You gave me the info I was looking for, and I really do appreciate it. The GT40P heads flow a lot better than stock 351 heads. Let us explain. Ported Hurricane Single Plane and custom 750 HP. 351W D0OE-C heads better than GT40P\'s? - Ford Muscle Cars Tech Forum Actually, making around 240 to 250 hp with a near-stock Windsor 302 will feel pretty good. Using the manufacturer recommended springs for your camshaft are a safe bet. REMANUFACTURED FORD 302 5.0 COBRA GT40 CYLINDER HEADS | What's New Along with the heads, we used MAC headers for GT-40P heads. Junkyard Gt40p Heads-add 30+ Hp to Your 5.0l (For Free?) For the first test, we were reusing the stock Explorer cam, so the engine didn't need any break-in time. For a better experience, please enable JavaScript in your browser before proceeding. I may do some port matching and a little cleanup, otherwise just a set of springs and cam and see what I have. many thanks to all you eco-hippies giving me dirty looks and helping me feel llike an overall badass rebel. Motor is going into a Ranger. Yea. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. The entire front accessory drive and timing chain cover must be removed, along with the distributor and intake manifold. With nitrous, this is easily a mid-11-second ride. 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. The GT40 & GT40P heads had a few differences that are note-worthy, the most importantly being the bump in compression. Don't let the fact that the iron GT40 heads have a larger exhaust valve fool you. The combination of this cam with your intake and headers will produce a very nice street engine. $700.98. I recall having an absolute blast with my old K-code coupe back in the day. Is asking advice for a fairly common situation involving parts with mandatory compatibility between the two for performance and longevity. 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. It has underdrive pulleys, MSD ignition, Bassanni headers and forward exit exhaust. 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. What you are trying to do is to increase the amount of airflow through the engine in order to make more power. 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. 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. #3::: Do your homework,get quality parts,dont skimp. 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. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. 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. $930.00 + $55.00 shipping. 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. Car Craft mag. Do not ever, ever think about using the tube type manifolds. 1 - 7 of 7 Posts. 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. 69.90.139.244 If you're running a stock cam, 1.7 rockers will work perfectly. Yes Mr.Smith, your column here at OAC adorned with extreme performance without power adders, or all Engine as its known, from a superior pushrod Small Block featuring almost all USA sourced modern components with the familiar smell of Ford Blue. First, adding headers will improve power on the existing combination. Compare. The question was whether we wanted a torquey small-block or a more cammed-up rpm engine to boost peak horsepower. 302 heads on 351w | ClassicBroncos.com Forum How much HP and torque do you think I. On slicks the car went some low 7.70s right at 90mph. Going from your heads to the GT40p heads will bump your compression by about a point.so hello bottom end torque. at the crank. This website is using a security service to protect itself from online attacks. As usual, there is much more to this story. We did a quick search for hydraulic roller cams and landed on a COMP camshaft that looked promising. Keep in mind that swapping camshafts is a fairly extensive effort. In less than an hour, we were ready to test. How to Build a Cheap Drag Racing 302 Ford Motor | It Still Runs 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. I need that part number too! Where they differ is the combustion chamber size. We gained 45 hp and 40 lb-ft of torque. Its NA but makes use of AFR heads and some other aftermarket goodies. They are more expensive than standard head gaskets, but they also do the job and are worth the additional money. Well also assume that this engine is running stock exhaust manifolds. 02-11-2012, 07:16 PM #6 fiveoh 86lx 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. Like I said lots of options. We need a build on a 400+ hp 302/6 build. However there are plenty of factory heads that with the help of an experienced machine shop can be great. 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 MPH was there to run a little better but the local track is about terrible. Once the headers are in place, then you can consider if you still want more power. As noted, this is looking like hes building a 351 Lightning truck motor, which is a good way to go. He'd be the best source. Do you guys have part numbers for the spring kits? Scorpion 1.6 roller rockers. Nudge us with emails, and we'll make it happen. GT40Ps have 58cc. 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. this head fits years 95-01 explorer mountaineer mercury mountaineer . They also have emissions legal heads as well. Build Thread 1965 Fastback Project "Racesteed". We guarantee plenty of burnout action when you add GT-40P heads to your 5.0 Mustang. 68 XR7 & 68 M-100. I've not seen a set of longtubes that have an issue with GT40P's, either. 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. The GT40P heads flow a lot better than stock 351 heads. Upgrading Fox Body Cylinder Heads - AmericanMuscle.com Through Central Coast you can have the heads fully prepped for your combination. Its funny no one mentioned anything about ignition timing or components, Your email address will not be published. Someone does make the Tri-Y's headers for the early Mustangs using the "P" heads. I'd get the gt40 setup, and put an s trim on it. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. Ford GT40P 302 5.0L 4 Bar Cylinder Head Assembly Pair w/ 1/2" Head Bolt Hole. In addition, the cam timing was designed for torque, with duration somewhere around 190 degrees at 0.050 with roughly 0.450-inch lift. They were located in Tahachapi CA, and were sold with upgraded springs for $650.00, back in 2002-2003 ish. #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'm an old school guy (289 in 65 mustang), and I'm just looking into the new 5.0 engine (roller cam) stuff recently. The reply has so many assumptions that I cant even assume to know the answer. And have discovered something that I dont think anyone else knows. 1.7 shaft rockers and beehives. Those are really good numbers. There are caveats to this plan, however. 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. 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. I love my setup and it is very strong engine. Understanding Ford's Fox Body GT40 Cylinder Heads - CJ Pony Parts Install a used set of 5.0L Mustang "shorty" headers, generally available at auto swap meets for a reasonable price. Vehicle: 1972 2 door 302 maverick, 1986 5.0 stang gt convertible,66 mustang coupe, HEMI ram. All costing in the end at least another $2k. 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. Purchase any used aftermarket manifold for the 302 that is designed to function in the 3,500 to 6,500 power band. If this is beyond your technical ability, you could ask a local machine shop to perform the modifications. GT-40 heads HP increase | Mustang Forums at StangNet The fix: basic power upgrades for a sluggish 302 Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W) - GT40P heads? What did the heads flow? 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 spark plug issue is almost a non-issue. A solid 300-325 hp should be plenty and that's with good drivability and reliability as well. 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. Ford 302W / 5.0L History & Specifications - The Ranger Station Yeah, except those. a) ain't early and b) aren't 289 heads. It's an 86 roller 5.0 engine that had a recent rebuild sometime in the past with keith black pistons, otherwise stock. A mild porting with gasket matching will be very good. 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. Pretty sure that was name, but I could be wrong. 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. For a better experience, please enable JavaScript in your browser before proceeding. However I think the opportunity window is slowly closing. If we subtract the 20 hp that the fan is worth, we end up with a gain of 25 hp. HAD '82 GT monochromatic (red).black cloth HAVE There are literally a dozen or so camshaft companies that offer a mild hydraulic roller cam for a 5.0L Ford. A LOT of them do it these days. 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. Posted on May 07, 2014 by promarengine. Come join the discussion about popular models such as the Mustang, Galaxie, Falcon, Fairlane, Torino, Shelby and many more! Because of this, your tuneup will probably need to be modified. This is needed for the steel roller cam. bmcdaniel, Feb 17, 2004 #7. v8maverick Member. A bone stock 2bbl early 351w with stock replacement forged pistons (9.0 compression) and dyno headers made 211 Hp . 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. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. Your email address will not be published. There are a couple of reasons for this suggestion. That's fantastic for the minimal investment we made. 1983 Mustang G.T. Definitely going to use my P heads. If you dont feel comfortable doing this higher a pro. You could run a thinner head gasket as well. As a matter of fact, Central Coast has an '89 coupe with GT-40P heads that has run a best of 11.98 in the quarter-mile. GT40P Heads how much hp from them. - StangNet 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. I have to agree, the GT40P heads flow better than the GT40 iron heads. the springs are new stock oem ford. Assorted screwdrivers, pliers and vise-grips. You can have your current 28 oz rebalanced to 50. I don't need tons of power to enjoy the car. GT 500; Posts: 8496; Location: Brisbane . If you wanted to make your engine feel strong, these would be a decent investment, but they will require some modifications. Mac and Ford Motorsport both make a GT40P spacific header. Slover primarily focused on the exhaust side of the GT40P heads. 99 Explorer engine (302) with GT40P heads - Ford Muscle Cars Tech Forum