Win or lose, if you buy the ticket you must take the ride. 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. FULL DYNO RESULTS. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. I bought a crate 302 from Downs Ford a few years ago that was producing 320 hp. When building an engine there is a lot to take into consideration. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Well assume it is a 5.0L with stock heads. K.S. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. He'll have to get a gear for his distributor. 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. A COMP hydraulic roller cam we found works well with this combination. When compared to the new generation of performance engines on the market today like the 5.0L DOHC Coyote engine, your engine will not come close. Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. Pride is built, in your garage, with your two hands. 1983 Mustang G.T. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Motor is going into a Ranger. 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. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Stock 1989 5.0L HO pistons will work if you can find them. 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. hole size 302 is 7/16 and 351 is 1/2 Really hurt too. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. I got a set of AFR heads , night and day. Aftermarket headers, such as those made by Hooker, BBK and Competition Engineering, are better and are just as easy, if somewhat more expensive, to procure used. 1.7 shaft rockers and beehives. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. GT 500; Posts: 8496; Location: Brisbane . Scorpion 1.6 roller rockers. For this reason, we're not sure what kind of boost the GT-40P heads will give. 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. 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. 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. For a better experience, please enable JavaScript in your browser before proceeding. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. That's an improvement of 22 hp over Test 2. 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. I need that part number too! Features hardened 4140 Chromoly retainers, valve locks, spring shims, a spring height gauge, valve seals, and instructions. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. 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 . $700.98. We heated the bottle to 950 psi and hit the button at 4,500 rpm. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. Install a set of 1.7:1 roller-tipped rocker arms on the heads. 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. 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. Ive been building ENGINES for 40+ years. 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. (its not their engine) JEGS High Performance. 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. Never not once have I ever seen a SBF rod bolt create a failure. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. 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. The cost of a new set of standard replacement roller lifters is very affordable at major retailers like Summit. Through Central Coast you can have the heads fully prepped for your combination. 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. #3::: Do your homework,get quality parts,dont skimp. 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. FORD GT40p 4 BAR HEADS IN GOOD CONDITION . Every thing he tells you on this site is true. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. I have a very good running stock 1981 302 in a F100 short box. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. Manual trans. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. I'll save the effort and lighten my front end by 50# with aluminum. I have a 5.0 from a 1992 Mustang in my 65. I've got gt40p heads for it I'll be running, and can't afford better . 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. We compare the GT40s to modern cylinder heads as well as other heads from the era. With. I am working on a set of iron GT40s hoping it goes faster. GT40P heads, what kind of performance do they give? And agree the cams do help and a few tricks with the heads that I have discovered really make a difference. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. 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. Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. 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. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. We gained 45 hp and 40 lb-ft of torque. Holley 670 street avenger carb. 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. Small-block Fords and Mopars only use four head bolts per cylinder, so retaining proper head-gasket sealespecially with nitrousis a point that demands attention, so we ordered a set of Fel-Pro MLS head gaskets rather than a standard, composition gasket. If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. 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. Also, you'll need to get a steel distributor gear to replace the iron gear that is currently on your distributor. Over $2050 for the 165/185 renegades. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. Once the headers are in place, then you can consider if you still want more power. GT40, GT40P, would be great factory heads. Those heads were unported and had stock valve sizes! Eldelbrocks Air Gap intake manifold should work well with the combination. This is a function of the somewhat wider lobe-separation angle of 112 degrees. Yeah, except those. a) ain't early and b) aren't 289 heads. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. Slover primarily focused on the exhaust side of the GT40P heads. Tim's junkyard refugee survived the beating and we had a bitchin' story. For a better experience, please enable JavaScript in your browser before proceeding. 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. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. JavaScript is disabled. A trip to Orlando Speed World provided us with updated quarter-mile times. JavaScript is disabled. 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:?:!?!?!? Im now thinking of adding a cam to match the carb. They fill that spot between power and budget. Here a comparison of different heads on a 302: I'm very happy with my GT40P. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. 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. How much HP and torque do you think I. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . I am very happy too. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. . The HP DIFF column on the far right lists the horsepower difference between Test 1 and Test 3. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. For a better experience, please enable JavaScript in your browser before proceeding. And have discovered something that I dont think anyone else knows. These heads have been remanufactured using refaced reclaimed Factory Valves. fuel injection system . i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. 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. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. 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. 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. Ported Hurricane Single Plane and custom 750 HP. This is an older thread, you may not receive a response, and could be reviving an old thread. That's more than enough to feed a power-brake booster. So . This engine will be good for your 65 Mustang. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Ford Factory 5.0 Performance Cylinder Heads. What would be the best cam and springs to use for these heads in a 302 Windsor? Yea. . VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The reason this new generation of Ford engines make a ton more power is they also enjoy fantastic cylinder heads and four valves per cylinder. You could run a thinner head gasket as well. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. E303 Cam advanced 4 degrees. Overview. Well also assume that this engine is running stock exhaust manifolds. This test went so well that we were eager to see what the slightly bigger cam would do. However, stepping up in the performance head market will set you back more than $1,200 for a decent pair of aluminum castings--and that's straight out of the box, with no porting. 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. 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. I turned it because it was tired when I got it. 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. You keep stock drivability, and stock gas milage if you can stay out of boost. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. The GT40P heads flow a lot better than stock 351 heads. 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. There is a better way. The valve seats have been cut on a . The '00 Ford Explorers and Mercury Moutaineers were factory equipped with one of Ford's better 5.0L motors. at the crank. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. 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. They work, but present their own challenges. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. 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! Now he serves as a regular contributor to OnAllCylinders. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. These are a great head but do need some machining mods to make they really work well. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. 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. There are too many variables to add to this regarding aftermarket stroker kits or components. You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. You might even say its like flogging a dead horse without any animals actually being injured during my moments of sarcasm. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. - I have a 1989 f150 with a 302 5 spd. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! Anythoughts? Anyways, I know the gt40ps will bump . Joined: Sun Mar 15, 2009 9:31 am. 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. GT40Ps have 58cc. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? 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. I got a GT40P off the assembly line years ago. A forum community dedicated to Ford performance owners and enthusiasts. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. Calculated compression to 9.8:1. I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. Take the assembly to a machine shop to have it balanced and install it in the block. Took me 7 hours to do one head.but they cleaned up real nice. You just want to keep it out of detonation. Stock 93-95 Cobra shortblock (stock cobra cam), GT40X heads, 1.7 rockers, Edelbrock Performer RPM intake, Holley 650, and longtube headers. Pretty sure that was name, but I could be wrong. Theres many options available for a little more power. Posted on May 07, 2014 by promarengine. that is a healthy budget deal. The Fora platform includes forum software by XenForo. the springs are new stock oem ford. 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. The newer camshaft is designed for use with a soft bronze distributor gear, not the hardened steel gear used for older camshafts. ported GT-40p, ported cobra intake, 65mm BBK, e-cam with 1.7s, longtubes, off-road x-pipe with flowmasters dumped. 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). 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. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. 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. 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. You'll have to plug the oil hole that is in the engine from the old oil dipstick. 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. Where they differ is the combustion chamber size. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. Rowe studied engineering, philosophy and American literature at Central Florida Community College. The Fora platform includes forum software by XenForo. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! 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. We started with a 120,000-mile 5.0L out of a Ford Explorer, removed the EFI and DIS, and pocket ported the stock GT40P iron heads with stock valve sizes. Shop by category. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 1 - 7 of 7 Posts. Good Luck. Performance & security by Cloudflare. I've not seen a set of longtubes that have an issue with GT40P's, either. 1983 Mustang G.T. It runs smooth but seems lazy. 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. A forum community dedicated to Ford Mustang owners and enthusiasts. 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'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. You can have your current 28 oz rebalanced to 50. 69.90.139.244 So I've got the motor and heads already for my maverick project. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. The car weighs #2835 with driver. I love my setup and it is very strong engine. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. If you have a early 351W ie pre 76 it probably . Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! When you purchase through links on our site, we may earn an affiliate commission, which supports our community. MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Keep in mind that swapping camshafts is a fairly extensive effort. 302 .030 over with; Scat Forged Steel Rods, SpeedPro pistons and rings . After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. by travis Sun May 03, 2020 8:33 am. THANKS VERY MUCH! And remember ENGINES have been being built/rebuilt/modified for years. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. how much HP and torque? 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. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more! Weiand 7515 xcellerator intake. These engines came with the GT40P head, which even with its small valves, offers really good performance. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Consider having the head's intake ports matched to the intake manifold gasket. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. I have a 66 mustang with its original untouched 289 with over 140 k on it that Ive been running a blow thru turbo making 14 lbs of boost on for the last 5 years and its never given me a problem. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. $169.50. Obviously, tuneups will vary. That said there are some better aftermarket options for heads also. Skip to main content. For 2018, the Coyote makes 460 hp. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. 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. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Im a different animal. In a 3,250-pound car like a Mustang with 3.50 gears and an automatic with a 2,800-rpm converter, this 5.0L could pull 12.80s at 108 mph. Be careful, I was once bitten by one of those reptile engine builders. Mar 23, 2004. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. 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). An aggressive cam will wake it up a bit. Calculating pushrod length people can stop saying that adding aftermarket cam with stock heads is a waste of time. built one using a 91' HO short block with a set of AFR 165 heads, Weiand . You can use the stock roller lifters with any size cam you want.
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