1979 Indy 500 Pace Car. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Check my post above. No-option stripper- I like strippers. 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. Along with the heads, we used MAC headers for GT-40P heads. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. I have a very good running stock 1981 302 in a F100 short box. Required fields are marked *. These are Ford iron GT-40P heads. I just read about this build on the corral.net. 1983 Mustang G.T. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! 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. Anyways, I know the gt40ps will bump . 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. Compare. the springs are new stock oem ford. Dec 8, 2011. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. If you dont feel comfortable doing this higher a pro. Ive been building ENGINES for 40+ years. This will keep you from dropping your overall static compression ratio and losing power. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. You need to check. GT 500; Posts: 8496; Location: Brisbane . JavaScript is disabled. 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. 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. . just curious. First, adding headers will improve power on the existing combination. The valve seats have been cut on a . In less than an hour, we were ready to test. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. never messed with the timing, its at 35* total . This is a function of the somewhat wider lobe-separation angle of 112 degrees. Be careful, I was once bitten by one of those reptile engine builders. FULL DYNO RESULTS. As with all head installations, check piston-to-valve clearance before final startup. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! this head is complete with new 1.837 int valves and 1.536 exhaust valves. Free shipping. 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. The only way to really make more power is to go with a stroker kit, blower and/or heads. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. 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. I need that part number too! HAD '82 GT monochromatic (red).black cloth HAVE The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Their weak point is that the rotator used on the exhaust valve is very thick. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. JavaScript is disabled. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. When building an engine there is a lot to take into consideration. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. There was an article in Hot Rod magazine in the mid '80's where Jon Kaase was developing 351w packages. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. However I think the opportunity window is slowly closing. I got lucky and found a complete Explorer GT40P engine online. 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. I'm 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. Stock heads with a fresh 3-angle valve job, shorty headers, T5, 4.10s, stock Explorer intake and stock '88 GT short block with 140,000 miles on it and an E cam in it. The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. 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. check out the. I have a 5.0 from a 1992 Mustang in my 65. Consider having the head's intake ports matched to the intake manifold gasket. Never not once have I ever seen a SBF rod bolt create a failure. This is a common mistake with first-time cam buyers who dont necessarily appreciate that the cam is just one component of the overall engine package. 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. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. We gained 45 hp and 40 lb-ft of torque. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. 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. GT40Ps have 58cc. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. Everything fits, use the stock rockers and pushrods. 1983 Mustang G.T. Over $2050 for the 165/185 renegades. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . 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. 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. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. Nudge us with emails, and we'll make it happen. Ha! The "P" heads flow better. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Yea. This engine will be good for your 65 Mustang. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . I guess I had it backwards, sorry about that, didn't mean to spread misinformation. 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! Again, assuming this is a nearly stock 5.0L with stock heads, the Weiand Street Warrior dual plane intake and 600 cfm carburetor, its important to not become overly aggressive and choose a big camshaft. 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. Scorpion 1.6 roller rockers. For a better experience, please enable JavaScript in your browser before proceeding. 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. 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. by travis Sun May 03, 2020 8:33 am. 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. 02-11-2012, 07:16 PM #6 fiveoh 86lx 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. These engines came with the GT40P head, which even with its small valves, offers really good performance. With nitrous, this is easily a mid-11-second ride. The kit offers adjustable power from 50 to 250 hp with a simple jet change. 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. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. However, theres a distinct possibility that I might pull all of my hair out if I see another in-depth article explaining how I, along with just over a billion other desperate humans seeking answers, need special valve spring split locks for my next tired Chevy build. Very true about finding them at the local yards. A COMP hydraulic roller cam we found works well with this combination. Do you guys have part numbers for the spring kits? #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. We know what you're thinking--only two-tenths from an extra 45 hp? 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? Without changing the stock pistons. Test 3: Installed the larger Lunati camagain, no other changes. THANKS VERY MUCH! For all of us interested in Gt40p heads. The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. This will cost additional money but is still worth it, in our opinion. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! 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:?:!?!?!? Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! For a better experience, please enable JavaScript in your browser before proceeding. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. A forum community dedicated to Ford performance owners and enthusiasts. 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). I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Step 1. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. 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 2: Changed to the smaller of the two Lunati camshaftsno other changes. Every thing he tells you on this site is true. For the most part 302 heads and 351W heads are the same. GT40s have 64cc chambers. It's a classic move we've pulled off many times. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. You can email the site owner to let them know you were blocked. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Install a set of 1.7:1 roller-tipped rocker arms on the heads. They work, but present their own challenges. 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. Overview. Torque on the other hand isnt something to write home about. However there are plenty of factory heads that with the help of an experienced machine shop can be great. Obviously, tuneups will vary. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. For a better experience, please enable JavaScript in your browser before proceeding. Save narve00 Im a different animal. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. 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. A good port job can set you back another $500-$1,000. JavaScript is disabled. With no other changes we gained 25 hp using factory iron heads. this is the price for one head. 68stang351 Founding Member May 16, 2002 850 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. $700.98. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. Learn how your comment data is processed. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. people can stop saying that adding aftermarket cam with stock heads is a waste of time. Sponsored. Runs well. These timeslips are from 1280' above sea level. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. this head fits years 95-01 explorer mountaineer mercury mountaineer . Win or lose, if you buy the ticket you must take the ride. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads At the dragstrip, we gained two-tenths and 2 mph. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Your email address will not be published. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. 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.