Original Tri-Power idle needles has 1/4" hex heads w/slotted end.
Aftermarket replacement idle needles may never reach the holes to fully close off idle mixture.
Too long springs on idle screws will also prevent the needles from bottoming.
FWIW
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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