12-10-2020, 05:48 AM
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Ultimate Warrior
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Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 5,481
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I have found factory 1969 #48 heads has the same size chambers as the 66-67 cc 1970 #12 heads.
After 50+ years of usage, valve jobs and decking these figures may differ.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
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