Valve to Piston Questions

Discussion in 'PSI Superchargers Tech Questions' started by Mike Canter, Apr 4, 2004.

  1. Mike Canter

    Mike Canter Top Dragster
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    What is the minimum safe piston to valve clearance on a blown hemi motor for both the exhaust and intake?

    Also, since the valves and the valve pockets in the pistons are at such an angle on a hemi what does changing the head gasket thickness by .010" do to this piston to valve clearance? I am guessing that it only changes it by half the amount. Does anyone know for sure? T
     
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    Mike Canter, Apr 4, 2004
  2. Ken Sitko

    Ken Sitko Super Comp

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    I like to have at least .125" clearance on the intakes, and lots more (I run .250") on the exhaust because the valve and piston are going in opposite directions. Don't know what the minimum exhaust clearance is though. You'll have to get the calculator out to figure out your geometry for the head gasket change.
     
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    Ken Sitko, Apr 5, 2004

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