Compression numbers ?

[hugogos22]

Hey guys how do these compression numbers sound to you guys ? 170 155 160 170

[duffman1278]

Hmm 170 --> 155 seems like a big jump. Check the FSM for the limits between each compression. There's a certain tolerance thats allowed between the cylinders.

[IanS]

There is a bit of difference there, but you should be alright, were those tests done with the engine at running temp with the throttle held wide open?

[hugogos22]

They were done wide open throttle all spark plugs removed engine was cold. The reason i ask i have a gt2871r and was about to throw on cams valve springs and retainers and a greddy manifold.

[homeslicej2]

FSM says 156 is standard, but that the difference limit b/t cylinders should be no more than 14.