[Fot] Piston to head clearance

[Steven Belfer]

You want as little as necessary because this is where your high CR comes from.  The thickness of the head gasket is the major part of P to H clearance.   I ran .026 P to H clearance at Cal Speedway and the piston kissed the head and I spun a bearing.   My machine shop guy likes .040 for safety but I’ve been running .032 and it’s working out great
~Steve


> On Jan 11, 2024, at 9:13 AM, Lorne Fritz via Fot <fot at autox.team.net> wrote:
> 
> 
> Hi.  In the past I have had pistons hit the head and leave a mark(TR3/4).  What piston to head clearance are most of you running? Thanks in advance,   Lorne
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