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big block square port heads

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  • Chris H.
    Very Frequent User
    • April 1, 2000
    • 837

    big block square port heads

    Are 65 - 69 square port heads physically the same? Could I bolt a pair of 69 L71 heads to my 65 L78. I'm playing "what if" my L78 heads is cracked etc and am concerned about L78 head availablity.
    1969 Riverside Gold Coupe, L71, 14,000 miles. Top Flight, 2 Star Bowtie.
  • grr

    #2
    Re: big block square port heads

    Yes, I did it many years ago. I've installed a set of 454/450 hp heads no problem on the L-78. While your at it get the exh/valves 1.88 installed on the stock 427 heads which have smaller exh/valves. 1.88 are what came on the sqr/port 454/450 hp engines. More hp.

    What heads are you running now GM#3856208, 2.19 intake and 1.72 exh.? I don't see any problems using L-71 heads.grr#33570

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