which heads to use on a rebuild.....

Discussion in 'Street/strip 400/430/455' started by Rob72GS, Jun 3, 2020.

  1. Rob72GS

    Rob72GS Well-Known Member

    i have the following heads, both rebuilt with the same valves, springs etc... no head work, no porting or polishing all stock.

    first set 1238148
    second set 1231786

    Thanks
     
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    The 1231786 are 70 heads. The other set are 1972 heads. The 70 heads have slightly smaller combustion chambers. (69cc vs. 71cc) I'd use them.
     
  3. hugger

    hugger Well-Known Member

    The 86's with Cometic .027 gaskets will provide the best possible compression
     

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