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 Iâ??ve been running
.032 and itâ??s working out great
~Steve
> On Jan 11, 2024, at 9:13â?¯AM, Lorne Fritz via Fot <fot@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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