Yep, I've got a pretty good stash of 4-bolt blocks, and they're in pretty high demand. I used to scavenge up "worn out" 4-bolt blocks that had been bored .060" oversize and raced for a season or two, usually for free or scrap iron price, and then have my engine machining students use them for practice installing cylinder sleeves. With 8 sleeves in it, the block was back to standard size, and the cylinder material was better than original. It was fun, beating the other guys at the track with their own junk!
Jerry
