Heads Question ?

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Jul 15, 2007 | 07:34 PM

Corvette-Chris

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Le Mans Master

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From: Shreveport/Bossier Louisiana

St. Jude Donor '08

Heads Question ?

I have the G5x3 cam already with supporting mods and was looking at heads. My question is would the Patriot Stage II LS6 style heads with 2.02/1.57 valves and a 59cc chambers work well with what I have without flycutting ? Thanks

Chris

Jul 16, 2007 | 11:50 AM

JagTech

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From: Savage, Minnesota

That would be a good question to ask LG. I have the G5x3 as well with stock heads that are ported polished and shaved to a 59cc chamber and I had to flycut. Flycutting is actually kind of easy, a little nerve racking, but I did it in my garage. Good luck with the head choice.

Jul 16, 2007 | 12:36 PM

AU N EGL

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From: Raleigh / Rolesville NC

with a 59 cc chamber you will need or should fly cut too assure clearnce

Jul 16, 2007 | 12:46 PM

02gt350

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From: East Peoria Illinois

I have stage II PG heads, and i DID NOT have to fly cut, but i do have a smaller cam than you

Jul 16, 2007 | 03:59 PM

SLO C5

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From: Are you fat because you're lazy or lazy because you're fat? San Jose, CA

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St. Jude Donor '09

If it's on a 112 I think you have to flycut if the heads are milled all the way down to 59cc. Best to call LG and ask.

Jul 16, 2007 | 04:30 PM

Y2Kvert4me

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From: Gone

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St. Jude Donor '03

Quote:

Originally Posted by AU N EGL

with a 59 cc chamber you will need or should fly cut too assure clearnce

In this case, the chamber size is irrelevant...but it's the oversize valves that will reduce clearance.

Patriot LS6 "style" heads are actually 6.0l heads that have had the chambers welded up to reduce chamber volume. Since the head isn't milled to achieve that smaller chamber size, it doesn't kill p/v clearance.

Even if the OP's cam is on a 114 lsa, I still think flycutting would be needed/highly recommended with those larger valve sizes, and definitely if a thinner head gasket was to be used.

As said above, flycutting is no big deal, I did mine too. I wouldn't let that procedure keep me from getting the optimum compression ratio and maximizing the ipotential of the heads/cam.