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. Check my post above. . Because of this, your tuneup will probably need to be modified. If they are cheap enough, take them anyway. 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. 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. I don't need tons of power to enjoy the car. For 2018, the Coyote makes 460 hp. how hard to put on? The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Theres many options available for a little more power. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! Car Craft mag. 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. You could run a thinner head gasket as well. Every thing he tells you on this site is true. GT40, GT40P, would be great factory heads. Step 1. The GT40P heads flow a lot better than stock 351 heads. 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. As with Chevrolet's small-block engine, the aftermarket has had dozens of years to expand the range and reduce the cost of the parts they offer for this engine. I have a 5.0 from a 1992 Mustang in my 65. If you're running a stock cam, 1.7 rockers will work perfectly. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Long tube headers are a terrific idea, but you need to open up the exhaust side. Here a comparison of different heads on a 302: I'm very happy with my GT40P. You didnt mention which cam you had in mind. We know what you're thinking--only two-tenths from an extra 45 hp? Thank You. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. We've already been motivated to put this engine in a buddy's Mustang. A LOT of them do it these days. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. 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. Im a different animal. 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. You can use the stock roller lifters with any size cam you want. What did the heads flow? Never not once have I ever seen a SBF rod bolt create a failure. Sponsored. Nice to see actual dyno results instead of "butt dyno" guesses. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. Take the assembly to a machine shop to have it balanced and install it in the block. But dont think that adding a bigger camshaft will make more power. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. 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. Weiand 7515 xcellerator intake. Stock valve sizes? 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. 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. 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. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. There are a couple of reasons for this suggestion. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. PTP Engineering front suspension and 25540R17s all around. Yeah, except those. a) ain't early and b) aren't 289 heads. Install a set of 1.7:1 roller-tipped rocker arms on the heads. Free shipping. fordfan289, Aug 27, 2011 I'd get the gt40 setup, and put an s trim on it. However, when we dyno'd the car before installing the GT-40P heads, the fan was on the car. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. They work, but present their own challenges. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! Depending on the Headers you have you might be okay. We probably could have coaxed an even 300 hp out of this stock configuration, but with such good numbers, we decided to jump right into the first Lunati cam. You keep stock drivability, and stock gas milage if you can stay out of boost. JEGS High Performance. 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. 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. Some ideas never go out of style. 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. 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. A trip to Orlando Speed World provided us with updated quarter-mile times. If you dont feel comfortable doing this higher a pro. 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. Cant wait to try um out. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. (Image/Harrison Creamery). In less than an hour, we were ready to test. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. 97% Positive Feedback . GT40s have 64cc chambers. Anyways, I know the gt40ps will bump . Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 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. 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. Well offer one as an example. Motor is going into a Ranger. 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. Holten runs the factory fan, but he had removed it when he ran the 12.63. Save narve00 We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. how much HP and torque? The action you just performed triggered the security solution. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. $700.98. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. An aggressive cam will wake it up a bit. Similar to regular GT-40 heads, the biggest difference between the two is that the P-heads feature a revised spark plug angle which extends the plug into the combustion chamber, putting the flame front close to the absolute center of the chamber, resulting in a smoother combustion process. Well also assume that this engine is running stock exhaust manifolds. Hey all, I'm working on building a 302 with my gt40p heads. These heads have been remanufactured using refaced reclaimed Factory Valves. 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. 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. never messed with the timing, its at 35* total . 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. 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. . No-option stripper- I like strippers. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. I had a set of 69 302 heads I ran for a while . 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. I need that part number too! Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Skip to main content. GT 500; Posts: 8496; Location: Brisbane . The older pushrod engines just dont offer the same kind of power potential for their displacement and it all has to do with cylinder head flow. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. i know a guy who used to build race engines so he has all the right tools, how much would it help to get the heads ported and polished or anything else he could do to them. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. For a better experience, please enable JavaScript in your browser before proceeding. They fill that spot between power and budget. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. 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. Step 2. 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'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. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Paying a premium for a set of GT40P heads or dumping money into some to get their performance to rival aftermarket is not for me. .. i would not buy valves unless you need them amd would not switch to studs with these heads for your low hp . Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. You need to check. JavaScript is disabled. GT40Ps have 58cc. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. Your email address will not be published. It runs smooth but seems lazy. at the crank. Performance & security by Cloudflare. Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. GT40P heads, what kind of performance do they give? I am working on a set of iron GT40s hoping it goes faster. They also have emissions legal heads as well. Test 1: 750-cfm carburetor, dual-plane intake manifold, and stock camshaft. 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. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Ported Hurricane Single Plane and custom 750 HP. (Please note these are not GT40P Explorer heads). You can find them on later model Mercury Mountaineers and several other Ford SUV applications. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Here is the lowdown on exhaust manifolds and VALVE SPRINGS. You didnt mention the car this engine is in, but lets assume there is enough room to remove the radiator and any other coolers and perhaps some or all of the front grille and/or brackets before the cam has sufficient room to exit the front of the engine. With the P-heads requiring pedestal-mount rockers, we also called up Crane Cams for a set of 1.6 pedestal-mount roller rockers. I must agree with Jeff Smith. Late-model ford GT40 and GT40P heads with 1.84-inch intake valves will also flow 185 cfm at 0.50 . Seriously though if you're not planning on an all-out attack for HP, I'd consider a forged piston out of Probe's SRS line-up. '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 Limited header choice is certainly a challenge. Holley 670 street avenger carb. What would be the best cam and springs to use for these heads in a 302 Windsor? Ill do springs and a moderate cam and go for a good, dependable power plant. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. 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. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 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. Tim's junkyard refugee survived the beating and we had a bitchin' story. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) Required fields are marked *. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Calculated compression to 9.8:1. Assemble the rotating assembly with a stock 5.0L crankshaft, a set of 5.0L rods and the specified pistons with stock-type rings. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. 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? I've got gt40p heads for it I'll be running, and can't afford better . I got a set of AFR heads , night and day. Most of them are aware of what changes need to be completed. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . Horse Sense: The smaller valves found in GT-40P heads improve airflow velocity. Compare. 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. by travis Sun May 03, 2020 8:33 am. That's more than enough to feed a power-brake booster. 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. You can have your current 28 oz rebalanced to 50. Sponsored. For the most part 302 heads and 351W heads are the same. The car weighs #2835 with driver. - I have a 1989 f150 with a 302 5 spd. Im now thinking of adding a cam to match the carb. Nudge us with emails, and we'll make it happen. Different years can have different combustion chamber sizes but ffor the most part there will be no performance increases by going with 302 heads. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. Eldelbrocks Air Gap intake manifold should work well with the combination. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Maybe I'll think about a cam swap? These cast piston short-blocks are not quite as good as the forged piston 5.0L that came in Fox-body Mustangs, but the GT40P heads flow much better than earlier 5.0L heads. You didnt mention what camshaft you would be choosing or exactly which 5.0L Ford Windsor engine you are working with. 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. All this is worth it. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Keep in mind that swapping camshafts is a fairly extensive effort. A COMP hydraulic roller cam we found works well with this combination. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. check out the. 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 was looking at putting on the GT40P heads on. 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. Compare. A good port job can set you back another $500-$1,000. 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. For all of us interested in Gt40p heads. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Once the headers are in place, then you can consider if you still want more power. You just want to keep it out of detonation. Choose a cylinder head before you install the pistons. When you purchase through links on our site, we may earn an affiliate commission, which supports our community.
302 with gt40p heads horsepower