However realistically, with the amount of money spent modifying the gt40p heads or even those older 289 & 351w heads, you could have even better performing aluminum heads. Required fields are marked *. 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? 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. that is a healthy budget deal. Install a set of 1.7:1 roller-tipped rocker arms on the heads. GT40p heads peak horsepower was [email protected] with 363ft/[email protected] The worked 351 heads showed peak . They almost seem like flywheel numbers rather than RWHP numbers. 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. Take the assembly to a machine shop to have it balanced and install it in the block. Where they differ is the combustion chamber size. The GTp heads are like GT 40's with smaller combustion chambers and the spark plugs are relocated for a more efficient burn. This modification will help your late-model GT40P heads work better with the old-school carbureted intake setup. 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. Holten runs the factory fan, but he had removed it when he ran the 12.63. 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. Buy the lifters for peace of mind now and hopefully for the duration. 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. These heads have been remanufactured using refaced reclaimed Factory Valves. Sponsored. We did the installation at Holten's place of employment, Motorworks, in Longwood, Florida. I'd much rather be able to drive it at 8 or 9/10s of what it can handle. You didnt mention which cam you had in mind. The factory heads have a boss for the exhaust valve that restricts flow through the exhaust port. 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. I would like to know what heads, cam and intake manifold combination to use for the most HP I can squeeze out of that motor. If you have a early 351W ie pre 76 it probably . Ford Factory 5.0 Performance Cylinder Heads. Cast iron GT40Ps as cast flow better than non-Ps due to revised plug location/angle. I have to agree, the GT40P heads flow better than the GT40 iron heads. 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. Step 2. 97% Positive Feedback . Dec 8, 2011. Not when you can buy a set of Promaxx or AFR Enforcer heads for $1000, that already have decent hardware included. I am very happy too. The gt40p head is considered the best OEM 302 head made. Over $2050 for the 165/185 renegades. You'll have to plug the oil hole that is in the engine from the old oil dipstick. There are too many variables to add to this regarding aftermarket stroker kits or components. Yep my **** is coming apart again Isnt life great! Do you guys have part numbers for the spring kits? You can find them on later model Mercury Mountaineers and several other Ford SUV applications. 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. You will have to get special headers to fit these heads since the spark plugs are angled differently than normal 5.0 heads. I'm also have the regular GT40 heads on my current build. For 2018, the Coyote makes 460 hp. On the power side, we selected 400 hp as an impressive but reasonable output for our small-block 5.0L Ford. K.S. 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. Always the weak area in the 289 and 302 is the tiny 5/16 inch connecting rod bolts and the miniscule intake and exhaust ports. Pretty sure that was name, but I could be wrong. . Compare. All costing in the end at least another $2k. Test 2: Changed to the smaller of the two Lunati camshaftsno other changes. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. 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. never messed with the timing, its at 35* total . $169.50. 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. 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. Small Block Ford 289/302/5.0L/351w 180cc/60cc Aluminum Cylinder Head E42004. 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. I'd get the gt40 setup, and put an s trim on it. JUNKYARD GT40P HEADS-ADD 30+ HP TO YOUR 5.0L (FOR FREE?) These timeslips are from 1280' above sea level. Choose a cylinder head before you install the pistons. GT40, GT40P, would be great factory heads. 1983 Mustang G.T. The multiple-layer steel construction allows the gasket to conform to movement between the cylinder head and block while maintaining a good seal. The "P" heads flow better. The 302 uses smaller 7/16" head bolts and your "P" heads may or may not require the step washers. Come join the discussion about performance, builds, modifications, reviews, engine swaps, classifieds, troubleshooting, maintenance, and more! The asterisk HP differences are calculated using Test 1's 294-hp peak. We also added an Edelbrock Performer RPM dual-plane intake and a set of 158-inch headers with no mufflers. JavaScript is disabled. $700.98. Keep in mind that swapping camshafts is a fairly extensive effort. These are a great head but do need some machining mods to make they really work well. how hard to put on? He'll have to get a gear for his distributor. I have been working on Fords for 40 years and I have experimented with a few tricks of my own. Shop by category. Advanced: Daily Deals; Help & Contact; Sell; My eBay Expand My . Holley 670 street avenger carb. Nudge us with emails, and we'll make it happen. 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 only one that's close, is #7. Anyways, I know the gt40ps will bump . They also have emissions legal heads as well. 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. That's fantastic for the minimal investment we made. As with all head installations, check piston-to-valve clearance before final startup. Maybe I'll think about a cam swap? It turned out we were conservative on both counts. That's a good combo in my book. Every thing he tells you on this site is true. made more power everytwhere and 40 hp is respectable. It's a classic move we've pulled off many times. Holten tells us removing the fan is worth two-tenths in itself, which tells us the fan soaks up roughly 20 hp. Yeah, except those. a) ain't early and b) aren't 289 heads. This will cost additional money but is still worth it, in our opinion. 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! I had a set of 69 302 heads I ran for a while . Over $2050 for the 165/185 renegades. Common sense would suggest that with the heavy lifting complete and the old cam removed, by not installing the new roller lifters along with the camshaft could be asking for the possibility of trouble just a few thousand miles down the road. Cant wait to try um out. I guess I had it backwards, sorry about that, didn't mean to spread misinformation. (its not their engine) The heads got a 3 angle valve job, new valves from speed-pro and all the valve train was from crane that matched the current hydraulic cam. GT40s have 64cc chambers. 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. The Fora platform includes forum software by XenForo. You gave me the info I was looking for, and I really do appreciate it. If I remember right, non of the GT40P's (later models) had the thermactor smog provisions. I went to a couple in Tucson and almost all the Ford vehicles that came with a 5.0 had the heads missing. check out the. The MPH was there to run a little better but the local track is about terrible. Note the head bolt hole issue, some GT40 iron heads had 1/2 holes, if not they will need to be enlarged. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Richard Holdener 240K subscribers Subscribe 63K views 1 year ago WESTECH PERFORMANCE GROUP LOW BUCK, GT40P 5.0L HEADS-CHEAP &. I need that part number too! 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. E303 Cam advanced 4 degrees. I've not seen a set of longtubes that have an issue with GT40P's, either. All this is worth it. #3::: Do your homework,get quality parts,dont skimp. 69.90.139.244 GT40Ps have 58cc. SBF engines are modified constantly. 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. Just make sure it is a roller cam. With the GT-40P heads you will need to back off the timing a couple degrees and bump up the fuel pressure. We know what you're thinking--only two-tenths from an extra 45 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. 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. This one added another 10 degrees of duration over the smaller Voodoo cam, along with 0.020 inch more intake valve lift. Good Luck. Add a distributor designed for a carbureted 302 but make sure to install the correct distributor gear for your cam. Compare. Application Fits 1979-95 Mustang 302/351 w/ OEM Small Block Ford Heads I was looking at putting on the GT40P heads on. this head is complete with new 1.837 int valves and 1.536 exhaust valves. This is an older thread, you may not receive a response, and could be reviving an old thread. 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. 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. The GT40P heads flow a lot better than stock 351 heads. That's more than enough to feed a power-brake booster. You can use the stock roller lifters with any size cam you want. JavaScript is disabled. 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. Yes- thank you. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. . Anythoughts? 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.