Only the '63 model year L6 292 had the forged steel crank. After that they were cast. Later models ['67 -'68] had 12 counterweights, thus better balance.
I/I #4101
'71 GMC Jimmy 350, sm465, np205,3.73 posi.
'68 C/10 Stepside 292 (.030 over) Offy Intake, 500 CFM AFB,Clif headers, sm465, 3.73 posi.
'67 K/10 454 project.
'72 K/5 rolling frame project.
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