The 4242S uses a 11/16" diameter and 2.290" long pump, same as all 1966-67 Pontiac AFB´s except 1966 326 engines.
Doesn´t hurt to put a couple of engine oil drops on the leather shirt at install and expand shirt some as Jon said..
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1966 GTO Tri-Power
1970 GTO TheJudge
http://www.poci.org/
http://gtoaa.org/
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