[olddog]

If you were to purchase an aftermarket cast iron block in the 4.125" bore, you would have 364 cid. Obviously you would have a much stronger block with better oiling design, and that is worth something. The 17 cubes aught to be worth at least 20 Hp (figure un-shrouding the valves should help too).

So is the 20+ Hp and better block worth the $2500-3000 for the block?