Question on 302 with GT40P heads, and 1.7 rockers; I want a cam now

[shane96ranger]

Sorry, Mustang question here; but I know some of you have close to the same set-up I do. My 302 has GT40P heads and 1.7 roller rockers (OEM 93 Cobra). I can get my hands on a new E303 for roughly 150 dollars. Has anyone done this exact set-up? I'm just wondering if I need to worry about clearance with an E303. I also would like some suggestions on valve springs. Or heck, I'd even entertain a different cam if you now of something better in the same price range.

Thank you, TRS rocks!

BTW, I'm in my parts gathering mode again

 

[Teddyzee]

Been done many times.

It never hurts to check piston to valve clearance anyway.

Trick Flow makes a set of valve springs specifically for this, but the specs for the cam will steer you toward the proper springs.

http://www.fordracingparts.com/download/charts/85.pdf

Remember, multiply the lobe lift by 1.7, not the 1.6 that is shown.

 

[baddad457]

Definately check the piston to valve clearances. It's not just the lift that affects clearances, but the timing events too. And check for coil bind.

 

[bearsrngr]

I'd be interested in you'r cobra cam if you want to part with it?

 

[shane96ranger]

OK, really dumb question. But I've never done or seen PTV clearance checked before, so I don't even know what would be involved. What do I need to do? I imagine there's a tool for this? I wouldn't mind owning another tool =). I would rather do all of this without taking the heads back off the car. I don't want to buy new heads bolts, and gaskets again if I don't have to. I'm going to get one of those tools to keep the valves up with compressed air when I do the valve springs.

THANK YOU!

 

[shane96ranger]

I'd be interested in you'r cobra cam if you want to part with it?

I actually have 93 Cobra 1.7 roller rockers. As far as I know, there was no difference with the cam on the Cobra (93-95) and regular HO motors.

EDIT: Well, I'll be damned. They were different. They weren't exactly performance oriented though.

 

[fordmike1]

Sorry, Mustang question here; but I know some of you have close to the same set-up I do. My 302 has GT40P heads and 1.7 roller rockers (OEM 93 Cobra). I can get my hands on a new E303 for roughly 150 dollars. Has anyone done this exact set-up? I'm just wondering if I need to worry about clearance with an E303. I also would like some suggestions on valve springs. Or heck, I'd even entertain a different cam if you now of something better in the same price range.

Thank you, TRS rocks!

BTW, I'm in my parts gathering mode again

Its always a good idea to check the P2V clearence so you know what you have. I have done that same build twice with stock Mustang fordged pistons and didnt have any problems with P2V. Its should work just fine for you.

 

[shane96ranger]

Its always a good idea to check the P2V clearence so you know what you have. I have done that same build twice with stock Mustang fordged pistons and didnt have any problems with P2V. Its should work just fine for you.

Did you install the cam straight up, or did you advance it at all?

 

[bearsrngr]

I actually have 93 Cobra 1.7 roller rockers. As far as I know, there was no difference with the cam on the Cobra (93-95) and regular HO motors.

EDIT: Well, I'll be damned. They were different. They weren't exactly performance oriented though.

Oops, I forgot about the crazy lobe centers on those guess I'll stick with my exploder cam.

 

[fordmike1]

Did you install the cam straight up, or did you advance it at all?

Yes the cams were installed straight up on both. I didnt degree the cams on either engine so I am not sure if they were advanced or retarded form the factory.......

 

[cammeddrz]

OK, really dumb question. But I've never done or seen PTV clearance checked before, so I don't even know what would be involved. What do I need to do?

i have done this many times, here is how the lay person can do it easily: go to wal mart and get a couple eggs of silly-putty from the toy-aisle. as you are assembling the engine:
1) install the cam

2) pack the silly putty onto the face of a piston at least 1/4" thick

3) then bolt 1 head on with a gasket, and torque it (just to be safe)

4) install pushrods and rockers for that cylinder and set the valve lash

5) rotate the crank 4 times (thats 2 rotations of the cam)

6) take the head back off

7) take a razor blade and cut the putty where the valve(s) (usually just the ex valve) indented in a few places to find the thinnest part, measure the thinnest part

that measurement is your p2v clearance, if the clearance is 1/16" or smaller i suggest doing it all again but with plasti-gauge to get a more precise measurement. but with that combo i seriously doubt it will be that thin

 

[baddad457]

Oops, I forgot about the crazy lobe centers on those guess I'll stick with my exploder cam.

All three cams (HO, Cobra & F4TE) are extremely close in specs. In swapping the F4TE for a Cobra cam you'd have to dyno both to see the difference in output. The 1.7 Cobra rockers give the F4TE more lift (.422/.445 up to .445/.473) and a 15 horse boost.

 

[bearsrngr]

All three cams (HO, Cobra & F4TE) are extremely close in specs. In swapping the F4TE for a Cobra cam you'd have to dyno both to see the difference in output. The 1.7 Cobra rockers give the F4TE more lift (.422/.445 up to .445/.473) and a 15 horse boost.

Yea I think you'r right, the 1.7s will work nicely on the explorer cam. If I realy want notiably more power an aftermarket would be the way to go.

 

[shane96ranger]

i have done this many times, here is how the lay person can do it easily: go to wal mart and get a couple eggs of silly-putty from the toy-aisle. as you are assembling the engine:
1) install the cam

2) pack the silly putty onto the face of a piston at least 1/4" thick

3) then bolt 1 head on with a gasket, and torque it (just to be safe)

4) install pushrods and rockers for that cylinder and set the valve lash

5) rotate the crank 4 times (thats 2 rotations of the cam)

6) take the head back off

7) take a razor blade and cut the putty where the valve(s) (usually just the ex valve) indented in a few places to find the thinnest part, measure the thinnest part

that measurement is your p2v clearance, if the clearance is 1/16" or smaller i suggest doing it all again but with plasti-gauge to get a more precise measurement. but with that combo i seriously doubt it will be that thin

Thank you!

 

[Teddyzee]

The F4TE cam (Explorer ) is listed here, but google it for an easier read.
http://sbftech.com/index.php/topic,28873.0.html