i need some advice on a compression check i just rebuilt the 350 in my 89 gta and i have no compression on the gauge i ripped the timing cover off and redid the timing chain and valve lash and still nothing i have rebuilt heads with all new valves and etc. and new head gaskets when i turn the motor over by hand i can feel that there is compression and that its most likely not the rings any advice on what it could be or any things to also check?
also when i did the check i did not open the throttle or pull all the plugs does this matter? and if i turn it over by hand will it show compression on the gauge or do i need to turn it over with the starter?

thanks in advance

 

No compression as in zero?
Check the compression tester itself. Even with the throttle closed and plugs in, still should have a fair bit (likely 120ish PSI) during cranking.

 

well i hope your compression gauge is bad ! or you got something seriously out of wack. test should be done with engine warm plugs out, throttle open and with starter, not by hand. if your gauge is good ? pull rockers off one cylinder so valves wont open and check it, if no compression you got problems.

make sure compression tester is good.....