i know there is such an animal as thinner base and head gaskets for my 750 but how about thicker ones for say, someone wanting to drop compression. i got offered a killer deal on some brand new 836 pistons but they're 12.5:1 compression. the chambers will have been worked, un-shrouding the valves so that will drop it a bit as well. i can get these pistons for 100 dollars. he asked that i dont buy them just to sell them, said if i did he might as well do the same and sell them for full price so i have got to respect his wishes.