Compression gauge is correct at the oppinion of the shop that built the motor told me to put tranny fluid in the top of my cylinders over night the next day i had 150 plus compression and was set at factory 302 firing order. I ran the car drove it for about a half hour seemed to be smooth the next day it ran a little bad. I then adjusted the rockers and set the firing order to comp cams specks it back fired through the carb so i checked compression again and it was back to 60