Your #3829387 Alt. pulley has an outside diameter of 3-5/8",and a shaft Dia. of 4-3/64",with a 1/2" wide Deep belt groove.
Was used on:
1965-66 Impala series w/spcl.Hi-perf 396.
1966 Chevelle w/spcl.Hi-Perf 396.
1967 Camaro w/302.
More sought after Alt. Pulley #1970831 has an outside Dia.3-3/16".shaft Dia of 11/16" with a 1/2" Deep belt groove.
No identifying numbers were stamped into this pulley.
Was used on:
1969-70 Chevelle w/solid lifter 396,454
1969 Impala series w/solid lifter 427
1969-70 Nova w/solid lifter 396
1969 Camaro w/solid lifter 302,396,427~COPO
1970 Camaro/Nova w/LT-1 350
Last edited by Mr70; 08-07-2020 at 04:42 PM.
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