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350 compression check

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by scotty1, Jan 27, 2002.

  1. scotty1

    scotty1 1/2 ton status

    Jan 7, 2002
    Likes Received:
    WV, Harpers Ferry
    What is the satisfactory range of pressure for a 350 SB. The motor I am looking at is a 91 TBI with 134K. Thanks for your input.

    Git there fastest with the mostest!
    Nathan Bedford Forest
  2. shawnboy

    shawnboy 1/2 ton status

    Jun 22, 2001
    Likes Received:
    Toronto, Canada, eh.
    You should be around 150psi with a maximum variance of 20psi.

    <font color=red>If you are having too much fun it's probably illegal.</font color=red>
  3. now is that for a brand new motor. i always thought it was more important- on a used motor -that all the cyclinders were showing the same compression (with in the range you stated). this way at least you would know things are wearing evenly and there are no dead cylinders. some of my used mills have shone 110-125 across the board and ran fine.

    <font color=blue> Experience enables you to recognize a mistake when you make it again.

    </font color=blue>

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