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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. Sponsored. This is needed for the steel roller cam. But don't think that adding a bigger camshaft will make more power. The hardest part of swapping the cam was just getting the timing cover off and back on again. Skip to main content. by travis Sun May 03, 2020 8:33 am. 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. Joined: Sun Mar 15, 2009 9:31 am. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. 1983 Mustang G.T. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Because of this, your tuneup will probably need to be modified. We've seen what happens from previous Ford experience when power levels above 500 hp tend to either pop head gaskets or saw blocks in half. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. 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. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Their weak point is that the rotator used on the exhaust valve is very thick. I've got gt40p heads for it I'll be running, and can't afford better . With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. Yeah, except those. a) ain't early and b) aren't 289 heads. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Thank You. 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. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Im a different animal. The gt40p head is considered the best OEM 302 head made. This engine will be good for your 65 Mustang. The only way to really make more power is to go with a stroker kit, blower and/or heads. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? No-option stripper- I like strippers. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. how hard to put on? $700.98. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Shop by category. 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 In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. 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. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Yes- thank you. We heated the bottle to 950 psi and hit the button at 4,500 rpm. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. The valve seats have been cut on a . Anythoughts? A good port job can set you back another $500-$1,000. He'll have to get a gear for his distributor. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. They also have emissions legal heads as well. Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! 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. Calculated compression to 9.8:1. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I love my setup and it is very strong engine. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? 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. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. It turned out we were conservative on both counts. #1:::Throw out all your Magazines that suggest what to do! What would be the best cam and springs to use for these heads in a 302 Windsor? But the part about a cam replacement possibly being a labor intensive undertaking is correct. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 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! 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. Maybe I'll think about a cam swap? 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. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! The Fora platform includes forum software by XenForo. It runs smooth but seems lazy. 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. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. ***Most important is theStupid question is the one that was never asked!*** Took me 7 hours to do one head.but they cleaned up real nice. Here is my setup. 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. You didnt mention which cam you had in mind. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. GT40P heads, what kind of performance do they give? 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. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. First, adding headers will improve power on the existing combination. Not sure how they would mate up to your existing exhuast, but otherwise they should work. 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. Using the manufacturer recommended springs for your camshaft are a safe bet. 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. 02-11-2012, 07:16 PM #6 fiveoh 86lx 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. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. For a better experience, please enable JavaScript in your browser before proceeding. No-option stripper- I like strippers. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. never messed with the timing, its at 35* total . I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Good on ya Jeff Smith. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. 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. 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. Learn how your comment data is processed. Torque on the other hand isnt something to write home about. 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. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. 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. Take the assembly to a machine shop to have it balanced and install it in the block. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. 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. I'm also have the regular GT40 heads on my current build. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. The heads that were used were also old C8 casting with 58cc chambers. A forum community dedicated to Ford Mustang owners and enthusiasts. JEGS High Performance. K.S. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. The tube headers showed a gain of almost 100 hp! I had those on my car before I upgraded and they were nice heads. at the crank. They work, but present their own challenges. Once the headers are in place, then you can consider if you still want more power. this is the price for one head. If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. I spin it to 6500 and thats about it. 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! 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. 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. 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. 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. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Compare. 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. JavaScript is disabled. Shop by category. Both swaps made more sense when parts were readily available at the bone yard for cheap. These engines came with the GT40P head, which even with its small valves, offers really good performance. There are caveats to this plan, however. Very true about finding them at the local yards. If I get different urges later, Ill pursue those then. 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. 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. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. I got lucky and found a complete Explorer GT40P engine online. As with all head installations, check piston-to-valve clearance before final startup. Its NA but makes use of AFR heads and some other aftermarket goodies. Without changing the stock pistons. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I have a very good running stock 1981 302 in a F100 short box. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . 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. 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. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. 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:?:!?!?!? Required fields are marked *. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. . That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 68 XR7 & 68 M-100. 69.90.139.244 HiPo manifolds and Ill be good. 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. 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. I have to agree, the GT40P heads flow better than the GT40 iron 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. Install a set of 1.7:1 roller-tipped rocker arms on the heads. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. LOW-BUCK 302 FORD HEAD UPGRADE Richard Holdener 239K subscribers 189K views 2 years ago WESTECH PERFORMANCE GROUP WHAT'S IT WORTH? Pretty sure that was name, but I could be wrong. Best of all, no machining is required to install these on your stock cast iron heads! There are a couple of reasons for this suggestion. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. We bolted the Ford to the dyno with a set of 158-inch long-tube headers and an 18-inch collector extension to help the low-speed torque, then we fired up the small-block. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. 69-70 302 heads (the ones with the heart-shaped combustion chamber) Any early 289 heads for the chamber size (but you'll have small ports & valves w/all that CR) Flat Ernie, Aug 27, 2011 SHARE POST #8 fordfan289 Member from indiana correct me if Im wrong but cant you use 351c heads and get the same thing as a 302 boss. Your IP: Cant wait to try um out. this head fits years 95-01 explorer mountaineer mercury mountaineer . Do you guys have part numbers for the spring kits? The combination of this cam with your intake and headers will produce a very nice street engine. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! Build Thread 1965 Fastback Project "Racesteed". Over $2050 for the 165/185 renegades. Thanks. The asterisk HP differences are calculated using Test 1's 294-hp peak. Along with the heads, we used MAC headers for GT-40P heads. Eldelbrocks Air Gap intake manifold should work well with the combination. You just want to keep it out of detonation. fordfan289, Aug 27, 2011 SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. While the heads were off getting a massage, we turned our attention to the cam timing. GT40s have 64cc chambers. - I have a 1989 f150 with a 302 5 spd. Runs well. 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. 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.