Crankshaft I-D

Mopar 383 forged crankshaft , has 8 bolt unthreaded rear flange, rear flange sticks out about 1-1/4 " further than 6 bolt crankshaft. What's it from???

Marine?

Fits Passenger car 1959-1961 B or RB engine (depending on stroke). It is for use with a cast iron torqueflight.

The converter has 8 studs that go thru the crank flange and take nuts and lock washers on them. Do you have a FSM from these years? Has photo evidence in there.

That sounds like what i have, it also has a pilot bushing in it.

Crank flange comparison.

Another view

Yep, thats what I took out of a 1969 383 block, I have no use for it .

Hard to find if you need one, hard to find a buyer if you are selling one.

Your crank fits a 1959-1961 361 and 1961 383 only. A 1959 and 1960 383 with that rear flange has a 3.75 stroke like a 413, 426 wedge and 440.

Also note that there is no torque converter ring. The flywheels and flexplates piloted on the outside of the flange.

R.

That is right. There is no flex plate, studs on the converter go through the holes in the crank flange.