For this reason, we're not sure what kind of boost the GT-40P heads will give. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. This will keep you from dropping your overall static compression ratio and losing power. 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. I've got gt40p heads for it I'll be running, and can't afford better . Thanks. FULL DYNO RESULTS. This kind of improvement may not seem like much, but the owner of our test car, Jamie Holten, runs in FFW Trophy Stock where three-tenths is a lifetime. If you dont feel comfortable doing this higher a pro. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. how much HP and torque? Took me 7 hours to do one head.but they cleaned up real nice. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. this is the price for one head. Without changing the stock pistons. Choose a cylinder head before you install the pistons. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads We know what you're thinking--only two-tenths from an extra 45 hp? ***Most important is theStupid question is the one that was never asked!*** You can have your current 28 oz rebalanced to 50. Theres many options available for a little more power. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. What would be the best cam and springs to use for these heads in a 302 Windsor? P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? Over $2050 for the 165/185 renegades. 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. 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. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. Our recommendation would be, rather than change the camshaft, you might want to look into adding a set of long-tube headers and a dual exhaust if the engine is not already so equipped. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. Ill do springs and a moderate cam and go for a good, dependable power plant. The GT40 heads have thermactor holes built in to connect to the EGR/smog equipment whereas the GT40P heads use an external EGR connective system. They also have emissions legal heads as well. Shop by category. We gained 45 hp and 40 lb-ft of torque. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Location: Re: Stock Ford 351W 4bbl dyno numbers. that is a healthy budget deal. 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. Test 3: Installed the larger Lunati camagain, no other changes. Rowe studied engineering, philosophy and American literature at Central Florida Community College. The later model distributors had a different diameter shaft than the earlier ones. When I purchased my "brand new" set of GT40P's, I bought them from an Mustang specific machine shop that used to exist called Central Coast Mustang. So I've got the motor and heads already for my maverick project. check out the. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. 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. Compare. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. 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. They work, but present their own challenges. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Install a set of 1.7:1 roller-tipped rocker arms on the heads. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. 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. The spark plug issue is almost a non-issue. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. This is the main reason why these engines are not modified as much as the small block Chevy. While the heads were off getting a massage, we turned our attention to the cam timing. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. 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. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The gt40p head is considered the best OEM 302 head made. As with all head installations, check piston-to-valve clearance before final startup. Car Craft mag. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. Save narve00 The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. 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. #1:::Throw out all your Magazines that suggest what to do! #3::: Do your homework,get quality parts,dont skimp. With. 68stang351 Founding Member May 16, 2002 850 I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. You just want to keep it out of detonation. . Just got through porting one of my gt40p heads today. The tube headers showed a gain of almost 100 hp! 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. A COMP hydraulic roller cam we found works well with this combination. This will cost additional money but is still worth it, in our opinion. 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. Anythoughts? REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. Once the headers are in place, then you can consider if you still want more power. These are a great head but do need some machining mods to make they really work well. $169.50. It took him and yours truly eight hours from start to finish, using air tools and a lift to gain access to the header flanges. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. That's a good combo in my book. Sponsored. This is an older thread, you may not receive a response, and could be reviving an old thread. Motor is going into a Ranger. 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? this head is complete with new 1.837 int valves and 1.536 exhaust valves. 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. Every thing he tells you on this site is true. 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. made more power everytwhere and 40 hp is respectable. I'm also have the regular GT40 heads on my current build. JavaScript is disabled. 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. 1.7 shaft rockers and beehives. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. Torque on the other hand isnt something to write home about. For a better experience, please enable JavaScript in your browser before proceeding. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. HAD '82 GT monochromatic (red).black cloth HAVE You can find them on later model Mercury Mountaineers and several other Ford SUV applications. 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. 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. Yea. Required fields are marked *. Scorpion 1.6 roller rockers. Performance & security by Cloudflare. Cant wait to try um out. 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. Also, the spark plug angle makes it a pain. I must agree with Jeff Smith. But dont think that adding a bigger camshaft will make more power. When building an engine there is a lot to take into consideration. He'll have to get a gear for his distributor. Both swaps made more sense when parts were readily available at the bone yard for cheap. 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. 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. Eldelbrocks Air Gap intake manifold should work well with the combination. We need a build on a 400+ hp 302/6 build. This engine will be good for your 65 Mustang. The heads that were used were also old C8 casting with 58cc chambers. The asterisk HP differences are calculated using Test 1's 294-hp peak. Where they differ is the combustion chamber size. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. Maybe I'll think about a cam swap? I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. 69.90.139.244 And have discovered something that I dont think anyone else knows. Everything fits, use the stock rockers and pushrods. 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. Depending on the Headers you have you might be okay. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. (its not their engine) These timeslips are from 1280' above sea level. All manufactured using advanced CNC technology for the extreme durability and precision required of the modern canted valve Ford Small Block at power levels around the 1000 mark reached during recent competitions at the EMC and at the strip. Stock valve sizes? They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. If they are cheap enough, take them anyway. I have a very good running stock 1981 302 in a F100 short box. Assuming this will be a daily driver engine, a short duration camshaft, especially when combined with a four-barrel dual plane intake manifold and headers, will deliver extremely snappy throttle response and the whole combination will increase the torque and peak horsepower by somewhere in the neighborhood of 20 to perhaps 35 horsepower. 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. $139.99. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. Overview. i'd love to use these heads,. A forum community dedicated to Ford performance owners and enthusiasts. 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. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. All costing in the end at least another $2k. The action you just performed triggered the security solution. I got a GT40P off the assembly line years ago. We compare the GT40s to modern cylinder heads as well as other heads from the era. No-option stripper- I like strippers. Not bad for off the shelf parts and a stock shortblock. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. For 2018, the Coyote makes 460 hp. 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. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Boy, were we surprised with the results. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. at the crank. As usual, there is much more to this story. 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. They fill that spot between power and budget. Yep my **** is coming apart again Isnt life great! 1979 Indy 500 Pace Car. $700.98. Be careful, I was once bitten by one of those reptile engine builders. 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. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. Like I said lots of options. Because of this, your tuneup will probably need to be modified. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. (Please note these are not GT40P Explorer heads). On slicks the car went some low 7.70s right at 90mph. GT40s have 64cc chambers. 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. The only one that's close, is #7. Instructions on porting the GT-40p heads here. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. For a better experience, please enable JavaScript in your browser before proceeding. K.S. 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Joined . This is what I recommend to everyone who is doing a budget 5.0 build. The longer duration created a slight loss of torque below 3,300 rpm compared to both previous cams, but beyond that mild loss of power, the bigger Voodo out-powered its smaller cousin, cranking out a peak torque of 355 lb-ft at 4,300 (a gain of 7 lb-ft over Test 2) and charging to a peak horsepower of 376 at 6,000 rpm. Along with the heads, we used MAC headers for GT-40P heads. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. $700.98. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. Well offer one as an example. . fuel injection system . A forum community dedicated to vintage Ford Mustang owners and enthusiasts. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. Ha! Keep in mind that swapping camshafts is a fairly extensive effort. The "P" heads flow better. 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. A trip to Orlando Speed World provided us with updated quarter-mile times. E303 Cam advanced 4 degrees. Because its all been done time after time after. Holley 670 street avenger carb. These engines came with the GT40P head, which even with its small valves, offers really good performance. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Win or lose, if you buy the ticket you must take the ride. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. 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. There are too many variables to add to this regarding aftermarket stroker kits or components. I don't need tons of power to enjoy the car. Runs well. HiPo manifolds and Ill be good. This time around, we chose a shining example of this junkyard art form. Sure, you could race-port the existing E7 castings, which many have done, but then you're putting quite a bit of change into stock heads. 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. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. by travis Sun May 03, 2020 8:33 am. Stock 1989 5.0L HO pistons will work if you can find them. Ford Factory 5.0 Performance Cylinder Heads. The only way to really make more power is to go with a stroker kit, blower and/or heads. For a better experience, please enable JavaScript in your browser before proceeding. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Thank You. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Compare. $930.00 + $55.00 shipping. Tim's junkyard refugee survived the beating and we had a bitchin' story. 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. Really hurt too. Best of all, no machining is required to install these on your stock cast iron heads! Hey all, I'm working on building a 302 with my gt40p heads. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. T5z and 3.89 9" TL rear. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. Dec 8, 2011. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. 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. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Check my post above. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. people can stop saying that adding aftermarket cam with stock heads is a waste of time. JavaScript is disabled. fordfan289, Aug 27, 2011 Build Thread 1965 Fastback Project "Racesteed". Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Calculating pushrod length 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. 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. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! THANKS VERY MUCH! All this is worth it. 1986 Short block with notched pistons. For the cherry on top of this Blue Oval desert, we bolted Mike Thermos' simple Powerstar plate nitrous system under the carburetor, installed the 140-hp jets (55 fuel and 55 nitrous), and used the trigger to retard the timing on the MSD ignition by 8 degrees. Its NA but makes use of AFR heads and some other aftermarket goodies. 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. 1983 Mustang G.T. 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. For those of you running a carb, or aftermarket intake, you already have a leg up in this area and should see even greater gains in power. Buy the lifters for peace of mind now and hopefully for the duration. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. Assorted screwdrivers, pliers and vise-grips. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. And remember ENGINES have been being built/rebuilt/modified for years. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. However there are plenty of factory heads that with the help of an experienced machine shop can be great. This test went so well that we were eager to see what the slightly bigger cam would do. Pride is built, in your garage, with your two hands. Not sure how they would mate up to your existing exhuast, but otherwise they should work. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. I turned it because it was tired when I got it. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. 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.
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