The Power!!!!! (gt40p question)

Skizza · Oct 24, 2007

Got everything for my gt40p h/c/i except a cam. What kind of gains should I expect? I'm going with p heads, exploder intake, crane race gold 1.6's. I'm thinking a tfs stage 1. Is that the best off the shelf cam for this? Steeda no 18? I dunno, what do you think?

85_SS_302_Coupe · Oct 24, 2007

My buddy's numbers with a 100k+ mile 302, Typhoon intake, X303 cam and GT40Ps made 257hp/292tq at the wheels. The X is a good cam but the TFS1 is a much better cam....anything with a split duration favoring the exhaust will do you a lot of good with those heads.

ttop88 · Oct 24, 2007

I had a anderson n-21 and 1.7rr. No dyno numbers but it did the 1330 in 12.89

Skizza · Oct 24, 2007

any piston to valve clearance issues?

sweetSaleen · Oct 24, 2007

I had those GT40p heads w/matching headers, exhaust, cobra intake, 1.7 rockers, stock cam,pullies, BBK TB-65 or 70mm, stock block rebuild with a clean port on the heads and intake and 373 gears and SPEED DENSITY!!!

No dyno numbers but went to the track 2 days after I had the motor in and tuned.. Went 13.4@ 105 on street tires. Full street car/daily driver at the time. I liked the setup and I got the heads,headers and intake as a package deal from MM&FF advertisement. Local speed shop did the block for me and a buddy put it together for me.

May do something similar with my 87 Gt vert... OR go with a fresh 351 w/ zero miles that is sitting in my buddies garage.

ttop88 · Oct 24, 2007

Skizza said:
any piston to valve clearance issues?

Nope. The cam is made for 1.7s .512 lift

PUNISHER RACING · Oct 25, 2007

I believe Central Coast sells a longblock that has the X cam and P heads in it they list it at 340 horse. The P heads have smaller valves than E7's and an X cam clears on a stock longblock.

Georgie · Oct 25, 2007

gt40p? whats the p for?

PUNISHER RACING · Oct 25, 2007

performance ?

samickguy15 · Oct 25, 2007

PUNISHER RACING said:
performance ?

Either that or it's the change level, but I doubt it. It's probably performance or production. Who knows...

BTW, even though the P heads have smaller valves, they still flow better than the standard GT-40's, E-7's, and '70 Windsors. They are an excellent example of port velocity vs. valve size.

Georgie · Oct 25, 2007

if i go searching in scrap yards..what year explorer did these come out of? and i assume i should get the upper and lower intakes at the same time?..should i also take the cam?

im in the procces of collecting parts for a chepo build with "some" performance, cuz i cracked my block

ninety15.0 · Oct 25, 2007

PUNISHER RACING said:
I believe Central Coast sells a longblock that has the X cam and P heads in it they list it at 340 horse. The P heads have smaller valves than E7's and an X cam clears on a stock longblock.

The P heads do not have smaller valves than the E7's. The E7's have 1.78/1.46 and the P heads have 1.84/1.46 i believe. The regular gt-40 have 1.54 on the exhaust side.

Also never just assume that there will be adequate PV clearence. Its not about max lift its more about duration cams with more duration and less lift have a better chance of kissing a piston than a higher lift cam with short duration. Clay all the way!!

88blacklx · Oct 25, 2007

sweetSaleen said:
I had those GT40p heads w/matching headers, exhaust, cobra intake, 1.7 rockers, stock cam,pullies, BBK TB-65 or 70mm, stock block rebuild with a clean port on the heads and intake and 373 gears and SPEED DENSITY!!!

No dyno numbers but went to the track 2 days after I had the motor in and tuned.. Went 13.4@ 105 on street tires. Full street car/daily driver at the time. I liked the setup and I got the heads,headers and intake as a package deal from MM&FF advertisement. Local speed shop did the block for me and a buddy put it together for me.

May do something similar with my 87 Gt vert... OR go with a fresh 351 w/ zero miles that is sitting in my buddies garage.

Do want to bust your bubble but thats not that much of an accomplishment, changing the cam in a speed density car and having it run without mass air is an accomplishment and it can be done but is a pita. Just changing the heads and intake on a speed density car is easy, its the cam change that makes it hard

85_SS_302_Coupe · Oct 25, 2007

Only the exhaust valve is smaller on the Ps, and it's smaller because the exhaust port has better port velocity so a larger valve is not needed. That said, if they had gone with a 1.90 intake valve they probably could've put a 1.60 exhaust valve to good use.

sweetSaleen · Oct 25, 2007

I never said it was an accomplishment... Just did not feel like switching over to mass air. A buddy of mine put a e-303 cam into his 88 Gt w/SD and did not run into an ounce of trouble, even with the tune.. I found out after the fact and I wasnt about to swap cams.

Car ran well and like I said I may do a similar set up with my 87 Gt vert... BUT this time use the e-303 cam with the setup..

lang williams · Oct 25, 2007

the gtp also has a slightly smaller camber volume for higher compression an relocated spark plug for a more efficient combustion. explorer intake an tb are good to pick up but avoid the cam. its a truck low rpm torque cam.

Foxfan88 · Oct 25, 2007

my friend runs ported P heads and ported cobra intake and a mild cam. it made 260 RWHP i think on a mustang dyno. its a strong running car on the street. really has some pull to it.

RYC CUKR · Oct 25, 2007

My 93 p headed combo is a pretty strong runner. If I can just get some time and get rid of that dang stock stall converter I can finally get some better times out of it. So far best NA pass is 14.0@100 mph with a crappy 2.25 60'. I can't launch it anywhere near its powerband with the stock converter. A new 3000 rpm stall converter and I should be able to squeeze some better times out of it. Not bad for a full weight GT vert AOD car.

85_SS_302_Coupe · Oct 27, 2007

We just had a guy on our local forum dyno his combo, which i don't have all the details yet but when i get'em i'll post them up....he made 292hp and 332tq...that's on a bone stock Mountaineer long block with a stock HO cam and even the stock Mountaineer valve springs, and they said power was dropping hard after 5400RPM so with better springs and a cam this combo should easily pass the 300hp mark. That's pretty outstanding for a junkyard engine.

SuperStang83 · Oct 27, 2007

My buddy had a very similar setup and he ported his heads and ran very high 12's, but with a stock cam I believe.

The Power!!!!! (gt40p question)

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