11-06-2021, 04:59 AM
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Ultimate Warrior
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Join Date: Feb 2003
Location: The Kingdom of Sweden
Posts: 6,097
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ALL 1967 400/428 #670 heads uses 2.11" - 1.77" valves. no such thing as "small valve #670 heads.
NO roundport heads ever on fullsize Pontiacīs from factory.
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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