What's the proper clearance Piston-Head??
09-21-2010, 08:14 PM
#1
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What's the proper clearance Piston-Head?? hey, I got a 6.0L LQ9, Piston, rods and crankshaft is stock, these are cam specs: lobe lift exh=367 int=363 duration @ .050 int=231 exh=239 lobe separation=113.
RC=11:1 converter=3000 RPM
this is carburated: holley vacuum 675
heads 243 casting, valve train full roller.
The clearance piston-head in my engine is .035" but I dont want to take any risk, should I make it bigger or is it ok???
RC=11:1 converter=3000 RPM
this is carburated: holley vacuum 675
heads 243 casting, valve train full roller.
The clearance piston-head in my engine is .035" but I dont want to take any risk, should I make it bigger or is it ok???
09-22-2010, 09:29 AM
#3
Are you actually asking about piston to head clearance, or piston to valve?
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09-22-2010, 11:04 AM
#5
Piston to head (basically the same as quench) is ideal around .035-.040" on these engines.
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09-26-2010, 10:26 PM
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Ive seen as tight as .027 but it was by previous builders mistake and was lucky. .035" is the minimum target clearance to shoot for. I usually zero the piston with the deck of the block and the headgasket thickness be the amount I want.
