Hey there, who knows the why-fore of 348 Chev crankshaft flanges being different? Is it a car vs truck thing, or maybe a year thing? One has a notch, one is solid round. Just trying to figure out if there is any significant meaning to this or not. (hopefully my pic will load)
I wonder if either are W-motor cranks? Reason I say that, is because the old B & M Hydro-Sticks neexded to have the flywheels machined to clear "balance weights", just like 327, 350 cranks have a balance weight (big blocks also). Like another HAMBER said, casting numbers? I am Butch/56sedandelivery.
In the 348 era Chevy used forged cranks exclusively, it was later (1963?) when cast cranks started to show up in some 283’s. Also, in the six cylinder engines and even the Chevy II four banger there were cast and some forged cranks.
Yeah, aside from the flange they are both identical. Just odd that we suddenly noticed the difference in the flanges after all these years.