What's the proper clearance Piston-Head??
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TECH Apprentice
Joined: Aug 2010
Posts: 333
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From: Mexico
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???
Are you actually asking about piston to head clearance, or piston to valve?
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Piston to head (basically the same as quench) is ideal around .035-.040" on these engines.
__________________
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
Largest Stocking Distributor of LS-x Engines / CHECK OUT OUR NEW WEBSITE!
COMP - FAST - PACESETTER - DIAMOND RACING - EAGLE SPECIALTY PRODUCTS - CALLIES - COMETIC GASKETS
RAM CLUTCHES - MOSER ENGINEERING - KOOK'S HEADERS - ARP - GM BOLTS AND GASKETS - MSD - NGK
POWERBOND - ASP - AND MORE!
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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.
