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Compression Ratio?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by schwinnd, Jan 18, 2002.

  1. schwinnd

    schwinnd 1/2 ton status

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    I'm wondering what kind of compression ratio and subsequent hp increase I can expect when I get my heads machined next week. FYI, my drivers side head gasket blew last September and I made the mistake of not checking for warpage. [​IMG] Well it went again about 3 weeks ago. [​IMG] I'm hoping it's not cracked but we'll see. It's a stock 350 with an rv cam and an edelbrock manifold.
    Thanks,
    Dave



    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     
  2. zakk

    zakk 1/2 ton status

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    are you having them milled? if so it depends on how much you mill them. you may have to chage you pushrod length if you mill too much...

    -zakk

    '77 1-Ton K5
    World's Ugliest Lawn Ornament
    [​IMG] CK5's Moab 2002 or Bust!! [​IMG]
     
  3. 91K5

    91K5 1/2 ton status

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    The general rule of thumb is HP increases about 4% per point of compression. I.e. if you have 200 hp now with 8:1 you'll have about 208 hp with 9:1.
     
  4. schwinnd

    schwinnd 1/2 ton status

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    Yes they will be milled and thanks for the info I hadn't thought about the push rod length, just learning as I go.....I had kind of figured it wouldn't be that noticable but one can always hope.
    D-

    Just collecting rusty mid-70's chevy's
    1976 Blazer, 1975 Vega SW
     

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