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. Take the assembly to a machine shop to have it balanced and install it in the block. If you know him, ask him. Ported Hurricane Single Plane and custom 750 HP. They fill that spot between power and budget. this is the price for one head. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. Tim's junkyard refugee survived the beating and we had a bitchin' story. 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. K.S. I have managed to get 402 horse power from a 289 hipo natural aspirated. Ha! Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. Nice to see actual dyno results instead of "butt dyno" guesses. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. A forum community dedicated to Ford Mustang owners and enthusiasts. people can stop saying that adding aftermarket cam with stock heads is a waste of time. 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. Slover primarily focused on the exhaust side of the GT40P heads. However I think the opportunity window is slowly closing. Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Yeah, except those. a) ain't early and b) aren't 289 heads. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. A forum community dedicated to vintage Ford Mustang owners and enthusiasts. 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. $700.98. That's a 40 per cent increase in power from a simple head and cam swap, and one seriously happy Mustang owner! You'll also have to use your 289 timing chain cover since it has a hole for the oil dip stick and fuel pump. check out the. There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. Very true about finding them at the local yards. The reply has so many assumptions that I cant even assume to know the answer. For a better experience, please enable JavaScript in your browser before proceeding. The reason for this is that we're actually replacing mildly worked E7TE heads. Ive been building ENGINES for 40+ years. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. I've not seen a set of longtubes that have an issue with GT40P's, either. As with all head installations, check piston-to-valve clearance before final startup. And have discovered something that I dont think anyone else knows. #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. We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. They suffered from poor aftermarket support up until about 15 years ago when it really came on strong. A COMP hydraulic roller cam we found works well with this combination. Well assume it is a 5.0L with stock heads. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. You could run a thinner head gasket as well. i've got a short block started, and i recently came across a set of GT40P heads for FREE ( love family members). 1985 Mustang GT Mild 331 4bbl 5 spd, 1985 SEFI LTD LX AOD. I've got gt40p heads for it I'll be running, and can't afford better . 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? The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Not to mention, they will run circles around GT40P's out of the box. this head is complete with new 1.837 int valves and 1.536 exhaust valves. Good on ya Jeff Smith. The specs are a conservative 212/218 degrees of duration at 0.050-inch tappet lift but offer a really nice 0.512-inch valve lift for both the intake and exhaust. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 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. Well offer one as an example. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. '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 When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Check my post above. The Fora platform includes forum software by XenForo. This will follow the guideline of a 1.6 rocker baseline and factory bottom end 79-95 related 5.0L Mustangs only. How much HP and torque do you think I. 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. 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. Also, the spark plug angle makes it a pain. 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. I got rid of the carburetor and went with a F.A.S.T. 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. 1983 Mustang G.T. 97% Positive Feedback . If you smooth out the bowls and exhaust ports and gasket match the intakes they should flow decent. United Engine and Machine sells cheap but decent pistons that will do what you're wanting. Rowe studied engineering, philosophy and American literature at Central Florida Community College. Shop by category. Learn how your comment data is processed. All costing in the end at least another $2k. So I've got the motor and heads already for my maverick project. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. 1983 Mustang G.T. I wouldnt recommend reusing lifters though. I am very happy too. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Instructions on porting the GT-40p heads here. Yea. All Ford Mustangs | Model Specific Forums, GT-40P Heads - 5.0 Mustang & Super Fords Magazine. Gasoline/Diesel all makes on earth & still doing it today with great pride.Feel free to contact me anytime. Have fun, be safe, enjoy. I have a 432 HP non Hi Po 289 I built. 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 1979 Indy 500 Pace Car. (Image/Harrison Creamery). HiPo manifolds and Ill be good. Skip to main content. Free shipping for many products! 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. I don't need tons of power to enjoy the car. 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. 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. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. We know what you're thinking--only two-tenths from an extra 45 hp? Anyways, I know the gt40ps will bump . We set the timing to 34 degrees and rejetted the carburetor to get our desired 12.5:1 air/fuel ratio. Even with relatively small valve sizes of 1.85-inch intake and 1.46-inch exhaust, the P-heads flow much better than previous. 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 factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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. . 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). *** 65 Mustang 351C 4v, AOD, 4.11 gears *** 66 Galaxie convert big block. I got lucky and found a complete Explorer GT40P engine online. JavaScript is disabled. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. THANKS VERY MUCH! . JEGS High Performance. Works on all factory cast iron E7, GT40, and GT40P cylinder heads! You need to check. 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. 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. These heads have been remanufactured using refaced reclaimed Factory Valves. 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 hardest part of swapping the cam was just getting the timing cover off and back on again. Enter your search keyword. 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. Not sure about that but got some pictures of the cast iron explorer manifolds on a 302. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . 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.