Thread: 291 Head Differences
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Old 10-03-2009, 02:16 AM
SuperNovaSS SuperNovaSS is offline
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Default 291 Head Differences
I have 2 3964291 rectangular port heads. Both are cast D 23 70. The strange thing is the heads have "HI PERF" cast into them. This may be common but I have never noticed it before. Here is a picture of what I'm talking about:




Jason
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