Should I bother with this compression?

[TURB0]

Ive been in the process of reassembling my 91 gsx for some time. We pulled the head from my friends 6bolt to swap onto mine. However now that it's on, I decided to compression test it. From #1-#4 the compression reads 153-156-162-130. The compression in #4 seems oddly low, is it even worth it to keep this head on?

 

[19Eclipse90]

It is low, so while you are at your current position in progress, take it back down and figure out why the compression in that last cylinder isn't up to par. That's what I would do.

 

[95burgundyesi]

I forget where the cut off is for factory servicing or whatever is but I think your barely above it. If your in the process of reassembeling you should try to figure out whats going on. Did you try a wet test?

 

[spooled_u]

I believe the factory service manual says something like at around 126 you want to go ahead and rebuild it. The other cylinders look really nice. Do some more troubleshooting and see if you can't figure out why that cylinder is running low. It bet since its so close to the accessory belts it sees alot more heat...

 

[19Eclipse90]

Service manual also says no more than a 14 psi difference between cylinders. Do a wet test as suggested if you haven't already. If there is no change, yank it back off.