Check my post above. P-heads have a smaller combustion chamber at 59cc, which will bump the compression ratio up on an otherwise-stock 5.0 engine. ***Most important is theStupid question is the one that was never asked!*** SBF FORD Aluminum Cylinder Heads 302 /351w 190cc 62cc 2.02 /1.60 For ROLLER CAM. SB Ford GT40 Drop In Valve Springs Kit, Hyd Roller w/ Stock Cam, .450" lift and below. I think one of the finer traits of a true car guy, is the patience to put a prized car away and just let it sit for a while rather than selling it when life gets in the way. Mac and Ford Motorsport both make a GT40P spacific header. Rowe studied engineering, philosophy and American literature at Central Florida Community College. 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. I am very happy too. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS. I need that part number too! GT40Ps have 58cc. You could run a thinner head gasket as well. If you dont feel comfortable doing this higher a pro. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. Never not once have I ever seen a SBF rod bolt create a failure. 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. 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. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. 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. 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. The engine never huffed oil out of the breathers, and the spark plugs all looked excellent. I've not seen a set of longtubes that have an issue with GT40P's, either. 1983 Mustang G.T. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. 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. Nudge us with emails, and we'll make it happen. 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. Yea. the engine is carburated of that makes a difference. Tim's junkyard refugee survived the beating and we had a bitchin' story. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. If there isnt room without disassembling half the front clip on the car, then it might be easier to remove the engine and do the conversion that way. Yep my **** is coming apart again Isnt life great! 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'll prob take a trip up there this weekend after scavenging the junkyards, thanks a million. Your IP: Be careful, I was once bitten by one of those reptile engine builders. If I get different urges later, Ill pursue those then. They almost seem like flywheel numbers rather than RWHP numbers. Save narve00 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. Last Edit: January 18, 2015, 12:05:31 pm by businesstrader Logged shaunp. I'd get the gt40 setup, and put an s trim on it. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . I used Lightning heads on my 302, (GT40 not P) with stock rockers on a flat tappet engine. (its not their engine) A forum community dedicated to Ford performance owners and enthusiasts. Win or lose, if you buy the ticket you must take the ride. These are among the best of the iron Ford Windsor heads as they tend to flow much better than earlier castings. I got lucky and found a complete Explorer GT40P engine online. A forum community dedicated to Ford Mustang owners and enthusiasts. But don't think that adding a bigger camshaft will make more power. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. The action you just performed triggered the security solution. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. Commonly referred to as Explorer heads, GT-40P iron castings are found on current 5.0-equipped Explorers. These engines came with the GT40P head, which even with its small valves, offers really good performance. Test 3: Installed the larger Lunati camagain, no other changes. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Manual trans. Compare. 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. 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. 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. 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. 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. T5 with 3.73s. The only one that's close, is #7. 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. 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. Slover primarily focused on the exhaust side of the GT40P heads. Because of this, your tuneup will probably need to be modified. If you go with a diffrent cam, make sure you change springs, The Trick Flow kit comes with everything for around $130. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. A trip to Orlando Speed World provided us with updated quarter-mile times. AFR 165cc 58cc Heads. how hard to put on? On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. 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. Some ideas never go out of style. Click to reveal 950.00 us a set and will ship . Can I run the new cam with the same roller hydraulic lifters or do I have to change the lifters too? Assorted screwdrivers, pliers and vise-grips. 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 set of 1.7:1 roller-tipped rocker arms on the heads. 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. Both have very similar valve sizes, but the GT40P head has slightly larger combustion chambers for a small bump in compression and better flow. They work, but present their own challenges. The Fora platform includes forum software by XenForo. 69.90.139.244 Consider having the head's intake ports matched to the intake manifold gasket. 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. Pride is built, in your garage, with your two hands. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Free shipping. 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. 302, GT40P Heads, E cam, 4 into 4, Holley 600, Mallory Unilite, Levy SD T5, 3.73, 15" Team III, firewall mod, trunk mod, trailer hitch, drivers foot box mod, front tow rings. Well also assume that this engine is running stock exhaust manifolds. 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. Install a set of 1.7:1 roller-tipped rocker arms on the heads. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. For both the GT40 and GT40p heads, I STRONGLY suggest upgrading the valve springs. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. FULL DYNO RESULTS. 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! 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. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. I'm sure the dyno operator used some goofball correction factor to make the numbers look higher. Ive been building ENGINES for 40+ years. There are caveats to this plan, however. Most of the time, GT-40 heads are worth a good 20-40hp over stock heads. For a better experience, please enable JavaScript in your browser before proceeding. Good on ya Jeff Smith. We are offering a pair of original Ford Cobra 5.0 GT40 cast iron cylinder heads. 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. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. that is a healthy budget deal. Related Resources Mustang Generation Nicknames: What Do They Mean? If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. made more power everytwhere and 40 hp is respectable. Early Windsors tend to have fairly restrictive exhaust manifolds, making the addition of a set of headers that much more efficient. These are some of the pictures I have showing the Explorer manifolds. GT40, GT40P, would be great factory heads. Both swaps made more sense when parts were readily available at the bone yard for cheap. You can have your current 28 oz rebalanced to 50. With the tuning finalized, the little cam made far more power than we expected, cranking out 328 lb-ft of torque at 4,200 and 294 hp at 5,400 rpm. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Not to mention, they will run circles around GT40P's out of the box. He'd be the best source. 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. Thank You. Very true about finding them at the local yards. All costing in the end at least another $2k. Anythoughts? 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 kit offers adjustable power from 50 to 250 hp with a simple jet change. And have discovered something that I dont think anyone else knows. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. Build Thread 1965 Fastback Project "Racesteed". 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. In mid-1997, the Explorer and Mountaineer 5.0 L heads were revised and renamed . We will go into more detail on the head mods in a later story in Junkyard Builder, so watch for it. I was thinking the same but the enforcers are $647ea now so $1400 (inc tax) is the entry price for good set of heads. Can anyone give me a little feedback about a '99 Explorer 5.0, and tell me if it's my answer. I have a 432 HP non Hi Po 289 I built. I had a set of 69 302 heads I ran for a while . Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. In a lightweight Fox or early Mustang with a five-speed behind it, this would be a great little street engine. #1:::Throw out all your Magazines that suggest what to do! If you can find individual flanged headers like the obsolete MAC headers had, those worked really well with GT40P's. The car weighs #2835 with driver. These are some of the best castings Ford ever produced for this engine, and are still fairly cheap and available used. 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. Because its all been done time after time after. 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! Location: Re: Stock Ford 351W 4bbl dyno numbers. Building a 302-inch small-block to produce 400 hp is really no big deal, but doing. Then why did you port the heads and how do you know if you made an improvement. But the part about a cam replacement possibly being a labor intensive undertaking is correct. Plus you will need to drill all the head bolt holes out as the 351W uses larger head bolts. I don't need tons of power to enjoy the car. I'll save the effort and lighten my front end by 50# with aluminum. 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. The 2 heads are about the same when looking at the numbers with the GT40p heads having a slight edge. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. All this is worth it. The engine was only rated at 215 hp, but it at least had 9.0:1 compression. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. by travis Sun May 03, 2020 8:33 am. 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. I got rid of the carburetor and went with a F.A.S.T. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. 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. The combination of this cam with your intake and headers will produce a very nice street engine. check out the. You'll have to plug the oil hole that is in the engine from the old oil dipstick. Keep in mind that swapping camshafts is a fairly extensive effort. Keywords For real performance, stock E7TE heads leave a lot to be desired. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads 68stang351 Founding Member May 16, 2002 850 I'd much rather be able to drive it at 8 or 9/10s of what it can handle. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. They also have emissions legal heads as well. You keep stock drivability, and stock gas milage if you can stay out of boost. GT40P heads, what kind of performance do they give? These timeslips are from 1280' above sea level. There are several actions that could trigger this block including submitting a certain word or phrase, a SQL command or malformed data. Compare. This website is using a security service to protect itself from online attacks. This is just a quick overview of the changes that need to be done. At the dragstrip, we gained two-tenths and 2 mph. Their weak point is that the rotator used on the exhaust valve is very thick. 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. These are a great head but do need some machining mods to make they really work well. '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 MAC is the only manufacturer of these headers, and the parts we installed fit like a glove with no problems whatsoever. Here a comparison of different heads on a 302: I'm very happy with my GT40P. Ford's seminal 302 engine (later re-dubbed the 5.0) has been popular with budget-minded hot rodders for decades. You can have your current 28 oz rebalanced to 50. JavaScript is disabled. Obviously, tuneups will vary. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. 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. 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. Step 2. 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. Those heads were unported and had stock valve sizes! 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. JavaScript is disabled. I can tell you that with my 9.503 block, 22cc dished pistons and 64cc heads, I'm at 9.5:1 compression. Weiand 7515 xcellerator intake. At the time, I was still running smog equipment in a 1994 Mustang GT, so I had them drill the back of the heads for the thermactor connection. The reason for this is that we're actually replacing mildly worked E7TE heads. 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. This test went so well that we were eager to see what the slightly bigger cam would do. You can email the site owner to let them know you were blocked. 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. I'm wondering how these heads will interact with the paxton 1220 sl supercharger I'm trying to put on. 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. Scorpion 1.6 roller rockers. 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. Let us explain. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. So . 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. Assuming the above configurationa pushrod 5.0L will potentially make between 250 and 260 hp. 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. When building an engine there is a lot to take into consideration. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. With nitrous, this is easily a mid-11-second ride. 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). Central Coast Mustang sells GT-40P heads at a great price, making them a viable alternative in a market flooded with performance head choices. Holley 670 street avenger carb. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. This pushed that little Ford to a peak horsepower of 503, and that was where we stopped. 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. I have a 302 Windsor V8 EFI engine that I converted to a 600 cfm carburetor with a Street Warrior intake manifold. 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. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. Enter your search keyword. 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. The MPH was there to run a little better but the local track is about terrible. I am working on a set of iron GT40s hoping it goes faster. After we installed the heads and with the fan off, he ran a 12.46 at 107.9. 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. We turned to Rare Auto Design in Orlando for dyno tests to find out how much horsepower we gained. JavaScript is disabled. I view the GT40P heads similar to Granada brakes. The headers will improve this airflow throughout the entire rpm rangeadding more torque and horsepower. For a better experience, please enable JavaScript in your browser before proceeding. Im a different animal. I'm using the Trick Flow stage 1 cam with 1.7 roller rockers. The later model distributors had a different diameter shaft than the earlier ones. just curious. SBF engines are modified constantly. 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.