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Round vs. Square port heads?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Leadfoot, Sep 6, 2002.

  1. Leadfoot

    Leadfoot 1/2 ton status Premium Member

    Nov 28, 2000
    Likes Received:
    Western Massachusetts
    Does anyone know the difference between round and square port SBC heads? I need to order header gaskets (without being able to look at the heads). The heads are pre 87 (not sure if that is the deciding factor or not..... newer style vs. older style). Any help is appreciated.

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