....Hi All, I pulled all my spark plugs, pulled the coil wire & wired the carb wide open. Although I DIDN'T warn the engine up to operating temperature. My compression readings were as follows; 185, 190, 210, 180, 190, 182, 180, & 180.... I cranked the engine over 7 times for each plug. On the one that measured 210 I re-did it & got 190 by just cranking it 5 times..... So what's up with the 210??? Why this high??? And isn't 180 to 190 high on my others??? I have a 413 small block Chev, 10 to 1 compression, AFR 195 street heads with 74 cc chambers, cam is 230/236 @ .050. w/ .512 lift {don't know if you need all this}..... Oh, even though I didn't warm the engine up to operating temperatures the directions said if you have aluminum heads to let the car cool for 10 minutes before pulling plugs. Why is this??? Thanks, Bill