Well i pulled the cam out , the numbers on the end read -04 upside down1 then 4 then it has #11-16-87 ,then ssi then on the shaft it has 0288, and stamped cwc, im taking the heads to a shop tomorrow to have em checked over, the guy there today told me that running those heads 64cc with flat top pistons puts me at 11to1 compression, and i probably burned the exhaust valves running standard gas, he said i should switch to 74cc heads