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.