i am running flat tops ... i ordered the pistons before i got the heads. and i ordered about 10.5 to 1 pistons for 64cc chambers. so i figure im at about 9 to 1 now??! is this correct? or close...? i've got 33 by 10 and halfs on there... its a truck ... i can hear a ticking sound.. i was thinking it was just exhaust leakage. but i have undone the y pipe and tightened the crap out of those bolts.. multiple times! still got a ticking?? the cam does have quite a bit lift.. .528 on exhaust and .509 on intake i believe.. i didnt upgrade springs and i haven't done anything special with the lifters. could it be something in that area??