Stock Pistons or not?

Discussion in 'Engine Topic' started by Powers76, Apr 17, 2009.

  1. Powers76

    Powers76 Veteran Member

    405
    0
    Jan 28, 2008
    Salem, Oregon
    I just took the heads off my 350 and wasnt sure if these are stock pistons or not. I tried searching online but all i could find for stock 350 pistons were flat tops with 4 valve reliefs so for anyone that has tore apart a 350 do these look stock?

    [​IMG]
     
  2. K5JMP

    K5JMP Veteran Member Lifetime Gold Member

    if it was a late 60's thru about 73 original build.. mebbe.. but I doubt it.
    has been a long time since pop-ups (domed pistons) were a factory item.

    look for a number on the top of the piston... will be tough to see as the carbon may have filled it in.

    I will say it looks waaaay loose in the bore:eek:
     
  3. sooner

    sooner Veteran Member Lifetime Gold Member

    1,414
    0
    Mar 11, 2009
    Perry,Ok
    Look like .100 domes to me.
     
  4. Powers76

    Powers76 Veteran Member

    405
    0
    Jan 28, 2008
    Salem, Oregon
    i actually was able to get the numbers and it said 7002P on the bottom part of the piston and 030 on the top so what does that indicate?
     
  5. K5JMP

    K5JMP Veteran Member Lifetime Gold Member

    .030 overbore.. and found this with google...
    http://www.nastyz28.com/forum/archive/index.php/t-43908.html
     
  6. Powers76

    Powers76 Veteran Member

    405
    0
    Jan 28, 2008
    Salem, Oregon
  7. warped

    warped Veteran Member Lifetime Gold Member

    A 0.030 overbore means that the cylinders were scored or perhaps out of round at some time in the past. To remedy this, the original bore (4.000) was increased by 0.030. This requires a larger diameter piston and if the stroke remains the same, the engine displacement is now 355. Good luck.
     
  8. Powers76

    Powers76 Veteran Member

    405
    0
    Jan 28, 2008
    Salem, Oregon
    well this engine is just full of surprises. so the domed pistons were probably put in to keep the compression ratio close tithe same right?
     
  9. K5JMP

    K5JMP Veteran Member Lifetime Gold Member

    speed-pro's are as good as any... and better than a lot of them;)
     
  10. warped

    warped Veteran Member Lifetime Gold Member

    Are you sure the engine was originally a 350? It almost sounds as though it is a mid 60's era 327. Post up some casting numbers and dates and we can determine the origin of the engine.
     

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