiac never called it by that name. cam specs out at 215/225-degrees duration at 0.050 and has just 0.407/0.407 lift with the factory 1.50:1 rockers. In 1969, Pontiac also used a revised crankshaft out of a Pearlitic malleable-iron, although it still used the "N" casting letter. For 1958 the V8's bore was increased again to 4+116in (103.2mm), increasing displacement to 369.4cuin (6.1L). Coil: GM NASCAR race cars embody the muscle car philosophy of power. Over the years he has amassed a library of data from investing in metallurgical testing with a well-respected laboratory. Head ID Location The 455 HO package was only available to late model year Pontiac Firebird Trans Am's, and was mandatory with a 4-speed transmission. or Best Offer. The main upgrade for the engine was the ESC, (Electronic Spark Control)[15] which provided slightly more power at 170hp (127kW) with 4.9L (299cuin) for the 19801981 model years. Engine Specifications. HPP decided to follow this exciting exercise; we show you the highlights in this two-part primer. This money bought a potent 389 V-8 with 267-283 bhp . Year. 1968 - 400 Ram Air II Round Port Code 96. The 1963 Catalina two-door sports sedan pictured here showcases the 421 H.O. Pontiac engine production records report that 190 XS-code 389 engines were built during the 1966 model year. This chart covers Pontiac V8 Engines; 265, 301, 326, 350, 389, 400, 421 . 1966: 421: 9782611 (late) 1967-1969. The 400 2-barrel kept the 17 degree valve angles for '67; starting in '68 all Pontiac V8s went to the 14 degree valve angle. The 1955-up Pontiac V8 that finally reached the public was an overhead valve engine with cast iron cylinder heads and block and wedge-shaped combustion chambers. The 400 HO was offered as an option for 1967-1970 for GTO and 1968-1970 for Firebird. For 1970 the Trans Am was the only Firebird available with the Ram Air IV, and 88 were produced during the abbreviated 1970 F-body production run. See profiles, photos, and specifications of, Muscle cars came in many shapes and sizes. The 1969 HO 350 HO was equipped with the 400cuin (6.6L)'s large valve heads (# 48's) and the 400 HO camshaft and rated at 330hp (246kW). The 2-barrel version was last offered in 1979. Timing chain: LPC, double rollerINDUCTION Well, gaze upon these numbersa 421ci Pontiac with Tri-Power carburetion. Deck Height: 10.215-in Pontiac offered this to the public as a streetable version of the 421 SD. The GTO came with a four-barrel 389 V8 with 335 horsepower. According to the engineers who worked on the project, the SOHC 421 engines produced around 625hp and were capable of turning 7,000 rpm. The goal of making a Pontiac Hemi succeeded but the engine was never produced. An evolution of the RA IV and H.O. Pontiac first offered three two-barrel carburetors in 1957 and the Tri-power set up was an option on the GTO from 1964-66. In the Firebird Ram Air induction for the 400 HO was a separate option for 1969(included with Trans Am) and included with the engine(optional in Formula; included with Trans Am) in 1970. It also sports the four-speed manual, limited . Some production test cars ran considerably slower and yielded 14-mile (402m) times in the 14.5 second/98mph (158km/h) range in showroom tune (uncited sources)- results that are quite consistent for a car with a curb weight of 3,850 pounds (1,746kg) and the rated 290hp (216kW) SAE NET figure that some sources suggest was "under-rated." Here are my top six rationales for admiring the 1966 GP. A Pontiac SD 421 came with forged steel rods and crankshafts for extra durability. Pontiac first offered the 2+2 as a Catalina engine, suspension, and trim group in 1964. Royal Pontiac developed the prototype of the package on their 1965 GTO drag car and Pontiac picked up the idea and in August 1965 Pontiac offered the new Fresh Air package to dealers consisting of the parts and instructions needed to make the hood scoop functional, including the metal tub to mount to the carburetors and rubber gasket to seal it to the underside of the hood. For 1956 the V8 was bored out to 3.9375in (100.01mm), increasing displacement to 316.6cuin (5.2L). In 1968, a 320hp (239kW) HO option was offered in the Tempest and Firebird. for 1980, and the 8th being a "T" for 1981). Math, not gasoline, makes horsepower under the hood of a Pontiac. But the "Ram Air" 400 also mandated steep 4.33:1 gears(or 3.90:1 in Firebird), making the Quadra-Power 400 (400 HO) the top practical street engine option for most drivers. . The Block Date Code represents the production date of the engine. Valve lift stayed at just over 0.400-inch with 1.5:1-ratio rocker arms. First offered as an option in 1963, the 421 HO came in a 4-barrel engine of 320hp (239kW) and one Tri-Power H-O version with a hotter cam and efficient iron exhaust manifolds and rated at 370hp (276kW). Super Duty 421s were back, tougher than ever. In 1973 a further refined and even stronger but less powerful version, the Super Duty (SD) engine, was planned for Firebird, Grand Am, Le Mans (GTO), and Grand Prix models. During 19511952, Pontiac had 23 287cuin (4.7L) V8-equipped 1953 model production prototypes running tests on the GM proving grounds. [9], The W72 engine was standard in all 1977 Pontiac Can Ams (bar the 1977 Can Ams sold in California/High Altitude states which received the L80 Oldsmobile 403) and was optional in all 1977-79 Pontiac Firebird Formula and Trans Am models. In 1967 the 421 was enlarged to 426.61cuin (7.0L) by increasing its bore to 4.12in (104.6mm). By 1949 work on a 287cuin (4.7L) OHV V8 had begun, but moved along slowly. 1966 Pontiac Catalina technical specifications and data. Preparation: File-fit for end gap if needed, wash In addition to the more refined cylinder heads, block casting reinforcements in the lifter galley and main bearing oil pan rail area, it had forged connecting rods with larger 716-inch-diameter (11mm) bolts. Returns; . Prices ranged from $2,760 to $3,220 . The W72 Performance Package also included an upgrade to the rear differential ratio, setting the rear gear ratio to 3.23 for all 1977 and 1979 W72 Firebirds, with the exception being 3.42 for 4-speed equipped W72 Firebirds in 1978 only.

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