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Thread: 307 Decompression Pistons?
          
   
   

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  1. #1
    gte436e is offline CHR Member Visit my Photo Gallery
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    Aug 2009
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    Thomaston
    Car Year, Make, Model: 69 Chevy C-10 307
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    21

    307 Decompression Pistons?

     



    I have read that 307's had decompresion pistons?? What is ment by this and how does it effect the engine?

  2. #2
    tango's Avatar
    tango is offline CHR Member Visit my Photo Gallery
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    I think what they might have ment was Dished Piston's . But that was started on the 1971 307's . The 1968-70 307's Had Flat Top Pistons 9.1 C/R in Stock Form .
    Wisdom is acquired by experience, not just by age

  3. #3
    vara4's Avatar
    vara4 is offline CHR Member Visit my Photo Gallery
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    Dec 2003
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    Pahrump
    Car Year, Make, Model: 1947 International Pick Up
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    They are just a little less compression or dished like tango said.
    Of course less compression means less HP.
    You could get some pop up pistons and pump up your HP.
    I had one of those 307 in a 69 GMC handy Van the engine sat inbetween the front seats.
    I had N50's on the rear end and it would pull wheelies.
    I loved that thing, it would wind up fast. Kurt

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