Help may have blown my new engine.
Thread Starter
Drifting
Joined: Feb 2008
Posts: 1,952
Likes: 1
From: Waveland MS
Help may have blown my new engine.
I just rebuilt my C5 Z06 (6.0 Iron Block bored .30 over 4 inch crank) 408 stoker. It went under the knife the first time because the oil rings went bad. So I broke it in for about 450 miles or so with many heat cycles never over 3k rpms and I was hitting on it (no detonation or spark rattle engine sounded great) when I missed 4th because my shifter is too far back and it doesn't fully engage 2nd 4th and 6th some time apparently 
I hit the rev limiter at 6800 or 7k like 3 times. Oil blew out of the exhaust yet the car continued to run fine, good oil pressure, good temp, etc... I had hit on the car probably 20 times before this happened with no problem at all. I am not sure exactly what it could be 
I pulled the passanger side plugs out and 3 of them had oil on the thread, 2, 6, 8 
I am thinking either a Headgasket (LS9's with ARP Studs) or Rings (Chromoly).
I did not check the coolant or the plugs on the drivers side as I hate my car right now and am tired
I will check them tomorrow and do a leakdown test on the car but until then any experience?
I hit the rev limiter at 6800 or 7k like 3 times. Oil blew out of the exhaust yet the car continued to run fine, good oil pressure, good temp, etc... I had hit on the car probably 20 times before this happened with no problem at all. I am not sure exactly what it could be I pulled the passanger side plugs out and 3 of them had oil on the thread, 2, 6, 8 I am thinking either a Headgasket (LS9's with ARP Studs) or Rings (Chromoly).
I did not check the coolant or the plugs on the drivers side as I hate my car right now and am tired
I will check them tomorrow and do a leakdown test on the car but until then any experience?
