Sorry, I messed that up. 354’s came out in ‘56. The “555” heads that everyone wants are ‘55 331 heads. But there are a couple castings for the 354’s that are about the same as the 555’s, just different casting numbers. The 392 heads are the ones that aren’t liked, because they added material and a less than great turn at the port because of the added deck height on the 392.
