stock comp ratio, what would it be now

Discussion in 'Small Block Tech' started by Myred340, Jul 1, 2003.

  1. Myred340

    Myred340 Well-Known Member

    340's stock compression ratio was 10.25:1. The block was decked 8 thousands heads were shaved 2 thousands i think thats right what would comp, be now and what octane fuel would be right with out any over kill on my wallet thanks josh
     
    Myred340, Jul 1, 2003
    #1
  2. brblx

    brblx clueless

    we'd have to know head cc's, piston dish cc's, and head gasket thickness to get a number.
     
    brblx, Jul 1, 2003
    #2
  3. YellowLark

    YellowLark Well-Known Member

    It sure would not be a fuel that you could buy at a local gas station.

    The 1966 Buick documentation for the 340-4 specifies fuel that would be over 96 octane in today's measurement.

    I have to run a 3:1 mix of 93 gas and 110 racing fuel in order to stop the knocking. Your modified engine would need even more racing fuel.
     
    YellowLark, Jul 2, 2003
    #3
  4. 72skylark

    72skylark 4 Doors of Fury!

    if you used composite head gaskets you actually have less compression now. New composite gaskets are .043 thk, and stock steal shim gaskets are .020 thk....
     
    72skylark, Jul 3, 2003
    #4

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