While waiting transport to show up and get the yellow 67 coupe, I popped the pan off to take a little look around. The bright side, all the rods look to be standard issue L72 units, properly stamped when rebuilt along with a forged crank. The block looks to not have suffered any trauma previously. The cam looks nice as well. The pistons in this were indeed changed to forged TRW's (L2300F's). That yields a 10.2:1 compression ratio with these heads. After careful inspection of all the pistons, the engine is currently at .060. Not quite the news I was looking for, but it is what it is. On the bright side, if it does need to be bored.......070 pistons are readily available as are .100's. When AMS did the L88 for me, he told me an early 427 can safely go to .125 over.
The crank is a 6223 casting which looks to be a 396 or later 427 unit. Some internet sleuthing has allowed me the opinion it takes a little more work to get the 6223 crank balanced properly with the additional weight of the 427 pistons. That is all uneducated speculation on my part.
