I did a compression check of my chevy 350 with 461 heads & here are the results; 1-159 2-169 3-ZERO 4-165 5-164 6-164 7-165 8-161 i checked & adjusted the valve lash & rarely would puff out the carb when revved. i also noticed the same pair of rocker valves on #3 one pisses out its oil more than all the other rocker pairs. Is there some methods i can use to tell whats wrong before lifting the head? Thanks.