73-87chevytrucks.com
73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: Scott M on February 27, 2017, 04:50:41 pm
-
I have a ZZ4 350. not the fast burn, the one with the l98 heads.
Question is I did a compression test while changing the spark plugs and the numbers i got back where:
180 176
182 178
178 200
172 180
PF DF
Do i need to adjust the valves in order to fix the compression on that cylinder which was 200. I do not know enough about any of this so I would be taking it in to the guy who rebuilt if a few thousand miles ago. At one point in time shortly after the rebuild I did mess with the arm nut on a couple cylinders but dont remember which one(s). I was under the impression that I had a loose arm but it turn out it was timing and pinging.
I know i am probably going to get the look of this guy is dumb and going to mess something up but I am just looking for guidance.
Edit: I am calling them the arm nut cause i dont have roller rockers they are the saddle looking rockers and I apologize for not knowing the proper name
Thanks,
Scott
-
Explain how you did your compression test. Did you have a battery charger hooked up, all plugs removed, choke open, wide open throttle 3 compression strokes?
-
I feel so stupid cause I did not have all the plugs out, my choke is electric and didnt have a battery charger hooked up... I shouldnt have "ass"umed it was so easy and should have looked it up. I will retest and report back if this is proper procedure. Also I had a hard time cause my starter keep jumping off the flywheel if i tried cranking it over more than a couple of turns. is that normal? :-[
-
No that's not normal. check that it is properly mounted and shimmed. Check the teeth on the flywheel.
Unless the test is performed properly you will find very inaccurate and inconsistent readings.
-
Okay will do, i appreciate the help! Ill look into the starter as well