In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Install a set of 1.7:1 roller-tipped rocker arms on the heads. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. check out the. Test 3: Installed the larger Lunati camagain, no other changes. JavaScript is disabled. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. 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. We know what you're thinking--only two-tenths from an extra 45 hp? many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . Once you get into the FoMoCo aftermarket aluminum GT40s though, all bets are off. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. Over $2050 for the 165/185 renegades. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. Be careful, I was once bitten by one of those reptile engine builders. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . The Fora platform includes forum software by XenForo. 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. 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. The hardest part of swapping the cam was just getting the timing cover off and back on again. Here is my setup. The later model distributors had a different diameter shaft than the earlier ones. These engines came with the GT40P head, which even with its small valves, offers really good performance. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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! 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. 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. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. I have a very good running stock 1981 302 in a F100 short box. 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. Anyways, I know the gt40ps will bump . Would have liked to see a comparison done on the same short block using a set of decently-ported early non-Thermactor iron heads Tracy Blackford, 65 Mustang FB, 331 built with 289 H beam rods and 383W piston, 282S cam, self ported '70 351w heads, Dougs Tri-Y headers. Shop by category. K.S. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. 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. All this is worth it. Then why did you port the heads and how do you know if you made an improvement. 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. never messed with the timing, its at 35* total . HiPo manifolds and Ill be good. 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. Free shipping for many products! Over $2050 for the 165/185 renegades. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Their weak point is that the rotator used on the exhaust valve is very thick. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . This will keep you from dropping your overall static compression ratio and losing power. that is a healthy budget deal. Ha! 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. JavaScript is disabled. That's an improvement of 22 hp over Test 2. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! just curious. Im a different animal. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. No-option stripper- I like strippers. Have fun, be safe, enjoy. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. A COMP hydraulic roller cam we found works well with this combination. 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. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. Click to reveal If I get different urges later, Ill pursue those then. Keywords This engine will be good for your 65 Mustang. Required fields are marked *. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. For a better experience, please enable JavaScript in your browser before proceeding. Obviously, tuneups will vary. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Yep my **** is coming apart again Isnt life great! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. SBF engines are modified constantly. $700.98. Check my post above. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. 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. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. Adding the headers may also require a slight increase in secondary (and possibly primary) jetting to ensure the proper air-fuel ratio, but thats also an easy tuning change. Skip to main content. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. 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. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Do not ever, ever think about using the tube type manifolds. 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. 1983 Mustang G.T. 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. 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. 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. There are a couple of reasons for this suggestion. Even with a stock Mustang 5.0 cam makes good power. I have to agree, the GT40P heads flow better than the GT40 iron heads. are you twisted331 also? 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. The car weighs #2835 with driver. 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. 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. 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. Calculated compression to 9.8:1. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. 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. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Performance & security by Cloudflare. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. Along with the heads, we used MAC headers for GT-40P heads. No-option stripper- I like strippers. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. He'd be the best source. I just read about this build on the corral.net. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. Build Thread 1965 Fastback Project "Racesteed". Im now thinking of adding a cam to match the carb. 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. T5 with 3.73s. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. I love my setup and it is very strong engine. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. I had a set of 69 302 heads I ran for a while . Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . GT40, GT40P, would be great factory heads. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. What did the heads flow? A forum community dedicated to Ford Mustang owners and enthusiasts. 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. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . At 4,300 rpm, the torque peaked at 348 lb-ft, a solid 20-lb-ft improvement, and the Lunati continued to outperform the stock cam all the way through with a peak horsepower increase of 60 hp at 354 hp at 5,700 rpm! If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Compare. . Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. For a better experience, please enable JavaScript in your browser before proceeding. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. That's more than enough to feed a power-brake booster. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. You can have your current 28 oz rebalanced to 50. 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. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. 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. how hard to put on? Weiand 7515 xcellerator intake. There are too many variables to add to this regarding aftermarket stroker kits or components. Instructions on porting the GT-40p heads here. Yea. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. But don't think that adding a bigger camshaft will make more power. Holten runs the factory fan, but he had removed it when he ran the 12.63. This will cost additional money but is still worth it, in our opinion. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. Not sure how they would mate up to your existing exhuast, but otherwise they should work. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Slover primarily focused on the exhaust side of the GT40P heads. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. I got lucky and found a complete Explorer GT40P engine online. ***Most important is theStupid question is the one that was never asked!*** Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. The kit offers adjustable power from 50 to 250 hp with a simple jet change. Torque on the other hand isnt something to write home about. Joined: Sun Mar 15, 2009 9:31 am. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Pretty sure that was name, but I could be wrong. Pride is built, in your garage, with your two hands. 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. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. this is the price for one head. These timeslips are from 1280' above sea level. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. 69.90.139.244 The gt40p head is considered the best OEM 302 head made. 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. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Overview. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. You can use the stock roller lifters with any size cam you want. Ford offered a performance head that was a stock part on 1993-1995 Mustang Cobra models and pre- 1997-1/2 Ford Explorers and Mercury Mountaineers equipped with the 5.0 L engine called the GT-40 head (casting ID F3ZE-AA). There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. 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. Ported Hurricane Single Plane and custom 750 HP. For a better experience, please enable JavaScript in your browser before proceeding. The GT40 heads are a bit more versatile, working with the 5.4 and 6.8, while the GT40P (Explorer/Mountaineer) heads will only work on the 6.8 due to an interference issue. 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. Let us explain. The 5.0L with the GT40 head had a 9.0:1 compression, and the 5.0L with the GT40P head had 9.1:1 compression. Well also assume that this engine is running stock exhaust manifolds. 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. For a better experience, please enable JavaScript in your browser before proceeding. $930.00 + $55.00 shipping. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. 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. 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. However there are plenty of factory heads that with the help of an experienced machine shop can be great. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Motor is going into a Ranger. Here a comparison of different heads on a 302: I'm very happy with my GT40P. Buy the lifters for peace of mind now and hopefully for the duration. The GT40P heads flow a lot better than stock 351 heads. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Anythoughts? 1986 Short block with notched pistons. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. 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. (its not their engine) Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. 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. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. 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. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. HAD '82 GT monochromatic (red).black cloth HAVE 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 have a 432 HP non Hi Po 289 I built. On slicks the car went some low 7.70s right at 90mph. E303 Cam advanced 4 degrees. A trip to Orlando Speed World provided us with updated quarter-mile times. They work, but present their own challenges. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. We gained 45 hp and 40 lb-ft of torque. Ill do springs and a moderate cam and go for a good, dependable power plant. 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. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. If they are cheap enough, take them anyway. You could run a thinner head gasket as well. We compare the GT40s to modern cylinder heads as well as other heads from the era. 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. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. We heated the bottle to 950 psi and hit the button at 4,500 rpm. GT40s have 64cc chambers. 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

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