Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. Real world data seems to show that GT40 or GT40P cylinder heads, assuming no other mods on your Foxbody, are good to add anywhere between 20-40 HP (over stock heads). For real performance, stock E7TE heads leave a lot to be desired. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. 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. You can email the site owner to let them know you were blocked. AFR 165cc 58cc Heads. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. 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. Where they differ is the combustion chamber size. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. Like I said lots of options. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. Here is my setup. Both swaps made more sense when parts were readily available at the bone yard for cheap. Dyno results GT40P heads | Vintage Mustang Forums 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. Have fun, be safe, enjoy. And remember ENGINES have been being built/rebuilt/modified for years. 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. 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. 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. Very true about finding them at the local yards. We know what you're thinking--only two-tenths from an extra 45 hp? Gt40 heads/intake from a jy explorer, leave the . The kit offers adjustable power from 50 to 250 hp with a simple jet change. hole size 302 is 7/16 and 351 is 1/2 Well also assume that this engine is running stock exhaust manifolds. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. 302 GT40 Dyno Results - FourEyedPride.com I view the GT40P heads similar to Granada brakes. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. Stock 1989 5.0L HO pistons will work if you can find them. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. This is the main reason why these engines are not modified as much as the small block Chevy. Pretty sure that was name, but I could be wrong. We gained 45 hp and 40 lb-ft of torque. Even with a stock Mustang 5.0 cam makes good power. The Fora platform includes forum software by XenForo. Ford Factory 5.0 Performance Cylinder Heads. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Torque on the other hand isnt something to write home about. If you're running a stock cam, 1.7 rockers will work perfectly. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. I am working on a set of iron GT40s hoping it goes faster. I recall having an absolute blast with my old K-code coupe back in the day. 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. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. I spin it to 6500 and thats about it. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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. For 2018, the Coyote makes 460 hp. There are too many variables to add to this regarding aftermarket stroker kits or components. Nudge us with emails, and we'll make it happen. at the crank. 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. 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. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. GT40Ps have 58cc. Yea. gt40p heads on a 289 in a 66 | Vintage Mustang Forums When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Not looking for crazy HP. 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. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. 1979 Indy 500 Pace Car. Runs well. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. SBF engines are modified constantly. 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 When building an engine there is a lot to take into consideration. Sponsored. Those heads were unported and had stock valve sizes! Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. This is needed for the steel roller cam. You keep stock drivability, and stock gas milage if you can stay out of boost. Choose a cylinder head before you install the pistons. 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. They fill that spot between power and budget. 302 with GT40 heads | Ford Mustang Forums Once the headers are in place, then you can consider if you still want more power. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Over $2050 for the 165/185 renegades. Not sure how they would mate up to your existing exhuast, but otherwise they should work. 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. That's fantastic for the minimal investment we made. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. The gt40p head is considered the best OEM 302 head made. GT40P Heads how much hp from them. - StangNet We need a build on a 400+ hp 302/6 build. T5 with 3.73s. Dec 8, 2011. At the dragstrip, we gained two-tenths and 2 mph. The combination of this cam with your intake and headers will produce a very nice street engine. A LOT of them do it these days. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. 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 might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. made more power everytwhere and 40 hp is respectable. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. A forum community dedicated to Ford Mustang owners and enthusiasts. Assorted screwdrivers, pliers and vise-grips. 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. Some ideas never go out of style. 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. 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. are you twisted331 also? An aggressive cam will wake it up a bit. . gt40p headers | Maverick/Comet Forums 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. Here a comparison of different heads on a 302: I'm very happy with my GT40P. Related Resources Mustang Generation Nicknames: What Do They Mean? For a better experience, please enable JavaScript in your browser before proceeding. anyone have experience with GT40P heads on a 92 351W AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. Using the manufacturer recommended springs for your camshaft are a safe bet. people can stop saying that adding aftermarket cam with stock heads is a waste of time. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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. 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 heads that were used were also old C8 casting with 58cc chambers. Budget 300HP 302 Build THANKS VERY MUCH! Long tube headers are a terrific idea, but you need to open up the exhaust side. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) JavaScript is disabled. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. Take the assembly to a machine shop to have it balanced and install it in the block. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. This will cost additional money but is still worth it, in our opinion. 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. A good port job can set you back another $500-$1,000. Fastest e303 5.0l's? - FourEyedPride.com It's a classic move we've pulled off many times. 302 heads on 351w | ClassicBroncos.com Forum We've already been motivated to put this engine in a buddy's Mustang. He'll have to get a gear for his distributor. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 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? 351W with GT40P heads? | Mercury Cougar Owners The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. 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. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. this head fits years 95-01 explorer mountaineer mercury mountaineer . thats after 3 hours of idling/midrange hits to tune the idle and part throttle . SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. First, adding headers will improve power on the existing combination. K.S. This engine will be good for your 65 Mustang. While the heads were off getting a massage, we turned our attention to the cam timing. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Ive been building ENGINES for 40+ years. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. 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. Because of this, your tuneup will probably need to be modified. Well that article just got me very ancy, I want these heads!! P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. The spark plug issue is almost a non-issue. Get 500 Horsepower from a Junkyard Ford Explorer 302 - MotorTrend According to his data and verified dyno tests with an EFI 302, you can go above this level if you port the stock, lower intake manifold, or upgrade it altogether. The dyno recorded a peak horsepower reading of 489 hp, but the air/fuel ratio was slightly on the rich side at 11.5:1, so we increased the nitrous jet to a 61 and hit the button again. 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. Calculating pushrod length 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. I turned it because it was tired when I got it. With nitrous, this is easily a mid-11-second ride. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I had a set of 69 302 heads I ran for a while . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. well i finally did my first ever carb build, ive always been an EFI guy Black 1985 GT: 408w, in the 6's in the 1/8 mile. JEGS High Performance. 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. The action you just performed triggered the security solution. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. 289 or 351 heads on a 302 advantage? | The H.A.M.B. For this reason, we're not sure what kind of boost the GT-40P heads will give. 1983 Mustang G.T. Yes- thank you. . GT 500; Posts: 8496; Location: Brisbane . Speedmaster PCE281.2046 Small Block Ford Aluminum Cylinder Heads 62cc Not to mention, they will run circles around GT40P's out of the box. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. If you're going to use the stock 289 heads, install 1.84-inch intake valves, then port the intake and exhaust; these mods will net you about 185 cfm of intake port flow at 0.50 lift. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. A trip to Orlando Speed World provided us with updated quarter-mile times. However I think the opportunity window is slowly closing. The reply has so many assumptions that I cant even assume to know the answer. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. Ford Explorer Mountaineer 5.0 Ohv Iron 302 Sbf (its not their engine) T5z and 3.89 9" TL rear. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. Anyways, I know the gt40ps will bump . Im a different animal. Took me 7 hours to do one head.but they cleaned up real nice. Cant wait to try um out. 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Joined . Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. 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. Performance & security by Cloudflare. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. I've got gt40p heads for it I'll be running, and can't afford better . P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Learn how your comment data is processed. Shop by category. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. 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. 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. 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. 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! You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. GT-40P Heads - 5.0 Mustang & Super Fords Magazine - MotorTrend 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.