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Need Head Info

This is a discussion on Need Head Info within the Internal Engine forums, part of the LSx Technical Help Section category; Does anyone have any info on Casting # 12551561? Is it worth putting money into? Will it work with old ...

  1. #1
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    Need Head Info

    Does anyone have any info on Casting # 12551561? Is it worth putting money into? Will it work with old style manifold? Is it reverse flow? HELP

  2. #2
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    Quote Originally Posted by Maxgraphix View Post
    Does anyone have any info on Casting # 12551561? Is it worth putting money into? Will it work with old style manifold? Is it reverse flow? HELP
    Casting number 12551561 is an aluminum LT1 head. By definition it is reverse-flow. It requires an LT1 manifold or a substantially modified early manifold. The runner spacing is the same but there is a difference in the location and angle of the innner manifold bolts. Only the four corners are interchangeable.

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