They where a strange Head as where many from late 72 - 73 other then the 455SD head.
Fior some dam reason Pontiac reverted back Exh port wise to there first V8 heads in the mid 50's where the center Exh port divider from the head bolt on out to the flange is missing/ not cast into the Head, which sucks for Exh flow!
In short they make for them being a grocery getter Head, or a good door stop or paper weight!
Last edited by steve25; 10-14-2019 at 09:39 AM.
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