lol that's the secret. A 400 Chrysler has a big bore (4.34 standard) and can easily go 500" and use all the usual big block heads. Why am I mentioning that? Because it is the same weight as the R3 block. I thought small blocks were also light blocks....
As for the counterbores, all I can say is these blocks were 'functional' as shipped but clearly the intention was they'd be heavily worked before anyone used them. I'm glad there are no c'bores as it allows me to do what I want in that area.
