small block 350 running problem.

[Supersix17]

Just looking for some ideas here guys,

Have a small block 350 in a camaro.  Just rebuilt carb and have checked timing multiple times.  on a slow increase with the throttle the car seems to run fine but if i punch the accelerator quickly i get some pretty bad backfiring up through the intake and carb.    hooked a compression gauge up to #1 and let the motor run.  ONly running about 60# throughout the run.  Hooked an air line up to #1 and #7 and you could hear air leaking somewhere.  not out the carb and not out the exhaust (don't think.) 

Im thinking a bad set of rings?

any help would be greatly appreciated.  Thanks

 

[Supersix17]

pulled breather today with air line attached to #1 and was getting quite a bit or air coming out the breather.


any ideas?

 

[thewackyracer]

Try compression gauge on 1 & 7, after reading put some oil in cyl(a couple of tablespoons). Take another test, if compression raises, it's rings. If not its valves. Take these tests using starter.

 

[thewackyracer]

my guess is valves

 

[Supersix17]

pulled heads yesterday and the valves def had a lot of build-up on them and i could tell they were def not seating properly.  Wanted to change heads anyways so gonna do this now.  Switching to a set of 186s.  Gonna throw those on and see if it is any better.

Hoping its not a set of rings