i keep hearing about this compression calculator and i cant find it. i have a 99 civic ex and i threw a rod outuv it and i need to swap the head over to the new block that i have for it but i was thinking of having the head milled in the process. the heads a y8 and the block is a y8. its gonna get milled 20 thousandths and id like to know which head gasket to use with it to eak out a lil more compression and wut kind of ration i will be looking at when its done. also after milling the head will i have any issues with the timing belt tension? thanx for your help guys!!!