P/V clearance ????????
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From: Seabrook, TX
P/V clearance ???????? I have GMPP LS6 60.7 cc heads on my car and want to swap my FM11 which the specs are, 228/230 .591/.581 112 lsa. to a FM13 which the specs are 230/232 .595/.583 112 +4 lsa. on this particular one. I think it'll fit without clearance issues, but would like some other opinions rather than screw my engine up.
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From: Seabrook, TX
Originally Posted by KingCrapBox
That ****'ll fit with stock valves.
It's gonna be real tight , how much have the heads been milled? What you need to do is get the valve seat to piston clearance at TDC as measured with a dial indicator. Multiply the lobe lift at TDC by the rocker ratio of 1.7 and deduct that figure from the valve drop number and that will give you clearance at TDC. Claying is still necessary, as is checking clearance with a soft spring at 8* ATDC on the intake.
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Verdad Gallardo Something doesn't jibe here stock unmilled LS6 headsusing the graphite gasket give 64.4 CC. I'm putting in a CC 288/239 .588/.591 112+2 and only have .045 clearance at 8*ATDC must flycut.
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From: Seabrook, TX
Originally Posted by bigdsz
All I know is when I cut the clay for measurement yesterday afternoon, I knew my new cam wouldn't fly without notching.I need piece of mind.