This engine will be good for your 65 Mustang. I love my setup and it is very strong engine. Be careful, I was once bitten by one of those reptile engine builders. In an effort to preserve the history of the Early Fox Era, FEP covers the following vehicles: 79-86 Mustang and Capri, 84-86 Mustang SVO, 78-83 Fairmont & Zephyr, 83-86 LTD & Marquis, 80-88 Thunderbird & Cougar, 82-87 Continental, 84-92 Mark VII, 81-82 Granada. We've already been motivated to put this engine in a buddy's Mustang. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. at the crank. Then why did you port the heads and how do you know if you made an improvement. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! 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. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Very true about finding them at the local yards. Also, the spark plug angle makes it a pain. We need a build on a 400+ hp 302/6 build. Well assume it is a 5.0L with stock heads. i'd love to use these heads,. I just read about this build on the corral.net. Sponsored. HiPo manifolds and Ill be good. 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. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - anyone have experience with GT40P heads on a 92 351W - ive got a 92 F250 with a 351W that needs a pretty serious rebuild. And have discovered something that I dont think anyone else knows. Ford Factory 5.0 Performance Cylinder Heads. Take the assembly to a machine shop to have it balanced and install it in the block. HAD '82 GT monochromatic (red).black cloth HAVE Here is my setup. I had a set of 69 302 heads I ran for a while . Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. Long tube headers are a terrific idea, but you need to open up the exhaust side. . They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Posted on May 07, 2014 by promarengine. Even with a stock Mustang 5.0 cam makes good power. I am working on a set of iron GT40s hoping it goes faster. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. The reply has so many assumptions that I cant even assume to know the answer. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. 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. Never not once have I ever seen a SBF rod bolt create a failure. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. There are too many variables to add to this regarding aftermarket stroker kits or components. These timeslips are from 1280' above sea level. With no other changes we gained 25 hp using factory iron heads. THANKS VERY MUCH! 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. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Here a comparison of different heads on a 302: I'm very happy with my GT40P. PTP Engineering front suspension and 25540R17s all around. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. 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. people can stop saying that adding aftermarket cam with stock heads is a waste of time. JavaScript is disabled. Joined . Both swaps made more sense when parts were readily available at the bone yard for cheap. 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. Depends on the budget. Over $2050 for the 165/185 renegades. 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. 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. Limited header choice is certainly a challenge. JavaScript is disabled. There is a better way. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. Mar 23, 2004. Holten runs the factory fan, but he had removed it when he ran the 12.63. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. that is a healthy budget deal. The results were a major increase in power throughout the entire rev range, with an increase of 60hp at 4500rpm through to a peak of 279hp at 5800rpm. Anyways, I know the gt40ps will bump . If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. There are a couple of reasons for this suggestion. There's not a lot of reson to use 351 heads later than '75 since they essentially identical to 302 heads except for head bolt holes. 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. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. If you know him, ask him. Step 1. Some ideas never go out of style. 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! We then dyno'd the car without the fan to get some consistency and were rewarded with a peak of 316 hp at 5,500 rpm, and 348 lb-ft of torque at 4,000 rpm. Runs well. K.S. Through Central Coast you can have the heads fully prepped for your combination. Well that article just got me very ancy, I want 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? FULL DYNO RESULTS. 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. At the dragstrip, we gained two-tenths and 2 mph. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. Your IP: Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. Everything fits, use the stock rockers and pushrods. by travis Sun May 03, 2020 8:33 am. Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. First, adding headers will improve power on the existing combination. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. The spark plug issue is almost a non-issue. Pretty sure that was name, but I could be wrong. I got a GT40P off the assembly line years ago. For a better experience, please enable JavaScript in your browser before proceeding. Hey all, I'm working on building a 302 with my gt40p heads. +1 I would go with the regular GT40 heads. Shop by category. Stock 1989 5.0L HO pistons will work if you can find them. A forum community dedicated to Ford performance owners and enthusiasts. Because of this, your tuneup will probably need to be modified. 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. This is needed for the steel roller cam. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. 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. 97% Positive Feedback . You didnt mention which cam you had in mind. Compare. I'm 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. are you twisted331 also? 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. GT40, GT40P, would be great factory heads. I added a link to it. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. This is not a criticism but instead consider it to be more of a heads-up. I don't need tons of power to enjoy the car. Not to mention, they will run circles around GT40P's out of the box. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Eldelbrocks Air Gap intake manifold should work well with the combination. The only one that's close, is #7. Its increase while significant is still only about that of a decent 351 w, hi im building a nastalgic car so im not going to drag race it but it must go ok ive got a 302 windsor basicly recoed stock but i want to run tunnel rams to go with the the3am would like to put choppy cam and replace the heads any ideas would be much apprecited thankyou, What is the stock head cc of a 1992 f150 302 windsor. #1:::Throw out all your Magazines that suggest what to do! Calculating pushrod length They also have emissions legal heads as well. I spin it to 6500 and thats about it. Ive been building ENGINES for 40+ years. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . The heads that were used were also old C8 casting with 58cc chambers. 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. 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. 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.

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