This is an NOS alternator pulley with numerous applications in 1963-71 corvettes
NOS pulley, in GM box. Box is not sealed
Application:
63-64 FI, HIPO (except w AC)
65 FI, HIPO (except with AC and PS)
66 HIPO (except with AC and PS)
66-68 427 (except HIPO and AC)
69-71 427/454 w/PS and HIPO
NO RETURNS on installed or used NOS parts