I just did a compression test on my freshly installed OBD1 B18B1, results are 180psi on cylinders 1, 2 and 3 but 160psi on cyl 4. I put some oil in the cylinder and it went to 220psi. Is it time for a rebuild? or will it take some boosting abuse (ill later add forged but I want to be able to boost for a while)?

thanks for your help

 

bump

 

i think you've exceeded maximum deviation on it. i think it's <u>+</u> 20 psi all the way across, whether it's 20 up or 10 up and 10 down.