[MAStuart]

Thanks guys for the replies. I went to do some more checking. Measured the bore right on 4.000. My new boss block is undersized and needs to be honed to 4.000. Got the two mixed up. I am not sure what I am going to do with it. Need to put a 331 together and not sure what block I will use. That's why I was asking what this block was. Brent are you still interested if it has to go oversize. It is standard right now and I don't know how much honing it will take to clean up. For my use I need to go .030 over so no big deal.


A little more info on the block. Larry yes the two holes in the lifter valley is tapped. On the deck surface the head bolt holes by the intake valley are blind holes and the holes at the outside of the block go into water. I think this is kind of strange.

Bernica I had some older catalogs too and could not match it up to anything.

Did a google search and came up with a few hit with pictures. It is a B50 and it seams that it was still available when the new boss block came out in 2007.

I wire brushed a few more numbers to read. The number by the starter is the same as on the main cap. I think there is a casting date that maybe someone can decode. The SVO on the main caps is what was throwing me for a loop because I was thinking mid 80's.