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JavaScript is disabled. You can have your current 28 oz rebalanced to 50. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. There are a couple of reasons for this suggestion. 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. 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. Required fields are marked *. just curious. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. 68 XR7 & 68 M-100. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! The GT40P heads flow a lot better than stock 351 heads. Nudge us with emails, and we'll make it happen. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. 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. All this is worth it. Anythoughts? GT40P heads, what kind of performance do they give? I guess someone could just do a basic valve job and throw on the GT40 upper/lower intake for a cheap HP boost. Because its all been done time after time after. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. 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. (its not their engine) Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. 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. Ported Hurricane Single Plane and custom 750 HP. How much HP and torque do you think I. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. However I think the opportunity window is slowly closing. ***Most important is theStupid question is the one that was never asked!*** Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. I added a link to it. 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. This is just a quick overview of the changes that need to be done. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. 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. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. '85 GT vert two tone (white on charcoal)white leather, http://www.facebook.com/groups/233213650060739/, http://www.summitracing.com/parts/TFS-2500100/, 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 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. In less than an hour, we were ready to test. But don't think that adding a bigger camshaft will make more power. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. We compare the GT40s to modern cylinder heads as well as other heads from the era. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. On slicks the car went some low 7.70s right at 90mph. (Please note these are not GT40P Explorer heads). You can use the stock roller lifters with any size cam you want. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. +1 I would go with the regular GT40 heads. So I've got the motor and heads already for my maverick project. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. These are some of the pictures I have showing the Explorer manifolds. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Like I said lots of options. A forum community dedicated to Ford Mustang owners and enthusiasts. Not bad for off the shelf parts and a stock shortblock. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . There are a lot of variables that must be addressed to give a better estimate, but a good basic estimate is 20-40 HP at the crank. This will cost additional money but is still worth it, in our opinion. I have to agree, the GT40P heads flow better than the GT40 iron heads. 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. We need a build on a 400+ hp 302/6 build. For real performance, stock E7TE heads leave a lot to be desired. Once the headers are in place, then you can consider if you still want more power. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. 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. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. As with all head installations, check piston-to-valve clearance before final startup. Overview. I wouldnt recommend reusing lifters though. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. 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. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. You could run a thinner head gasket as well. made more power everytwhere and 40 hp is respectable. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. Because of this, your tuneup will probably need to be modified. 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. Install a set of 1.7:1 roller-tipped rocker arms on the heads. I recall having an absolute blast with my old K-code coupe back in the day. The car weighs #2835 with driver. Yea. Test 3: Installed the larger Lunati camagain, no other changes. Dec 8, 2011. Compare. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Cloudflare Ray ID: 7a2e2d95dedea1e4 Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. I got lucky and found a complete Explorer GT40P engine online. Where they differ is the combustion chamber size. Nice to see actual dyno results instead of "butt dyno" guesses. Click to reveal 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. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! 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. T5 with 3.73s. And have discovered something that I dont think anyone else knows. 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. THANKS VERY MUCH! GT40s have 64cc chambers. 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. . GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Shop by category. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. With no other changes we gained 25 hp using factory iron heads. The reply has so many assumptions that I cant even assume to know the answer. 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. For a better experience, please enable JavaScript in your browser before proceeding. 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. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. Sponsored. (Image/Harrison Creamery). Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? 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. 950.00 us a set and will ship . 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. $700.98. The later model distributors had a different diameter shaft than the earlier ones. 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. 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. Depends on the budget. The Edelbrock Performer RPM is a good choice, but Holley, Weiand and Ford Motorsport also have similar offerings. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. Slover primarily focused on the exhaust side of the GT40P heads. Holley 670 street avenger carb. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. AFR 165cc 58cc Heads. That's more than enough to feed a power-brake booster. Keywords SBF engines are modified constantly. Your email address will not be published. 1986 Short block with notched pistons. Not looking for crazy HP. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. I'd get the gt40 setup, and put an s trim on it. 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. And remember ENGINES have been being built/rebuilt/modified for years. Good Luck. Through Central Coast you can have the heads fully prepped for your combination. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Choose a cylinder head before you install the pistons. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. The gt40p head is considered the best OEM 302 head made. Performance & security by Cloudflare. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Anyways, I know the gt40ps will bump . When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Ford Factory 5.0 Performance Cylinder Heads. 68 Mustang GT/CS Highland Green, PS, PB & Console, C Code w/C4 & 3.55 8 rear, If you aren't using the GT40P's stock, with maybe a spring upgrade and valve job, they aren't worth it anymore. 1.7 shaft rockers and beehives. PTP Engineering front suspension and 25540R17s all around. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. 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. 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. I got a GT40P off the assembly line years ago. I've not seen a set of longtubes that have an issue with GT40P's, either. this head is complete with new 1.837 int valves and 1.536 exhaust valves. $700.98. I have a 5.0 from a 1992 Mustang in my 65. how hard to put on? Well offer one as an example. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. Now he serves as a regular contributor to OnAllCylinders. 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. This time around, we chose a shining example of this junkyard art form. 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. Install a "wet" nitrous plate system (which carries both nitrous and fuel) onto the intake manifold and jet it conservatively for a 100 horsepower shot. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. 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. 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 hole size 302 is 7/16 and 351 is 1/2 If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. 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. So . These engines came with the GT40P head, which even with its small valves, offers really good performance. 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. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Step 2. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Maybe I'll think about a cam swap? The Fora platform includes forum software by XenForo. He'll have to get a gear for his distributor. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. A COMP hydraulic roller cam we found works well with this combination. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . 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. Well also assume that this engine is running stock exhaust manifolds. Yea. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. It turned out we were conservative on both counts. Step 1. 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. The only way to really make more power is to go with a stroker kit, blower and/or heads. These timeslips are from 1280' above sea level. Just got through porting one of my gt40p heads today. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. 1983 Mustang G.T. this head fits years 95-01 explorer mountaineer mercury mountaineer . 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. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! A forum community dedicated to Ford Mustang owners and enthusiasts. 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. 69.90.139.244 The reason for this is that we're actually replacing mildly worked E7TE heads. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. 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. The GT40P heads flow a lot better than stock 351 heads. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. 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. 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. The valve seats have been cut on a . If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. Those heads were unported and had stock valve sizes! how much HP and torque? Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Very true about finding them at the local yards. Really hurt too. 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. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. When building an engine there is a lot to take into consideration. Limited header choice is certainly a challenge. He'd be the best source. 1979 Indy 500 Pace Car. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. We know what you're thinking--only two-tenths from an extra 45 hp? T5z and 3.89 9" TL rear. 1983 Mustang G.T. Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. 302 explorer short block with roughly 80k miles GT40's from a local u pull n pay ($97) weiand x-celerator trick flow stage 1 cam 650 holley double pumper car made 322/329 SAE . Win or lose, if you buy the ticket you must take the ride. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. For a better experience, please enable JavaScript in your browser before proceeding. Calculating pushrod length 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. 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. 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. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. 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. $930.00 + $55.00 shipping. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . at the crank. Pride is built, in your garage, with your two hands. (A starter is a motor, windshield wipers use a motor,electric windows use motors) Any one uses that terminology in my shop will be corrected once, only once. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Theres many options available for a little more power. If I get different urges later, Ill pursue those then. Do you guys have part numbers for the spring kits? Definitely going to use my P heads. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. 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. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. We've already been motivated to put this engine in a buddy's Mustang. If they are cheap enough, take them anyway. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. K.S. Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. Every thing he tells you on this site is true. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. Took me 7 hours to do one head.but they cleaned up real nice. 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. 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. Pretty sure that was name, but I could be wrong. You didnt mention which cam you had in mind. Torque on the other hand isnt something to write home about. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Well assume it is a 5.0L with stock heads. Thank You. While we've seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. That's fantastic for the minimal investment we made. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. 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. I'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. $139.99. GT 500; Posts: 8496; Location: Brisbane . i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Keep in mind that swapping camshafts is a fairly extensive effort. If you have a early 351W ie pre 76 it probably . The Fora platform includes forum software by XenForo. This is a function of the somewhat wider lobe-separation angle of 112 degrees. Over $2050 for the 165/185 renegades. For a better experience, please enable JavaScript in your browser before proceeding. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. Let us explain. For a better experience, please enable JavaScript in your browser before proceeding. The heads that were used were also old C8 casting with 58cc chambers. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. 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. OR you could put your automotive journalistic skills in motion by reporting on the many new modern components available for the latest generation 351 Cleveland. I had those on my car before I upgraded and they were nice heads. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. that is a healthy budget deal. 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. Buy the lifters for peace of mind now and hopefully for the duration. Joined . 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.