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Compression / 400 SBC

Discussion in 'The Garage' started by Z3PR, Apr 30, 2002.

  1. Z3PR

    Z3PR Banned

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    Just a question for future ref. : Soon or later I will rebuild the 400 SBC in my 76 Blazer. I've always raised the compression in all my motors. I only run premiem gas (91 oct). How high of compression can I go ??? Will it be good for a 4x4 ??? Most my street cars are around 10 to 1 on pump gas, with no problems.
     
  2. Sandman

    Sandman 3/4 ton status Author

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    I run 10:1 in my 400. I also run a longer duration cam that somewhat helps this. I also run only 91 oct and can get away with around 8 to 10 degrees of timing. When I mud race, I ussually buy a few gallons of racing fuel and run 12 degrees of advance. I also live at an elevation of around 5000 feet. When I drove it to the Californian coast, It started to ping real bad and I had to lower the timing down to get it to run ok.
     

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