Hey all, I bought a set of GT40P heads about last year, Came of an explorer I believe. Im just wondering if there worth the investment to fix them up or sell and purchase a different set of heads. They're in pretty rough shape, definitely need to be machined, I would throw new springs, valves, and rods on em ( I think thats all I need?).
After estimating the costs it would be smarter to get a more flowing set of heads...right???

By the way, I dont know if it matters, but I have Cobra ( 93) Intake manifolds.

Let me know what you mustang geniuses think.

 

and I just realized I posted this in the wrong section ... Sorry =/

 

toss them in the river and get some gt 40 heads

 

hey chris message that guy about the tach if u still want it

 

I have GT40P heads on my coupe, Stock bottom end, Cobra cam and rockers, Explorer intake and 70mm TB and so far my best 1/4 mile time is 13.6 @ 98mph on bone stock 4cyl suspension.

Best time I ever got on the factory E7's and factory cam was 14.7 @ 96mph.

 

Throw em into the river?! haha....all because of sparkplug placement?
Miles, do you like the heads or are you regretting buying them. Did you buy them ready to bolt em on?

 

I had some GT40P heads done up by a guy named Thumper. I was going to use them for a project that went away and still have the heads.

But generally, with GT40 heads once you have them machined, ported, new springs and guide plates are not worth the investment compared to a decent aluminum head.

Best thing is to find some dummy that already did all the work to them and buy them cheap.

 

Considering I bought them fully Re-machined for a great price, I'm happy as hell I bought them. for the price vs power, they as the best investment I've made so far. And from the research I did before purchasing them, they make better power on 302's than the GT40s. The big thing that sways guys from them is the plug angle. I have 1.7 roller rockers now, with the cam Advanced 4 degrees. I would love to see what a 1.8 on the exhaust side with the cam retarded a few degrees would do to the car. The other limiting factor is the stock rev limiter, As of now my car continues to pull hard to the limiter, If I could remove it I'm sure I could pull a better time.

Also, those times were with a stock geared rearend, driveshaft, pulleys, air intake (with the crinkle intake tube), mechanical fan, stock injectors and maf. With a 1.85 short time and a 13.6 1/4. Its by far from fast, but I accept that as a respectable budget car. If someone disagrees please say so, I'm always looking to improve with what I have and by no means think I'm a big hitter with these mods.

 

Completely true. Had I not got them for a great price I would have went with an AFR or TFS head. I made that mistake with a set of Vortec 906 heads, by the time I got done with machining, seals, springs, retainers, and locks, I spent the same as I would have on a set of aftermarket aluminum heads.

 

I have a set I got new from Tri-State Cyl Head. $585 delivered. New castings too. Stainless valves, 1.94 I, 1.54 E &. 550 dual springs.

I have ran them for 3+ years. Matched to the right combo and a power adder, they will make enough power to break a stock block!

I made 486 rwhp with no tune and 17 lbs of boost from a Novi 2000.