hay guys i have been working on my 1987 camaro for some time now after she sat in the yard for a few years i just rebuilt the 305. i put new bearings and rings and did a line bore and cam bearings.
i got it all back together and # 4 was not firing did a compression test and only had 35 psi in #4 was thinking maybe that the rings did not seat or maybe a valve problem. decided to check all holes b4 i pulled the head and took it down to the shop.i have only had the car running maybe 15 min since the rebuild and since the last time i got 35.psi in #4 its been ran maybe 5 min now i get 85.psi in #4 and 120psi in #6 all others #1357...2 8 all are 150psi what PSI should i be getting? this sound like rings or valves? this is driving me nuts

 

at this point I'm going to do a wet test I'm thinking i have a bad valve..
can some one tell me what psi should a 1987 305 be i have been looking for hrs and cant find what it should be i no longer have access to all data

 

The actual number isn't as important as making sure it's consistent across all cylinders.

A wet test will help you decide if it's bad rings, but a leakdown test is much more useful. Since it's between adjoining cylinders, I'd almost be tempted to say head gasket.

 

dang i hope not i just put this thing back together with new head gaskets the rings are brand new thats the ony reason I'm thinking maybe a burt valve

 

well did the wet test 89psi add 1 teaspoon oil got 103psi.. took the rockers off #4 put air into it and air is flying out the intake with a strong smell of gas

 

I have a fresh rebuild (600 miles). 150 psi across all cylinders.