302 with gt40p heads horsepower

The reason for this is that we're actually replacing mildly worked E7TE heads. Car Craft mag. I am very happy too. Slover primarily focused on the exhaust side of the GT40P heads. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. gt40p headers | Maverick/Comet Forums I have a very good running stock 1981 302 in a F100 short box. But don't think that adding a bigger camshaft will make more power. Related Resources Mustang Generation Nicknames: What Do They Mean? Ive been building ENGINES for 40+ years. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. That's a good combo in my book. I don't need tons of power to enjoy the car. The MPH was there to run a little better but the local track is about terrible. A mild porting with gasket matching will be very good. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . The Fora platform includes forum software by XenForo. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. First, adding headers will improve power on the existing combination. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. 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. GT40s have 64cc chambers. 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. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. Not sure how they would mate up to your existing exhuast, but otherwise they should work. Nice to see actual dyno results instead of "butt dyno" guesses. Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. When building an engine there is a lot to take into consideration. On slicks the car went some low 7.70s right at 90mph. They also have emissions legal heads as well. 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. Posted on May 07, 2014 by promarengine. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. The GT40P heads flow a lot better than stock 351 heads. If I get different urges later, Ill pursue those then. 68 XR7 & 68 M-100. 351W with GT40P heads? | Mercury Cougar Owners You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Ive bought wrecking yard SBFs and put 20 lbs of boost to them and spin them to 7000 and made 500 HP with several of them. 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. Compare. For 2018, the Coyote makes 460 hp. 302 GT40 Dyno Results - FourEyedPride.com Here is the lowdown on exhaust manifolds and VALVE SPRINGS. 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. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. Install a set of 1.7:1 roller-tipped rocker arms on the heads. We've already been motivated to put this engine in a buddy's Mustang. T5z and 3.89 9" TL rear. I must agree with Jeff Smith. 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. Both swaps made more sense when parts were readily available at the bone yard for cheap. 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. 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. Depending on the Headers you have you might be okay. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. Manual trans. any input is apprecciated:smartass: Thank you for the info, if all I have to worry about is the plugs then I'm in good shape hahaha. 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. Using the manufacturer recommended springs for your camshaft are a safe bet. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Maybe I'll think about a cam swap? What you are trying to do is to increase the amount of airflow through the engine in order to make more power. Once the headers are in place, then you can consider if you still want more power. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. You keep stock drivability, and stock gas milage if you can stay out of boost. thats after 3 hours of idling/midrange hits to tune the idle and part throttle . Without changing the stock pistons. I love my setup and it is very strong engine. GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend Keywords In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. Really hurt too. made more power everytwhere and 40 hp is respectable. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. You'll have to plug the oil hole that is in the engine from the old oil dipstick. JavaScript is disabled. That said there are some better aftermarket options for heads also. You just want to keep it out of detonation. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. Buy the lifters for peace of mind now and hopefully for the duration. Skip to main content. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. But the part about a cam replacement possibly being a labor intensive undertaking is correct. Install a set of 1.7:1 roller-tipped rocker arms on the heads. A LOT of them do it these days. The later model distributors had a different diameter shaft than the earlier ones. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. Check my post above. Test 3: Installed the larger Lunati camagain, no other changes. Stock Ford 351W 4bbl dyno numbers - Don Terrill's Speed-Talk Then why did you port the heads and how do you know if you made an improvement. +1 I would go with the regular GT40 heads. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Tim's junkyard refugee survived the beating and we had a bitchin' story. All this is worth it. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. ***Most important is theStupid question is the one that was never asked!*** This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. Yea. That's fantastic for the minimal investment we made. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Finally, we exchanged the Explorer's EFI manifold (which is a pretty good manifold in its own right) for an Edelbrock Performer RPM Air Gap intake and a Holley 750-cfm HP-style carburetor. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. Generally expect with a good cam, intake, roller rockers and a good ignition system to see around 300-350 max rear wheel horsepower, depending on what type of dyno you use. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. For all of us interested in Gt40p heads. It turned out we were conservative on both counts. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. For a better experience, please enable JavaScript in your browser before proceeding. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Instructions on porting the GT-40p heads here. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. He'd be the best source. I have to agree, the GT40P heads flow better than the GT40 iron heads. Let us explain. 302 with GT40 heads | Ford Mustang Forums 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. These engines came with the GT40P head, which even with its small valves, offers really good performance. The Fora platform includes forum software by XenForo. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! GT40Ps have 58cc. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. 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 gained 45 hp and 40 lb-ft of torque. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. gt40p heads on a 289 in a 66 | Vintage Mustang Forums i'd love to use these heads,. 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. 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. Choose a cylinder head before you install the pistons. We took the heads to Mike Slover of Slover's Porting Service in Sun Valley, California, to do this work, plus some basic pocket-porting to improve flowespecially on the exhaust side. Stock 1989 5.0L HO pistons will work if you can find them. I got a set of AFR heads , night and day. Mar 23, 2004. This will keep you from dropping your overall static compression ratio and losing power. Cant wait to try um out. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. The heads that were used were also old C8 casting with 58cc chambers. Also, the spark plug angle makes it a pain. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Well also assume that this engine is running stock exhaust manifolds. We compare the GT40s to modern cylinder heads as well as other heads from the era. 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. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. For real performance, stock E7TE heads leave a lot to be desired. fuel injection system . 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. With no other changes we gained 25 hp using factory iron heads. JavaScript is disabled. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Its always refreshing to see a FORD getting a little face time in your column, even if its a tired 302 with no great expectations of setting the world on fire when the dust settles. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. It's a classic move we've pulled off many times. Im now thinking of adding a cam to match the carb. They fill that spot between power and budget. Ha! GT40, GT40P, would be great factory heads. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. For the most part 302 heads and 351W heads are the same. 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. Gt40 heads/intake from a jy explorer, leave the . 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. Hey all, I'm working on building a 302 with my gt40p heads. Boy, were we surprised with the results. 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. Nudge us with emails, and we'll make it happen. 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). Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. 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? 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 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. As a final goal, we decided to bolt on a simple nitrous system and see if we could push this little small-block Ford to make some real power. Never not once have I ever seen a SBF rod bolt create a failure. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. JEGS High Performance. This will cost additional money but is still worth it, in our opinion. The Fora platform includes forum software by XenForo. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Along with the heads, we used MAC headers for GT-40P heads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Mac and Ford Motorsport both make a GT40P spacific header. Shop by category. check out the. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Calculating pushrod length The asterisk HP differences are calculated using Test 1's 294-hp peak. Learn how your comment data is processed. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. A bit of info for those looking to build 300+hp 5.0L/302s We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. The action you just performed triggered the security solution. 69.90.139.244 A forum community dedicated to Ford Mustang owners and enthusiasts. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. 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. Take the assembly to a machine shop to have it balanced and install it in the block. These timeslips are from 1280' above sea level. We heated the bottle to 950 psi and hit the button at 4,500 rpm. Compare. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. 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. K.S. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts 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. Be careful, I was once bitten by one of those reptile engine builders. Free shipping. Weiand 7515 xcellerator intake. No-option stripper- I like strippers. Cloudflare Ray ID: 7a2e2d95dedea1e4 You gave me the info I was looking for, and I really do appreciate it. 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. So . I have a 432 HP non Hi Po 289 I built. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. However there are plenty of factory heads that with the help of an experienced machine shop can be great. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. I'll save the effort and lighten my front end by 50# with aluminum. I'm also have the regular GT40 heads on my current build. Mild Build Gt40p 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. Shop by category. Well that article just got me very ancy, I want these heads!! As usual, there is much more to this story. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Assorted screwdrivers, pliers and vise-grips. If you're running a stock cam, 1.7 rockers will work perfectly. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. For a better experience, please enable JavaScript in your browser before proceeding. You can have your current 28 oz rebalanced to 50. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 1 - 7 of 7 Posts. Stock valve sizes? . FORD, SMALL BLOCK 302 HO w/ E7, GT40P & GT40 - Alex's Parts

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