Have you seen the Franklin cooling around the heads (pic in 1st post). They really went to town on casting fins in there and there is no need for baffles between cylinders as the pots practically touch each other. Common mod is to put 10:1 compression cylinders in there. Guess a few people are either content with their cooling or have a spare set of pots (well, sleeves, since the Franklin just has standard size pistons and removable sleeves in the pots)
Antone know what comp ratio an O-200 runs at? Franklin standard is 8.8:1