Is This Cam Too Big

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Feb 6, 2006 | 08:58 PM

killaz

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Burning Brakes

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From: Portland Oregon

Is This Cam Too Big

Will i have to cut the pistins running a 236/244 .625/.635 114lsa ish cam?

Thanks

Feb 6, 2006 | 09:07 PM

Z06ufgrad2002

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From: Melbourne FL

I would almost guarantee it.

Feb 6, 2006 | 09:08 PM

Y2Kvert4me

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From: Gone

CI 6-7-8-9-10 Veteran

St. Jude Donor '03

Possibly.

What heads? What valve sizes? Have the heads been milled? What's the lobe profile like?

No matter what, PtV clearance should be checked upon installation, even w/stock heads....a cam of this spec is way too close for anyone to give you a definite yes or no answer.

Feb 7, 2006 | 06:33 AM

vettenuts

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From: At the beach in little Rhody

Too big for what?

Feb 7, 2006 | 07:12 AM

AU N EGL

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From: Raleigh / Rolesville NC

Never tooo big

but with a lift greater the .600 you may have to cut your pistions. very very close and it also depends on the heads your using.

Feb 7, 2006 | 11:58 AM

killaz

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Burning Brakes

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From: Portland Oregon

Im Going With Stock Heads. Of Course Upgraded Springs Andwhat Not, But Stock Heads.

Feb 7, 2006 | 12:20 PM

greg_nate

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Quote:

Originally Posted by killaz

Will i have to cut the pistins running a 236/244 .625/.635 114lsa ish cam?

Thanks

My exhaust is .609 lift, and there was enough piston to valve clearance on my patriot head. I am not sure of the PP heads, but I am fairly certain that they are not milled...they get their compression from the way they do the valve chamber.

Anyway, my tuner (rwj383 on here) actually looked inside the cylinder during the cam install, and found there to be ample room between the piston and valve. He was a little concerned at first, and was planning on making cutouts in the cyl head, but it turns out he didn't have to.

However, those specs are a good size higher than mine. You oughtta PM directly some tuners on here, Robert being one of them, to make sure. Even if it was too close, it seems you could cut piston reliefs. Its just extra labor involved.

Please keep us posted.....

greg

Feb 7, 2006 | 12:23 PM

ArKay99

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From: Cape Coral FL

Quote:

Originally Posted by killaz

Im Going With Stock Heads. Of Course Upgraded Springs Andwhat Not, But Stock Heads.

As far as cams go, duration, LSA, ICL, and lobe profile play a bigger role than lift in determining P/V clearance. As far as heads go, milling, gasket thickness, valve height, valve size, and piston deck clearance determine P/V. When you mix all those variables you can see you have a lot of parameters determining P/V clearance. The easiest and only way to know for sure is to determine it as stated above.
If you want a guess, I would say yes, you will. I believe that cam is larger than a G5X3 on a 114lsa, and I've read here that is about the largest cam you can go with on stock heads.
BTW. as also stated above you can cut them fairly easily. You just have to take the heads off and use a cutting tool. Either make your own from an old valve or you can purchase the Isky cutters.
I did it on mine, see my sig. I cut .065"-.070" and ended up with .135"-.140" clearance. I was too close without cutting, due to the head gaskets, milling, and ICL.

Last edited by ArKay99; Feb 7, 2006 at 12:27 PM.