302 with gt40p heads horsepower
If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Because of this, your tuneup will probably need to be modified. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. This is what I recommend to everyone who is doing a budget 5.0 build. What did the heads flow? I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. For real performance, stock E7TE heads leave a lot to be desired. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. Free shipping for many products! Manual trans. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. Just put some 1.7 pedistal rocker arm on along with a mild camshaft (make sure to use the correct valve springs), you will make over 300 flywheel hp. JavaScript is disabled. Definitely going to use my P heads. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. However, since Holten's car has an E303 cam, we didn't want the pistons and valves becoming too close, so we chose the 1.6 rockers. The kit offers adjustable power from 50 to 250 hp with a simple jet change. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. There are caveats to this plan, however. Free shipping. Maybe I'll think about a cam swap? The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. check out the. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. If you're running a stock cam, 1.7 rockers will work perfectly. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. On slicks the car went some low 7.70s right at 90mph. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. Step 2. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. Well also assume that this engine is running stock exhaust manifolds. 1983 Mustang G.T. Install a set of GT-40P cylinder heads from a late 1990's Ford Explorer or a set of GT40 heads from an early 1990's Mustang 5.0L. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. An aggressive cam will wake it up a bit. Here is my setup. We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. Aftermarket headers, such as those made by Hooker, BBK and Competition Engineering, are better and are just as easy, if somewhat more expensive, to procure used. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. For those of you running a carb, or aftermarket intake, you already have a leg up in this area and should see even greater gains in power. For all of us interested in Gt40p heads. As a matter of fact, Central Coast has an '89 coupe with GT-40P heads that has run a best of 11.98 in the quarter-mile. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. When combined with modern power-makers, such as nitrous, the 302 is more than capable of producing 400+ horsepower for little more than the cost of a stock engine rebuild. These heads have been remanufactured using refaced reclaimed Factory Valves. I have to agree, the GT40P heads flow better than the GT40 iron heads. A forum community dedicated to Ford Mustang owners and enthusiasts. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. In order to make Coyote-type power you will need some expensive, high-flow cylinder heads with a short block that can withstand spinning in excess of 6,500 rpm. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Holley 670 street avenger carb. Then why did you port the heads and how do you know if you made an improvement. This is needed for the steel roller cam. The reason for this is that we're actually replacing mildly worked E7TE heads. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Yep my **** is coming apart again Isnt life great! 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 68stang351 Founding Member May 16, 2002 850 All costing in the end at least another $2k. I have a very good running stock 1981 302 in a F100 short box. Weiand 7515 xcellerator intake. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. This website is using a security service to protect itself from online attacks. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. We decided on a Powerstar kit from Nitrous Supply, owned by our good friend Mike Thermos, who was one of the original nitrous kit suppliers back in the early '80s. That's a good combo in my book. Well offer one as an example. Purchase a set of flat top pistons (from Ford Motorsport, TRW or Keith Black) with machined valve reliefs and designed to provide 10:1 compression with a 59 to 60 cc combustion chamber cylinder head. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! A mild porting with gasket matching will be very good. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. this head fits years 95-01 explorer mountaineer mercury mountaineer . Not to mention, they will run circles around GT40P's out of the box. Related Resources Mustang Generation Nicknames: What Do They Mean? You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. I had a set of 69 302 heads I ran for a while . I've not seen a set of longtubes that have an issue with GT40P's, either. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Instructions on porting the GT-40p heads here. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Finding Gt40p heads at the junkyard is getting more and more complicated and if you want to upgrade the heads you have to take into account the costs of the machine shop and compare everything to a set of cheap aluminum heads. Holten's best time is a 12.63 at 105.9 mph, and if we gain the desired result he will be right in the thick of things in Trophy Stock competition. I'm new and I'm currently building a 302 on a budget and want to raise compression without milling heads but by pistons and I want to get close to 10:1. I must agree with Jeff Smith. Well assume it is a 5.0L with stock heads. The Fora platform includes forum software by XenForo. Limited header choice is certainly a challenge. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. We decided to test both ideas, so we ordered two roller cams from Lunati: a shorter-duration cam that would deliver decent idle vacuum and maybe make around 320 to 335 hp, and a longer-duration version that might push the horsepower up to perhaps 350 hp. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. These engines came with the GT40P head, which even with its small valves, offers really good performance. For the most part 302 heads and 351W heads are the same. Without changing the stock pistons. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . We gained 45 hp and 40 lb-ft of torque. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. That's fantastic for the minimal investment we made. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Pride is built, in your garage, with your two hands. Even with a stock Mustang 5.0 cam makes good power. Or just play it safe and let the fans ask away about another daring 5.0 TB bolt on or for an exciting surprise, do a LS______ fill in the blanks. E303 Cam advanced 4 degrees. All this is worth it. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. people can stop saying that adding aftermarket cam with stock heads is a waste of time. fuel injection system . 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. Long tube headers are a terrific idea, but you need to open up the exhaust side. - I have a 1989 f150 with a 302 5 spd. As a final goal, we decided to bolt on a simple nitrous system and see if we could push this little small-block Ford to make some real power. You can email the site owner to let them know you were blocked. The SUV indicated barely 120,000 on the clock, and after yanking the valve covers to judge the engine's condition, Tim Moore instantly made the decision to do the boneyard version of a smash-and-grab. The "P" heads flow better. No-option stripper- I like strippers. Tim's junkyard refugee survived the beating and we had a bitchin' story. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . The Fora platform includes forum software by XenForo. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. SBF engines are modified constantly. the springs are new stock oem ford. Using the manufacturer recommended springs for your camshaft are a safe bet. If you're not a header kind of guy, the repro 289 HIPO manifolds bolt up to the GT40P heads with plenty of spark plug room. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. The tube headers showed a gain of almost 100 hp! Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. GT40P heads, what kind of performance do they give? Test 3: Installed the larger Lunati camagain, no other changes. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! But dont think that adding a bigger camshaft will make more power. Yea. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. First, adding headers will improve power on the existing combination. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. I have a 5.0 from a 1992 Mustang in my 65. I was looking at putting on the GT40P heads on. The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. Hey all, I'm working on building a 302 with my gt40p heads. Stock 1989 5.0L HO pistons will work if you can find them. Good on ya Jeff Smith. Theres many options available for a little more power. However I think the opportunity window is slowly closing. The MPH was there to run a little better but the local track is about terrible. They almost seem like flywheel numbers rather than RWHP numbers. Go for it if you get them super cheap and can get headers/manifolds super cheap as well but otherwise I'd say it's a waste of time and money. There is a better way. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. The GT40 and GT40P cylinder heads are highly sought after, but how do they stack up against other cylinder heads, and is it worth it to upgrade the Fox Body's stock heads? Took me 7 hours to do one head.but they cleaned up real nice. The combination of this cam with your intake and headers will produce a very nice street engine. Joined: Sun Mar 15, 2009 9:31 am. AFR 165cc 58cc Heads. . Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. The only failures Ive had were timing chains and a couple broken rods in a mid 80s 302 with 200,000 miles on it that got about 35 lbs of boost stuffed into it when a pop off valve I bought on ebay failed. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. That's more than enough to feed a power-brake booster. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Scorpion 1.6 roller rockers. http://vb.foureyedpride.com/showthread.php?t=89153, http://www.facebook.com/groups/233213650060739/, ascMcLaren & Motorsport/Grand Prix IV Capris, RHD and Other International/Export Models, Mods, Maintenance & Mechanical FAQs/Archive, If this is your first visit, be sure to Calculated compression to 9.8:1. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. Both swaps made more sense when parts were readily available at the bone yard for cheap. Yeah, except those. a) ain't early and b) aren't 289 heads. Ford Factory 5.0 Performance Cylinder Heads. Aside from the cost of the nitrous itself, this setup should cost you little more than a stock rebuild using all brand new parts. Just got through porting one of my gt40p heads today. $139.99. at the crank. Similar to regular GT-40 heads, the biggest difference between the two is that the P-heads feature a revised spark plug angle which extends the plug into the combustion chamber, putting the flame front close to the absolute center of the chamber, resulting in a smoother combustion process. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Yank a motor out of the junkyard, clean it up, add a camshaft, intake, and a carburetor, and see how much power we can squeeze out of it. Yes- thank you. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. As with all head installations, check piston-to-valve clearance before final startup. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. (Please note these are not GT40P Explorer heads). This is the main reason why these engines are not modified as much as the small block Chevy. In review, we rescued a used 5.0L Ford from the boneyard, ported the heads, added a cam, carburetor, intake manifold, and headers, and pulled an amazing 376 hp out of the mix. Compare. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Finally, we exchanged the Explorer's EFI manifold (which is a pretty good manifold in its own right) for an Edelbrock Performer RPM Air Gap intake and a Holley 750-cfm HP-style carburetor. Obviously, tuneups will vary. The Fora platform includes forum software by XenForo. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. For additional insurance, we also added a set of ARP head studs, which are stronger and offer better thread overlap than factory bolts, which helps prevent pulling threads out of a used block. The Fora platform includes forum software by XenForo. Their weak point is that the rotator used on the exhaust valve is very thick. When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. are you twisted331 also? #3::: Do your homework,get quality parts,dont skimp. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. Install a set of 1.7:1 roller-tipped rocker arms on the heads. +1 I would go with the regular GT40 heads. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. Holten runs the factory fan, but he had removed it when he ran the 12.63. Part of this reason is due to its inherent strength and simplicity, but a lot of it has to do with how little Ford has changed it over the years. 1983 Mustang G.T. . I need that part number too! The best thing to do would be to use a specific break-in oil for the first 200 to 300 miles of use to reduce the change of a potential problem with undue wear. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. In less than an hour, we were ready to test. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. I'll save the effort and lighten my front end by 50# with aluminum. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Im now thinking of adding a cam to match the carb. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. For a better experience, please enable JavaScript in your browser before proceeding. The later model distributors had a different diameter shaft than the earlier ones. Ill do springs and a moderate cam and go for a good, dependable power plant. If you dont feel comfortable doing this higher a pro. We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. You can use the stock roller lifters with any size cam you want. just curious. Step 1. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. You should be able to get away with a 150 to 200 horsepower shot later, but it's best to start out small and work up. Dec 8, 2011. We also discovered some issues with the GT40P heads that required changes, so we added valves from Manley that eliminated the exhaust-valve rotators and allowed us to set the proper valvespring installed height. Depending on the Headers you have you might be okay. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. Free shipping. For a better experience, please enable JavaScript in your browser before proceeding. Those are really good numbers. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. While the heads were off getting a massage, we turned our attention to the cam timing. Take the assembly to a machine shop to have it balanced and install it in the block. I had those on my car before I upgraded and they were nice heads. I ran the Speed Pro L2488 pistons and it had me around 9.9 compression with a .041 head gasket, Now I had GT40 heads milled .020 and so that's just a guess on the CC. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Location: Re: Stock Ford 351W 4bbl dyno numbers. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? HAD '82 GT monochromatic (red).black cloth HAVE