The tube headers showed a gain of almost 100 hp! You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. You gave me the info I was looking for, and I really do appreciate it. Joined . I am sure you have increased the bore size and possibly even the stroke a bit and spin it up pretty high in the RPM range. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. I turned it because it was tired when I got it. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. A LOT of them do it these days. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. Maybe I'll think about a cam swap? GT40P heads? how hard to put on? how much HP and torque? Posted on May 07, 2014 by promarengine. Actually the regular gt40's in either aluminum or iron are the good ones but the gt40p's are only a slight improvement over regular 302 heads. Depends on the budget. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. . 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. (its not their engine) 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. JavaScript is disabled. 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. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. this head is complete with new 1.837 int valves and 1.536 exhaust valves. For all of us interested in Gt40p heads. Richard Rowe has been writing professionally since 2007, specializing in automotive topics. As with all head installations, check piston-to-valve clearance before final startup. 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! I guess I had it backwards, sorry about that, didn't mean to spread misinformation. Most of them are aware of what changes need to be completed. Well offer one as an example. Nice to see actual dyno results instead of "butt dyno" guesses. That carbureted GT40P motor made 465 on th engine dyno with a .500" 239/244 camshaft, Holley 650 carb and Weiand Stealth intake. I am very happy too. Manual trans. A COMP hydraulic roller cam we found works well with this combination. PTP Engineering front suspension and 25540R17s all around. You can email the site owner to let them know you were blocked. Yea. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Once the headers are in place, then you can consider if you still want more power. 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. 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. With. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Weiand 7515 xcellerator intake. These are Ford iron GT-40P heads. anyone have experience with GT40P heads on a 92 351W 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. 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. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! This will keep you from dropping your overall static compression ratio and losing power. 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? Build Thread 1965 Fastback Project "Racesteed". Good on ya Jeff Smith. Nudge us with emails, and we'll make it happen. Well assume it is a 5.0L with stock heads. He has worked as a tractor-trailer driver and mechanic, a rigger at a fire engine factory and as a race-car driver and builder. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. I got lucky and found a complete Explorer GT40P engine online. Click to reveal There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! Ported Hurricane Single Plane and custom 750 HP. 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. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. ford 302 sbf gt40p v8 cast iron complete cylinder head and head bolts and head gasket set. When building an engine there is a lot to take into consideration. GT40P Heads how much hp from them. - StangNet 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. 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. Here a comparison of different heads on a 302: I'm very happy with my GT40P. And have discovered something that I dont think anyone else knows. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. GT40 Heads On A 289? | Ford Muscle Cars Tech Forum Step 2. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. Over $2050 for the 165/185 renegades. Good Luck. This time around, we chose a shining example of this junkyard art form. 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. Motor is going into a Ranger. 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. Very true about finding them at the local yards. At the dragstrip, we gained two-tenths and 2 mph. I'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Tim's junkyard refugee survived the beating and we had a bitchin' story. Cant wait to try um out. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? 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. We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. But the part about a cam replacement possibly being a labor intensive undertaking is correct. 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. 1996-2001 Ford Explorer 5.0L V8 Specifications Rowe studied engineering, philosophy and American literature at Central Florida Community College. In less than an hour, we were ready to test. Anyways, I know the gt40ps will bump . 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. I had a set of 69 302 heads I ran for a while . Do you guys have part numbers for the spring kits? 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. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. 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. That's a good combo in my book. Even with a stock Mustang 5.0 cam makes good power. That's fantastic for the minimal investment we made. I'd get the gt40 setup, and put an s trim on it. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. GT40P heads, what kind of performance do they give? That's more than enough to feed a power-brake booster. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. These are some of the pictures I have showing the Explorer manifolds. If they are cheap enough, take them anyway. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. Dyno results GT40P heads | Vintage Mustang Forums The "P" heads flow better. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. This is what I recommend to everyone who is doing a budget 5.0 build. Choosing pistons to complement GT40P heads - MustangWorks.com Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? 1983 Mustang G.T. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Ford Explorer Mountaineer 5.0 Ohv Iron 302 Sbf For a better experience, please enable JavaScript in your browser before proceeding. JavaScript is disabled. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. I am working on a set of iron GT40s hoping it goes faster. For the most part 302 heads and 351W heads are the same. 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. 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. Your email address will not be published. This engine will be good for your 65 Mustang. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. 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. A trip to Orlando Speed World provided us with updated quarter-mile times. '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 that is a healthy budget deal. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. If you dont feel comfortable doing this higher a pro. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. The reason for this is that we're actually replacing mildly worked E7TE heads. 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. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. 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. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. The hardest part of swapping the cam was just getting the timing cover off and back on again. Hey all, I'm working on building a 302 with my gt40p heads. The later model distributors had a different diameter shaft than the earlier ones. Gt40/gt40p Heads On A 351w Questions - StangNet If I get different urges later, Ill pursue those then. 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:?:!?!?!? The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. I'll save the effort and lighten my front end by 50# with aluminum. 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. Here is the lowdown on exhaust manifolds and VALVE SPRINGS. We've already been motivated to put this engine in a buddy's Mustang. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. It's a classic move we've pulled off many times. Both swaps made more sense when parts were readily available at the bone yard for cheap. Please include what you were doing when this page came up and the Cloudflare Ray ID found at the bottom of this page. 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. These are a great head but do need some machining mods to make they really work well. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. I got a GT40P off the assembly line years ago. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Overview. AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Boy, were we surprised with the results. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. With nitrous, this is easily a mid-11-second ride. I'm also have the regular GT40 heads on my current build. I got lucky and found a complete Explorer GT40P engine online. This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. No-option stripper- I like strippers. The action you just performed triggered the security solution. A forum community dedicated to Ford performance owners and enthusiasts. No-option stripper- I like strippers. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. They also have emissions legal heads as well. This is just a quick overview of the changes that need to be done. 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. Instructions on porting the GT-40p heads here. 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. I view the GT40P heads similar to Granada brakes. 302HO with gt40p heads | Mustang Forums at StangNet T5z and 3.89 9" TL rear. 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. Free shipping. (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. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Im a different animal. What did the heads flow? In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . What you are trying to do is to increase the amount of airflow through the engine in order to make more power. You keep stock drivability, and stock gas milage if you can stay out of boost. With gt40p heads and 289 hipo exhaust manifolds changing sparkplugs is the same as the original 302 heads and manifolds, I use the spark plugs that are recomended for the explorer with gt40p heads and you can use straight or angled boots. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. 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. Related Resources Mustang Generation Nicknames: What Do They Mean? You need to check. LOW-BUCK 302 FORD HEAD UPGRADE - YouTube He'll have to get a gear for his distributor. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. Keywords Within a few hours of his discovery, the engine was sitting in the back of his truck on its way to a new home. 1 - 7 of 7 Posts. Hey Motorheadty,Like your comments,question for ya,I have a 92 convertible,just bought a 5.0 out of a 94 gt that was just freshened up top end,gt40p heads w/new springs etc for the new E303 cam,new FRP roller lifters,Crane 1.7 rockers,hardened push rods,double roller timing set,all put on a bottom end w/104000 miles,needless to say previous owner pulled said engine after 800 miles and now building a 351,I pulled engine down my machinest,putting forged internals in and bolting everything back together,I want to run about a 150 shot N2o,and iam going carb,wondering which intake would be best w/the 150 shot,heard that dual planes might not be the way to go? P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. All in all, the addition of GT-40P heads to any 5.0 Mustang is a worthwhile venture, especially if you're on a budget (aren't we all) or shooting for the Trophy Stock title. 289 or 351 heads on a 302 advantage? | The H.A.M.B. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. 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. The valve seats have been cut on a . Like I said lots of options. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. This test went so well that we were eager to see what the slightly bigger cam would do. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Gt40 heads/intake from a jy explorer, leave the . the engine is carburated of that makes a difference. We didn't increase the valve size, although we did have to add Manley valves to get the proper spring-installed height. They work, but present their own challenges. 302 GT40 Dyno Results - FourEyedPride.com If you have a early 351W ie pre 76 it probably . The only one that's close, is #7. You can find them on later model Mercury Mountaineers and several other Ford SUV applications. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. I got rid of the carburetor and went with a F.A.S.T. Stock 1989 5.0L HO pistons will work if you can find them. Im now thinking of adding a cam to match the carb. 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. timing and compression ratio with gt40p heads - Modded Mustang Forums $930.00 + $55.00 shipping. Long tube headers are a terrific idea, but you need to open up the exhaust side. 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). 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. 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. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. With the engine reassembled, we boxed up our second camshaft and headed for Westech's dyno. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Along with the heads, we used MAC headers for GT-40P heads. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. 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 . 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. The GT40P heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. Since the engine is nearly stock, we would want to choose a relatively mild camshaft with somewhat more lift and duration than stock, but again not going too aggressive. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Take the assembly to a machine shop to have it balanced and install it in the block. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. The gt40p head is considered the best OEM 302 head made. JavaScript is disabled. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat.