5.0 OSi Low compression in one cyclinder

[pbusanga]

engine not started for a year. have replaced oil pan (had small leak) and replaced exhaust manifolds and risers. Put Mobil 1 engine oil in

did a compression test (engine has still not been started) all cylinders are at 210 - 220 psi except one cylinder is at 90.

have been told i should run engine up and do compression test again before considering a tear down. what say you guys any tips and advice welcome.

I took valve cover of and valves seemed to be operating ok

Engine ran fine before left up and has only 180 hours on it

VP 5.0 OSi GM smb 305 MEFI4

 

[Don S]

Re: 5.0 OSi Low compression in one cyclinder

have been told i should run engine up and do compression test again before considering a tear down. what say you guys any tips and advice welcome.

I agree. After setting for a year, I wouldn't trust it to mean anything.

 

[dirtdog38]

Re: 5.0 OSi Low compression in one cyclinder

yep run it see what it does even your 220 dont seem right thats really high for a stock motor i see 150 0r 160 most of the time with a good motor hot after being run u get around 180 on a good hp motor running pump gas more than that your buying racing fuel