Dan, This GM alternator is the 12SI series began service in 1983 GM products and use metric hardware for mounting. Weight 11.2 lbs. After-market version in excess of 140 Amps and chrome versions.
I have had mine in operation for 6 years, no problems.
P/N 1101307, 66 Amps, 23 Amps@1600RPM
P/N 1101345, 78 Amps, 23 Amps@1600RPM
P/N 1101308, 94 Amps, 32 Amps@1600RPM
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