The AERA connecting rod reconditioning manual I use also does not list a length on GMC six rods. When I ran the connecting rod reconditioning department of a big automotive machine shop in Nashville Tennessee back in the late 1990s, we always used 7" as the standard dimension for those rods. Same length as flathead Ford V8 rods, BTW!
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!