The hardest part of swapping the cam was just getting the timing cover off and back on again. AFR 165cc 58cc Heads. That's fantastic for the minimal investment we made. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. JavaScript is disabled. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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 . The reason for this is that we're actually replacing mildly worked E7TE heads. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. I have heard this rod bolt weakness myth for years but have yet to have a single problem with them in any of the SBF engines I have pounded on for the last 30 years and there have been lots of them. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. 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. Along with the heads, we used MAC headers for GT-40P heads. I spin it to 6500 and thats about it. 68stang351 Founding Member May 16, 2002 850 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. There are a couple of reasons for this suggestion. 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. Dec 8, 2011. people can stop saying that adding aftermarket cam with stock heads is a waste of time. 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. 69.90.139.244 Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. 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. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? 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. 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 . Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. The combination of this cam with your intake and headers will produce a very nice street engine. No-option stripper- I like strippers. I have a very good running stock 1981 302 in a F100 short box. With no other changes we gained 25 hp using factory iron heads. Because of this, your tuneup will probably need to be modified. For the most part 302 heads and 351W heads are the same. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. 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 Free shipping. Location: Re: Stock Ford 351W 4bbl dyno numbers. 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. 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. Good Luck. Calculating pushrod length I have a 5.0 from a 1992 Mustang in my 65. I am working on a set of iron GT40s hoping it goes faster. 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. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Keep in mind that swapping camshafts is a fairly extensive effort. Once the headers are in place, then you can consider if you still want more power. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. 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. Keywords 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. 1979 Indy 500 Pace Car. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. This is not a criticism but instead consider it to be more of a heads-up. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. Stock valve sizes? 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. I was looking at putting on the GT40P heads on. HAD '82 GT monochromatic (red).black cloth HAVE 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. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. Mac and Ford Motorsport both make a GT40P spacific header. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. 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. Definitely going to use my P heads. JavaScript is disabled. They almost seem like flywheel numbers rather than RWHP numbers. And have discovered something that I dont think anyone else knows. He'll have to get a gear for his distributor. 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). E303 Cam advanced 4 degrees. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. 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. 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. 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. So I've got the motor and heads already for my maverick project. A forum community dedicated to Ford performance owners and enthusiasts. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. fordfan289, Aug 27, 2011 Shop by category. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Also, the spark plug angle makes it a pain. The asterisk HP differences are calculated using Test 1's 294-hp peak. Tim's junkyard refugee survived the beating and we had a bitchin' story. I turned it because it was tired when I got it. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. 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. Your email address will not be published. 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. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. 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. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. What would be the best cam and springs to use for these heads in a 302 Windsor? 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. 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. Assorted screwdrivers, pliers and vise-grips. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. Now he serves as a regular contributor to OnAllCylinders. fuel injection system . Free shipping. 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 action you just performed triggered the security solution. the springs are new stock oem ford. This time around, we chose a shining example of this junkyard art form. For a better experience, please enable JavaScript in your browser before proceeding. If you have a early 351W ie pre 76 it probably . 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. It's a classic move we've pulled off many times. I recall having an absolute blast with my old K-code coupe back in the day. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. 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. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Cant wait to try um out. . 1986 Short block with notched pistons. JavaScript is disabled. I'm running BBK un-equal length shorty's, and I'm able to get all the plugs in, tight, and all plug wires on. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. You can email the site owner to let them know you were blocked. 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. '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 Install a set of 1.7:1 roller-tipped rocker arms on the heads. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Step 1. Slover primarily focused on the exhaust side of the GT40P heads. Eldelbrocks Air Gap intake manifold should work well with the combination. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. 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. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Those heads were unported and had stock valve sizes! That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! 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. The only one that's close, is #7. Sponsored. 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. It turned out we were conservative on both counts. 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. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . Holten runs the factory fan, but he had removed it when he ran the 12.63. I got a set of AFR heads , night and day. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Holley 670 street avenger carb. We've seen what happens from previous Ford experience when power levels above 500 hp tend to either pop head gaskets or saw blocks in half. Over $2050 for the 165/185 renegades. 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. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. Its NA but makes use of AFR heads and some other aftermarket goodies. are you twisted331 also? Boy, were we surprised with the results. how much HP and torque? 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. Car Craft mag. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. I've not seen a set of longtubes that have an issue with GT40P's, either. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. Compare. The Fora platform includes forum software by XenForo. Win or lose, if you buy the ticket you must take the ride. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. Free shipping for many products! Check my post above. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Ha! I just read about this build on the corral.net. Do you guys have part numbers for the spring kits? I'm also have the regular GT40 heads on my current build. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Those are really good numbers. hole size 302 is 7/16 and 351 is 1/2 Step 2. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. 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. These engines came with the GT40P head, which even with its small valves, offers really good performance. at the crank. 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. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. I love my setup and it is very strong engine. First, adding headers will improve power on the existing combination. Because its all been done time after time after. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. FULL DYNO RESULTS. 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. Just got through porting one of my gt40p heads today. Well assume it is a 5.0L with stock heads. That said there are some better aftermarket options for heads also. Where they differ is the combustion chamber size. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. At the dragstrip, we gained two-tenths and 2 mph. Well also assume that this engine is running stock exhaust manifolds. This will keep you from dropping your overall static compression ratio and losing power. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Choose a cylinder head before you install the pistons. Ported Hurricane Single Plane and custom 750 HP. The heads that were used were also old C8 casting with 58cc chambers. 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. Through Central Coast you can have the heads fully prepped for your combination. Best of all, no machining is required to install these on your stock cast iron heads! If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. T5z and 3.89 9" TL rear. We decided on a Powerstar kit from Nitrous Supply, owned by our good friend Mike Thermos, who was one of the original nitrous kit suppliers back in the early '80s. this is the price for one head. that is a healthy budget deal. Good on ya Jeff Smith. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. If you know him, ask him. There is a better way. 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. Find many great new & used options and get the best deals for FORD GT40p 4 BAR HEADS IN GOOD CONDITION w/ONE BOLT BROKEN at the best online prices at eBay! A forum community dedicated to Ford Mustang owners and enthusiasts. The Fora platform includes forum software by XenForo. 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. The Fora platform includes forum software by XenForo. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. We gained 45 hp and 40 lb-ft of torque. Skip to main content. While the heads were off getting a massage, we turned our attention to the cam timing. how hard to put on? GT40Ps have 58cc. I have to agree, the GT40P heads flow better than the GT40 iron heads. They fill that spot between power and budget. All this is worth it. 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. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. So . Shop by category. Both swaps made more sense when parts were readily available at the bone yard for cheap. SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. Gt40 heads/intake from a jy explorer, leave the . PTP Engineering front suspension and 25540R17s all around. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. Like I said lots of options. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. I got rid of the carburetor and went with a F.A.S.T. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. Yea. GT40s have 64cc chambers. Despite adding 30 degrees of intake duration, this cam improved torque throughout the entire test from 3,000 rpm on up. Learn how your comment data is processed. 1983 Mustang G.T. Have fun, be safe, enjoy. 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. GT40P heads, what kind of performance do they give? I am very happy too. I've got gt40p heads for it I'll be running, and can't afford better . built one using a 91' HO short block with a set of AFR 165 heads, Weiand . 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. the engine is carburated of that makes a difference. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. With. 950.00 us a set and will ship . 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. 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. That's more than enough to feed a power-brake booster. For a better experience, please enable JavaScript in your browser before proceeding. These are some of the pictures I have showing the Explorer manifolds. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. HiPo manifolds and Ill be good. For a better experience, please enable JavaScript in your browser before proceeding. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. 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. 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. ***Most important is theStupid question is the one that was never asked!*** 68 XR7 & 68 M-100. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. A mild porting with gasket matching will be very good. 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). Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. 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. I got a GT40P off the assembly line years ago. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. You just want to keep it out of detonation. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. i have a question once i get the gt40p heads from the explorer truck can i also take the exhaust manifolds or headers and fit them in my 66 mustang:?:!?!?!? SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The valve seats have been cut on a . Test 3: Installed the larger Lunati camagain, no other changes. Mar 23, 2004. Their weak point is that the rotator used on the exhaust valve is very thick. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. I'll save the effort and lighten my front end by 50# with aluminum. Take the assembly to a machine shop to have it balanced and install it in the block. This is what I recommend to everyone who is doing a budget 5.0 build. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. The only way to really make more power is to go with a stroker kit, blower and/or heads. 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. 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. Compare. 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. There are too many variables to add to this regarding aftermarket stroker kits or components. Scorpion 1.6 roller rockers. GT 500; Posts: 8496; Location: Brisbane . SBF engines are modified constantly. 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. +1 I would go with the regular GT40 heads. 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.

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