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Thread: Piston to head clearance

  1. #1

    Piston to head clearance

    On a 620" BB Chevy is .045-.050 enough piston to head clearance with steel rods.The bore is 4.560.Thanks

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Jan 2006
    Location
    La.
    Posts
    2,890
    I think so with steel rods, i've run .010 out with steel rods an a s/blk. I've got a blown alcohol s/blk with alum. rods and i'll be running .030 down with .052 gasket due to more clearance and piston rock on inital fire up.
    I do build the engine so i can run a little happy juice (nitro) 10/20%) atmost.

    JMO

    Zip.

  3. #3
    Senior Member MASTER BUILDER
    Join Date
    Dec 2003
    Posts
    185

    Re: Piston to head clearance

    Quote Originally Posted by lmchevy
    On a 620" BB Chevy is .045-.050 enough piston to head clearance with steel rods.The bore is 4.560.Thanks


    Just make sure you will have room for piston rock ....If everything is new you will be good, but if it's been puff honed a time or two be careful

  4. #4
    Senior Member RACING JUNKIE
    Join Date
    Sep 2007
    Location
    Belleville, IL
    Posts
    658

    Re: Piston to head clearance

    Quote Originally Posted by lmchevy
    On a 620" BB Chevy is .045-.050 enough piston to head clearance with steel rods.The bore is 4.560.Thanks
    That's enough clearance for aluminum rods as well.

    We run ours .010 in the hole, with a .050 gasket (MGP alum rods).
    -WJ Birmingham

    OneBadGMC.com

  5. Racing Junk


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