So I have had some problems recently with my overflow tank filling up and not siphering back into the system so i decided to do a compression check and it read as followed
#1-170psi
#2-152psi
#3-164psi
#4-170psi
Car is running very strong but the over pressurizing in the coolant and that funky *** compression reading is kinda frightening me. Any tips, comments, or otherwise appreciated....I'm thinking head gasket ....or maybe I am just paranoid...Car has 60,000 miles and I did the one for one swap with arp headstuds at around 35,000 and haven't noticed much of a prob until recently. Burped the coolant real well and found 2 big air pockets and that seemed to help some but did not solve the problem...Damn and I was starting to think my tird was invincible lol...wishful thinking at best!

 

Bump...damn, twelve views and no opinions....on a side note, the coolant actually siphered back to the radiator earlier but still uncertain about #2 cylinder and the fact that this tank keeps filling up.

 

do you have heat? 9 out of 10 times it will be the head gasket. Another reason could be air trapped in the system. Does your car over heat?