Re: Nos ZL1 Cam
Only the very early ones had 9181. Later cams after 1975 had the full part number. 1990's cams had the full part number and casting number stamped on the end (891197) and there are 2 other types of stampings I have seen. 
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1962 Oldsmobile Jetfire, Factory all Aluminum V8 Turbocharged and Methanol Injected TURBO ROCKET engine, 4 speed Hydramatic, 4 link rear suspension, 3.36 Anti-Spin differential, California car, PS, PB, PW, AC, Jetfire 2 option package.
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