302 with gt40p heads horsepower

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. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. 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. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. Because its all been done time after time after. 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Cant wait to try um out. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. 1.7 shaft rockers and beehives. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. 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. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. While the heads were off getting a massage, we turned our attention to the cam timing. Because of this, your tuneup will probably need to be modified. The tube headers showed a gain of almost 100 hp! 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. You can have your current 28 oz rebalanced to 50. These are Ford iron GT-40P heads. All costing in the end at least another $2k. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! This time around, we chose a shining example of this junkyard art form. Keywords When building an engine there is a lot to take into consideration. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. The Fora platform includes forum software by XenForo. Sponsored. 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. Boy, were we surprised with the results. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. In less than an hour, we were ready to test. Well that article just got me very ancy, I want these heads!! 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. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. 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? Yeah, except those. a) ain't early and b) aren't 289 heads. How much HP and torque do you think I. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. Gt40 heads/intake from a jy explorer, leave the . 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 . Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. never messed with the timing, its at 35* total . The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. The reason for this is that we're actually replacing mildly worked E7TE heads. 68 XR7 & 68 M-100. I must agree with Jeff Smith. How to Build a Budget 383 Stroker Chevy How do I Increase Horsepower on a 440 Cylinder Head Specifications for a 1969 How to Get More Power Out of a 92 4.3 dragster engine image by Robert Young from, Copyright 2023 Leaf Group Ltd. / Leaf Group Media. The GT40P heads flow a lot better than stock 351 heads. 1 - 7 of 7 Posts. E303 Cam advanced 4 degrees. Instructions on porting the GT-40p heads here. 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. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. You didnt mention which cam you had in mind. K.S. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. Took me 7 hours to do one head.but they cleaned up real nice. 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. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. 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. But don't think that adding a bigger camshaft will make more power. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Well also assume that this engine is running stock exhaust manifolds. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. Im a different animal. Holley 670 street avenger carb. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. 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. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. I turned it because it was tired when I got it. You gave me the info I was looking for, and I really do appreciate it. Like I said lots of options. JavaScript is disabled. These are some of the pictures I have showing the Explorer manifolds. I have a very good running stock 1981 302 in a F100 short box. 68stang351 Founding Member May 16, 2002 850 That's an improvement of 22 hp over Test 2. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I had a set of 69 302 heads I ran for a while . A forum community dedicated to Ford performance owners and enthusiasts. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Torque on the other hand isnt something to write home about. If they are cheap enough, take them anyway. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. We gained 45 hp and 40 lb-ft of torque. Your email address will not be published. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. A forum community dedicated to Ford Mustang owners and enthusiasts. . With. This is the main reason why these engines are not modified as much as the small block Chevy. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 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. It's a classic move we've pulled off many times. 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 the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Or, you could invest in a new set of heads that would also do the same job but you can expect to spend quite a bit more money. 69.90.139.244 The asterisk HP differences are calculated using Test 1's 294-hp peak. Motor is going into a Ranger. #1:::Throw out all your Magazines that suggest what to do! 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. fordfan289, Aug 27, 2011 Richard Rowe has been writing professionally since 2007, specializing in automotive topics. The "P" heads flow better. . 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! These heads have been remanufactured using refaced reclaimed Factory Valves. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. Ford Factory 5.0 Performance Cylinder Heads. We compare the GT40s to modern cylinder heads as well as other heads from the era. We need a build on a 400+ hp 302/6 build. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Joined . They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. 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. Step 2. Pretty sure that was name, but I could be wrong. JEGS High Performance. 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. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Choose a cylinder head before you install the pistons.

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