Quote:

Casting date will tell you for sure...

'72 should be steel crank...

346 heads...



Casting dates don't tell you what MODEL year the engine would have been originally assembled as since the MODEL year build started in August of the prior year. and an engine would have been cast at least a few weeks before the actual assembling of an engine.

J is 73 , it could be either a forged crank or a cast crank. Look at the dampner . also if the engine has been rebuilt it doesn't really matter what the casting date is or what model year the engine is .