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Thread: piston to head clearance

  1. #1
    Member JUNIOR BUILDER
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    piston to head clearance

    on a steel rod big block chevy what is the minimum piston to head clearance?

  2. #2
    We, JE, Reccomend min .040 between the piston and head

  3. #3
    Senior Member RACING JUNKIE curtisreed's Avatar
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    Quote Originally Posted by ARUSSELL
    We, JE, Reccomend min .040 between the piston and head
    Wouldn't you need to know how big the bore is to give a solid answer on this? Piston rock could come into play depending on just how big of and engine he is building right?

    Curtis

  4. #4
    Member JUNIOR BUILDER
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    piston to head clearance

    engine is 468 4.310 bore.

  5. #5
    Senior Member RACING JUNKIE
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    I think doorracer is right if you run a good forged piston you need atleast .005/.006 clearance and you have to consider the rock of the piston. JE's recommendation of .040 is a safe one with "0" deck ht., the last 468" i put together i used .039 Felpro gaskets and it has 2618 flattop forged pistons with .0065 clearance. I put that much clearance in the motor because the owner wanted to be able to spray a 250 shot of nitrous. It's a pump gas motor and runs 6.80's 1/8 mi. no spray in a 3700lb street car.

    JMO

    Zip.


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