Gt40p's and E303 cam

[justhereforinfo]

Im about to install a set up GT40p heads. I'm currently running an E303 cam, I have no idea what heads are in the car, but their cast iron and suck, so im not sure of the valve train and wouldnt be supprised if the springs dont match the cams lift. (new car)

I believe the E cam has a .495 lift. If so, is that too much for the GT40p's springs?

I can get a set of 1.6 roller rockers, will that help? Or do I need new springs to run this combo?

 

[cenok is family]

E cam has .498 lift. if your heads are cast iron, they're probably just stock e7's. if you just pulled the heads from an explorer, they have either .450 or .500 lift springs, i can't remember. either way, i'd swap them out with a better set because you'll be running them to their max. factory stamped rockers are 1.6 as well, so it wouldn't change anything with your lift.

 

[Mustang5L5]

I keep promoting this combo because I think it's a great budget combo

GT-40P's with TFS upgraded valve springs

TFS stage 1 cam

 

[justhereforinfo]

Do you have a link?

 

[justhereforinfo]

Like this?
VALVE SPRING UPGRADE KIT, SMALL BLOCK FORD WITH OE STYLE CAST IRON HEADS MUSTANG

 

[TomCat]

Might as well check the heads you've got for any common casting marks, just to be sure. If they're the E7s, you'll love the switch to the Ps
Like people have said, grab the upgrade valve spring kit from TFS, better safe than sorry.

 

[85_SS_302_Coupe]

I keep promoting this combo because I think it's a great budget combo

GT-40P's with TFS upgraded valve springs

TFS stage 1 cam

I think this is like the 3rd time i've come in and seconded this statement


I've heard that even the stock Explorer cam is "too much" for the stock springs.

 

[justhereforinfo]

Everyone keeps saying "stock springs". Are the Gt40p springs the same as the stock E7's springs?

What kind of markings would I find on stock heads? Or how would I tell what these are?

 

[85_SS_302_Coupe]

Everyone keeps saying "stock springs". Are the Gt40p springs the same as the stock E7's springs?

What kind of markings would I find on stock heads? Or how would I tell what these are?

Well, even if they are the same (which i'm almost certain they're not) as E7's, you don't wanna run any kind of cam with decent lift on them anyways. The stock Mustang cam is .444 lift, and i'm willing to bet the stock valve springs are just addequite for that cam. The Explorer engines weren't put together for high RPM, they were built for torque to move the big slug around. The way i see it, people get valve float with aftermarket cams on stock Mustang springs, and you know the Explorer springs can't be any better.

 

[justhereforinfo]

Thanks guys, I'll go with this combo and let you know the results in a few weeks.

 

[Mustang5L5]

Here's the cam

ROLLER CAMSHAFT, TRACK HEAT - 5.0L/5.8L STAGE 1 MUSTANG


And you have already listed the springs which i beleive work onthe GT-40P. I know they work on E7's as i installed a set.


Gt-40P's, TFS Stake 1 cam, an intake manifold and 65mm TB and supporting mods is a nice little capable combo.

Remember you will need P-specific headers as well. The FMS headers are a great header to run

 

[Mr. Rustypwnz]

Everyone keeps saying "stock springs". Are the Gt40p springs the same as the stock E7's springs?

What kind of markings would I find on stock heads? Or how would I tell what these are?

no P heads max out around .450 lift, get either the tfs spring kit or the crane kit, they both kick ass..

ive had a p head/bcam/explorer intake combo and it ran very hard to say the least, 20mpg and would beat a stock ls1 with a good driver.. I think I had like under $500 in it..
awesome power for the money!!

 

[Joe Jr.]

Good info. guys! I just bought some P's also, and have been contemplating the trick flow cam and springs. I have to work over the heads a little at least tho and the cobra manifold......i can hardly wait..

 

[justhereforinfo]

Will these rockers work with my setup? Are they interchangeable?





Stock Gt40p's




I'll be using a TFS stage 1 cam(.510 lift), TFS spring upgrade (.542 max lift), these 1.6 rr's, and Gt40p heads. Along with all the other usual bolt ons and a 130ish wet shot. Sound good?

 

[RYC CUKR]

I run a GT40p/TFS1/Track heat intake combo in my 93 along with a set of 4.10s. With a AOD with only a shift kit, meaning still running the stock converter, it runs 14.0s@100mph. Keep in mind this a a full weight AOD GT vert. About the heaviest fox body that you can get. Put a 100 shot on it and it goes 12.7s@109.

And I used the TFS spring kit for Ford iron heads.

 

[5.0Torx]

im in pretty much the same boat. i bought an exploder motor from a JY for $350 and am just waiting for the cashflow and mustang-downtime to do the swap!

good luck, lemme know how it goes!