This time around, we chose a shining example of this junkyard art form. The MPH was there to run a little better but the local track is about terrible. I have to agree, the GT40P heads flow better than the GT40 iron heads. *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Stock valve sizes? Do not ever, ever think about using the tube type manifolds. The tube headers showed a gain of almost 100 hp! Works on all factory cast iron E7, GT40, and GT40P cylinder heads! AFR 165 Heads | Have options for pedestal mounted rocker arms or stud mounted rocker arms. If I get different urges later, Ill pursue those then. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. Yea. Ported Hurricane Single Plane and custom 750 HP. Install a Ford Motorsport E303, X303 or F303 cam, or any of the similar units from Indy, Lunati or your favorite manufacturer. Keywords The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. made more power everytwhere and 40 hp is respectable. 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. $139.99. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. 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. I just read about this build on the corral.net. They almost seem like flywheel numbers rather than RWHP numbers. 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. We know what you're thinking--only two-tenths from an extra 45 hp? 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. If you know him, ask him. Your IP: A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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. at the crank. Compare. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. 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. There are caveats to this plan, however. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. You didnt provide a lot of information about the engine itself, Im assuming its 85 or newer ( roller cam) May need a freshen up of the bottom end if compression is the issue. hole size 302 is 7/16 and 351 is 1/2 Even with a stock Mustang 5.0 cam makes good power. JEGS High Performance. Perhaps even more surprising was how well this engine idled, calmly purring with 16 inches of manifold vacuum at 980 rpm. Just got through porting one of my gt40p heads today. This 1979-1995 Mustang cylinder head and camshaft guide will overview the heads and cams we offer and how they will coincide. the springs are new stock oem ford. 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! Eldelbrocks Air Gap intake manifold should work well with the combination. This needs to be removed and different exhaust valves, retainers, and valve springs added to turn this into a decent street head. 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. GT40Ps have 58cc. Long tube headers are a terrific idea, but you need to open up the exhaust side. Through Central Coast you can have the heads fully prepped for your combination. At the dragstrip, we gained two-tenths and 2 mph. Enter your search keyword. Keep in mind that swapping camshafts is a fairly extensive effort. Car Craft mag. 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. SB Ford, GT40 .575" Lift Max Output II Drop in Valve Spring Kit, Hyd Roller, 140 Lb Seat. #1:::Throw out all your Magazines that suggest what to do! 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). Dennis Hilliard of Central Coast says we can expect to gain three-tenths in the quarter-mile. And have discovered something that I dont think anyone else knows. 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. Yeah, out of a bolt on upgrade, you'd probably be looking at 260-280rwhp ish with supporting mods. If you can get the mentioned GT-40 heads with studs for a good price, that would be good for you. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. These are some of the pictures I have showing the Explorer manifolds. Runs well. With no other changes we gained 25 hp using factory iron heads. Skip to main content. i have a 302 engine from a 1977 granada and i am wondering if gt40p heads from an explorer will fit on this motor. It turned out we were conservative on both counts. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. Where they differ is the combustion chamber size. 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! . GT40, GT40P, would be great factory heads. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. These are Ford iron GT-40P heads. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. 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 was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. Sponsored. Save narve00 Do you guys have part numbers for the spring kits? This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. Definitely going to use my P heads. 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? The action you just performed triggered the security solution. Without changing the stock pistons. We were cruising the 'yard a while back and located a 2000 Ford Explorer with an EFI 5.0L V-8 engine. Beyond the engine's amazingly good appearance, Moore had a couple of good reasons for choosing this engine. We also added a veteran Ford magnetic pickup distributor and used it to drive an MSD ignition system. This is what I recommend to everyone who is doing a budget 5.0 build. Now we know why Dennis Hilliard of Central Coast Mustang is so high on these heads. . Im now thinking of adding a cam to match the carb. This engine will be good for your 65 Mustang. Not sure how they would mate up to your existing exhuast, but otherwise they should work. HAD '82 GT monochromatic (red).black cloth HAVE I'd much rather be able to drive it at 8 or 9/10s of what it can handle. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. 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. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. For all of us interested in Gt40p heads. I plan on running a AFM b31 cam too which has relatively small duration for the intake valve. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. The heads also required some machine work, including screw-in studs, guideplates, and widening the spring pockets for bigger valvesprings. SB Ford GT40P Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. There are too many variables to add to this regarding aftermarket stroker kits or components. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. 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. The only one that's close, is #7. 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. The GT40P cylinder heads had a small combustion chamber ranging from 58-61cc while the GT40 heads had a 63-66cc combustion chamber. 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. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 1.7 shaft rockers and beehives. Calculating pushrod length Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. For 2018, the Coyote makes 460 hp. 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. 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. 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. 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! If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. 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. Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? This combination should be good for about 400 horsepower and as much as 500 if you opt to use the stronger aftermarket pistons. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! We heated the bottle to 950 psi and hit the button at 4,500 rpm. A mild porting with gasket matching will be very good. 68stang351 Founding Member May 16, 2002 850 This will cost additional money but is still worth it, in our opinion. Stock 1989 5.0L HO pistons will work if you can find them. 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. 950.00 us a set and will ship . 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. It runs smooth but seems lazy. 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. You could run a thinner head gasket as well. You just want to keep it out of detonation. that is a healthy budget deal. Most of them are aware of what changes need to be completed. Buy the lifters for peace of mind now and hopefully for the duration. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. Headers and a camshaft will help but the engine really needs aftermarket 3/8 inch connecting rod bolts and aftermarket cylinder heads. 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. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. Manual trans. The rest went very smoothly, and we reused the stock lifters and suffered no ulcers worrying about breaking in the cam. Come join the discussion about restoration, modifications, NOS parts, troubleshooting, VIN codes, and more! 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. Im 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. They work, but present their own challenges. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. GT40P heads, what kind of performance do they give? But dont think that adding a bigger camshaft will make more power. Win or lose, if you buy the ticket you must take the ride. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Overview. 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. 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. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. 402 HP NA from a HI PO 289 isnt that mysterious of a feat to accomplish with todays SBF Aftermarket parts availability. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. Or just play it safe and let the fans ask away about another daring 5.0 TB bolt on or for an exciting surprise, do a LS______ fill in the blanks. . The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. Gt40 heads/intake from a jy explorer, leave the . Anythoughts? Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. 69.90.139.244 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. The spark plug issue is almost a non-issue. 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. For a better experience, please enable JavaScript in your browser before proceeding. 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 This will keep you from dropping your overall static compression ratio and losing power. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. Start with any 302 block, but try to find one from 1985 and up since it will already have provisions for a roller camshaft. Mac and Ford Motorsport both make a GT40P spacific header. Because of this, your tuneup will probably need to be modified. But the part about a cam replacement possibly being a labor intensive undertaking is correct. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. how hard to put on? fordfan289, Aug 27, 2011 Per a UEM tech support email I have the Icon IC736 is supposed to be good for GT40 heads when I asked about it. 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. No-option stripper- I like strippers. 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. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. 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. BONUS TEST-FOUR DIFFERENT 302 INTAKES.. Just make sure it is a roller cam. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. 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. 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. 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. 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 recall having an absolute blast with my old K-code coupe back in the day. We compare the GT40s to modern cylinder heads as well as other heads from the era. I have a 432 HP non Hi Po 289 I built. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. This test went so well that we were eager to see what the slightly bigger cam would do. Theres many options available for a little more power. 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. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. The gt40p head is considered the best OEM 302 head made. Step 1. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. I am working on a set of iron GT40s hoping it goes faster. the engine is carburated of that makes a difference. 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. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. Slover primarily focused on the exhaust side of the GT40P heads. You can have your current 28 oz rebalanced to 50. Its NA but makes use of AFR heads and some other aftermarket goodies. I need that part number too! i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). 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. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. 87-93-95 Ford Mustang GT40P Engine Cylinder Heads REBUILT 302 351 GT40 SBF OEM | eBay Motors, Parts & Accessories, Car & Truck Parts & Accessories | eBay! 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. I have managed to get 402 horse power from a 289 hipo natural aspirated. Let us explain. You didnt mention which cam you had in mind. I got a GT40P off the assembly line years ago. #2::: Get advice from a reptile engine builder with experience(first flag for me is when somebody refers to an ENGINE as a MOTOR! A LOT of them do it these days. Holley 670 street avenger carb. OR you could put your automotive journalistic skills in motion by reporting on the many new modern components available for the latest generation 351 Cleveland. I have a 5.0 from a 1992 Mustang in my 65. In less than an hour, we were ready to test. This is an older thread, you may not receive a response, and could be reviving an old thread. After a couple grand you have a killer set of heads, but there's got to be a less-expensive way of making horsepower. But what we were most impressed with was the solid gain in torque over the smaller Voodoo cam from 3,500 and up. 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 . Here is the lowdown on exhaust manifolds and VALVE SPRINGS. That's a good combo in my book. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. I had those on my car before I upgraded and they were nice heads. check out the. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. this is the price for one head. ***Most important is theStupid question is the one that was never asked!*** Be careful, I was once bitten by one of those reptile engine builders. 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'm sure the dyno operator used some goofball correction factor to make the numbers look higher. You will have to address the 50 oz balance of the 5.0 engine by getting a 50 oz flywheel. could the gear of off the oil pump drive(i know they're DIS), for the explorer motor be used on his dizzy? We gained 45 hp and 40 lb-ft of torque. 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. JavaScript is disabled. 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. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. I got a set of AFR heads , night and day. 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. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Consider having the head's intake ports matched to the intake manifold gasket. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. This website is using a security service to protect itself from online attacks. You gave me the info I was looking for, and I really do appreciate it. Im a different animal. Choose a cylinder head before you install the pistons. You'll have to plug the oil hole that is in the engine from the old oil dipstick. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel.
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