Quote:

the factory would start producing the a new casting ahead of the actual need . take the 400 engine , not available till 1972 but the castings started being done long before the actual model year.

I'm sorry I thought this is what I said.



I guess you did, I just expanded on it because it didn't seem to be very clear.

There was a casting change made which is the reason for the new casting number , 360 production started in late 71 , castings earlier just like this block, and it would not be surprising, to me, to find a late build 75 model year car/truck with the changed over 360 casting considering how lousy Chrysler was with inventory control.