Less then favorable compression test results on 97 tahoe

[COCHEV]

Tune up day. decided to do cap, rotor, plugs and wires. so i thought i'd check the ol' compression while i was at it. didn't like what i found. test was dry, no oil added.

oh, specs: 104K on vortec 350

#1- 150
#3- 140
#5- 150+
#7- 95 /forums/images/graemlins/confused.gif

#2- 150
#4- 140+
#6- 145
#8- 140

don't know why #7 is so low. should i worry about it? i can feel it running a little rough and thats why i decided to to the comp. test. how long do you think before that cyl. takes a total dump. could be a valve i guess, i'd have to do a leak down.

 

[justhorsinaround]

With that drastic of a difference I'm thinkin you're prolly right on the thoughts of a valve or seal or somethin along those lines.

 

[k20]

possible its a ring on #7, when my tree fiddy was in its death throes I had a couple cyl's really low, the rings were non existant in those cylinders.

 

[COCHEV]

So do i really want to pull the heads off my wifes daily driver to see whats up? /forums/images/graemlins/thinking.gif

might as well get a lt4 hot cam to put in while i'm at it. /forums/images/graemlins/waytogo.gif

 

[84_Chevy_K10]

If you do pull the head I'd put a piston in that hole.