Quote:
Originally Posted by Cdncarnut
The Aluminum Head 396 was not available in '67, so it would not be legal.
The first year for this option was 1968.
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The GMPP 401 aluminum head is the replacement for the cast iron closed chamber rectangle port heads of that era. There is a HP penalty on the factor for them. They started out at 10HP above the original cast iron head several years ago. So, yes, they are legal, and found both in the classification guide and the blueprint guide.