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Your IP: A good port job can set you back another $500-$1,000. GT40s have 64cc chambers. If you dont feel comfortable doing this higher a pro. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. A mild porting with gasket matching will be very good. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. The reply has so many assumptions that I cant even assume to know the answer. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. The tube headers showed a gain of almost 100 hp! P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. 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. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. You didnt mention which cam you had in mind. On slicks the car went some low 7.70s right at 90mph. We need a build on a 400+ hp 302/6 build. 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. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. The heads that were used were also old C8 casting with 58cc chambers. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. just curious. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . An aggressive cam will wake it up a bit. Maybe I'll think about a cam swap? The combination of this cam with your intake and headers will produce a very nice street engine. The action you just performed triggered the security solution. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. Thanks for the help, I was planning on puttingin roller rockers or at least new springs, and that engine looks great, hoppfully mine will look at least similar to that one of these days. This will keep you from dropping your overall static compression ratio and losing power. This is the main reason why these engines are not modified as much as the small block Chevy. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. 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. For a better experience, please enable JavaScript in your browser before proceeding. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? Build Thread 1965 Fastback Project "Racesteed". This is not a criticism but instead consider it to be more of a heads-up. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Well offer one as an example. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. This is needed for the steel roller cam. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Really hurt too. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Shop by category. 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. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. Ive been building ENGINES for 40+ years. There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. Do you guys have part numbers for the spring kits? Joined . The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. One benefit gt40P head will have over other 80's-90's model heads, including the gt40 head, is that it has a smaller combustion chamber much like the original 289 heads. That's fantastic for the minimal investment we made. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. 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. Not sure how they would mate up to your existing exhuast, but otherwise they should work. Slover primarily focused on the exhaust side of the GT40P heads. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Cloudflare Ray ID: 7a2e2d95dedea1e4 For real performance, stock E7TE heads leave a lot to be desired. The hardest part of swapping the cam was just getting the timing cover off and back on again. I would like to know what heads, cam and intake manifold combination to use for the most HP I can squeeze out of that motor. What did the heads flow? Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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 got lucky and found a complete Explorer GT40P engine online. Long tube headers are a terrific idea, but you need to open up the exhaust side. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. #1:::Throw out all your Magazines that suggest what to do! A forum community dedicated to Ford Mustang owners and enthusiasts. Weiand 7515 xcellerator intake. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. i'd love to use these heads,. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Test 3: Installed the larger Lunati camagain, no other changes. For all of us interested in Gt40p heads. The Fora platform includes forum software by XenForo. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. However I think the opportunity window is slowly closing. Scorpion 1.6 roller rockers. T5z and 3.89 9" TL rear. Not *as* good as the GT40p heads, but I'd prefer to not have to worry about exhaust fitment issues, or have a narrow range of what I can work with. At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. Im running stock GT40 heads with stock 4.000 bore on cylinders and a Lunati cam with 256/262; Duration @ .050 (Int/Exh): 213/219; Gross Valve Lift (Int/Exh): .483/.499; LSA/ICL: 112/108. Instructions on porting the GT-40p heads here. When compared to the new generation of performance engines on the market today like the 5.0L DOHC Coyote engine, your engine will not come close. So . I got lucky and found a complete Explorer GT40P engine online. Along with the heads, we used MAC headers for GT-40P heads. Just got through porting one of my gt40p heads today. If the head bolt holes are 1/2" or slightly larger, ARP makes the washers and can be sourced from Ford Racing or ARP through a speed shop or Summit, Jegs and PAW among others. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. A forum community dedicated to Ford performance owners and enthusiasts. Im new and Im 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. Stock valve sizes? i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. I had a set of 69 302 heads I ran for a while . Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. You just want to keep it out of detonation. Free shipping. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. how hard to put on? Take the assembly to a machine shop to have it balanced and install it in the block. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Motor is going into a Ranger. 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. As usual, there is much more to this story. Through Central Coast you can have the heads fully prepped for your combination. This engine will be good for your 65 Mustang. You'll have to plug the oil hole that is in the engine from the old oil dipstick. You can use the stock roller lifters with any size cam you want. Jeff Smith: It would have been better to know a little bit more about your combination, but the short answer is yeswith a hydraulic roller camshaft, assuming the lifters are in good shape and the roller wheels show no unusual wear, they can be re-used on a new cam with no danger of adverse effects. (its not their engine) And remember ENGINES have been being built/rebuilt/modified for years. As you might expect with more duration, the idle quality dropped significantly but was still able to make 11.5 inches of vacuum at 980 rpm. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Many years ago, a friend bought a used 2001 Mercury Mountaineer 5.0L that was equipped with a set of really decent GT40P style iron heads. this is the price for one head. However there are plenty of factory heads that with the help of an experienced machine shop can be great. I have a very good running stock 1981 302 in a F100 short box. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 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. Paying a premium for a set of GT40P heads or dumping money into some to get their performance to rival aftermarket is not for me. 02-11-2012, 07:16 PM #6 fiveoh 86lx Just make sure it is a roller cam. PTP Engineering front suspension and 25540R17s all around. Every thing he tells you on this site is true. Keep in mind that swapping camshafts is a fairly extensive effort. I added a link to it. Not looking for crazy HP. 68stang351 Founding Member May 16, 2002 850 Most all long tubes come out far enough to clear and other short tube headers will work but there is clearance issues on two of the cylinders. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Win or lose, if you buy the ticket you must take the ride. This time around, we chose a shining example of this junkyard art form. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD.