1970RSZ28

So Ive been reading up and see people with compression in the 200's. I have a stock ls1 in a 70 camaro. It has approximately 100k on it. Im having a slight "miss" feeling so i check everything including compression. My compression tests show that they are all at 110 and one is 90. Is that bad?

Thanks,
Keane

oange ss

iTrader: (50)

test numbers will vary depending on mods and mileage...put a little oil in each cylinder if the numbers increase drastically then it might be time for a ring job...make sure the throttle is wide open for the tests

Jimbo1367

They are all the same except that one. Probably the guage. Try a different guage and then try oil in the low cylinder.

Sabre002

iTrader: (7)

things to make sure you have a correct reading.

Pull all the pugs before testing any cyl.
Hold the throttle open
Also to get higher readings it should be hot.
last the lowest cyl should not be less then 15% of the highest.

100PSI is very low even for a cammed LS1. But if they all had that low it would be way down on power.