It's Alternator Pulley #1970831 has an outside Dia.3-3/16" and a 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
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