Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

comp. ratio ?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Russell Keys, Oct 11, 2001.

  1. Russell Keys

    Russell Keys 1/2 ton status

    Joined:
    Mar 16, 2000
    Posts:
    253
    Likes Received:
    0
    Location:
    Huntsville, TX
    What would be a estimated comp ratio I might expect with a 350 bored .030" with dish 4 valve relief pistons and 58 cc heads?
     
  2. Blazer1970

    Blazer1970 1/2 ton status

    Joined:
    Feb 17, 2000
    Posts:
    1,600
    Likes Received:
    0
    Location:
    Old Mission, MI
    10 - 10.5 : 1

    Tim

    70 Blazer CST 4X4 350 SM465 NP205
    87 Burb 4X4 350
    01 GMC 2500HD 4X4 Duramax/Allison
     
  3. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

    Joined:
    Jun 16, 2000
    Posts:
    1,932
    Likes Received:
    0
    Location:
    Sims, NC
    If the pistons are dished with 4 valve reliefs, you are looking at about 9.4:1 depending on head gasket thickness. If your pistons just have the 4 valve reliefs, then you are talking around 10.75:1

    '85 K5 : Run it til it breaks, then fix it and go again!
     

Share This Page