got them cleaned up somewhat. what do these stamped numbers mean? piston #1 has a 2 and pistons 2,3,4 have a 3? all have corresponding numbers on the top of the block. now for my ignorant questions. i want to have the block and head resurfaced. do i need to take the pistons out of the block and the valves out of the head? i'm pretty sure the valves need to be removed for this i just hate doing it, especially without removing the cam towers. i've read your never supposed to remove the cam towers cause they are line bored from the factory, but i did on my l20b.