602 crate engine, replace piston?

Discussion in 'Engine Topic' started by Eliminator SS, Jul 22, 2020.

  1. Eliminator SS

    Eliminator SS Veteran Member Lifetime Gold Member

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    Should I replace this piston or run it? OR replace all pistons with forged ones? 20200721_212411.jpg 20200721_212401.jpg
     
  2. biker

    biker Veteran Member

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    What the heck you do to it? Did u lose a head gasket? What's your induction? Naturally aspirated? Any nitrous? I know you said crate motor, but have you changed the cam? Compression? RPM range?
     
  3. Eliminator SS

    Eliminator SS Veteran Member Lifetime Gold Member

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    It's an ex imca 602 crate engine
    Finished its last race in the top 5 even with that hole in the valve. I'm guessing something from the carburetor came loose and went through the engine.
    I'm installing a 480 lift cam that was suggested by a few different Vortec guys and will be keeping the compression as close to 9.5-10 :1 as possible even if I replace the pistons. It's going to go into my 79 Z28. Just a nice little hot 350.
     
  4. 1980RS

    1980RS Veteran Member

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    If you are going forged, make sure you have the right piston to wall clearance. Cast pistons will be tighter and forged may scuff without the proper clearance.
     
  5. dcozzi

    dcozzi Veteran Member

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    Looks like whatever went into the cylinder went right out the exhaust along with that piece of valve. The piston and cylinder wall look good from what I can see in the pic. I would fix the head/valve and run it.
     
  6. G72Zed

    G72Zed Veteran Member

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    If you run the same pistons, just make sure you did not pinch the top ring on that piston from that piece getting hammered by the piston.




    Inked20200721_212411_LI.jpg
     
  7. dcozzi

    dcozzi Veteran Member

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    Man, I really need to start wearing my glasses.
     
  8. biker

    biker Veteran Member

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    Me too I guess.
     
  9. Eliminator SS

    Eliminator SS Veteran Member Lifetime Gold Member

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    The plan I've decided on is to pull all of the pistons, give the cylinders a quick hone, clean and inspect the pistons, and reinstall with the original pistons and rings if they aren't damaged.
     
  10. G72Zed

    G72Zed Veteran Member

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    Good plan, at least you will know if that piston took a hit, better safe than sorry, and your 1/2 way there anyway. Hope everything works out for you.
     
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