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sleepydsm · 09-26-2010

***UPDATE**** RESOLVED: Really used and stretched ARPs were the cause of my headgasket failures. Head would lift at 30+ psi. I was running 37psi New studs fixed this issues***

Some Background:

Blew out my composite HG earlier this summer.

Replaced with another OEM
Week later a valley formed and peed coolant on t-belt side of cly. #1

I then replaced it with a Mitsu MLS, and had the head resurfaced.

2 weeks later, I start hearing an exhaust leak noise at WOT and High Load, CEL comes on for Knock.

Fixed a loose wastegate, and an exhaust leak. Still there. Pulled head today:

Evidence of Cylinder number 2 leaking combustion gas on the firewall and radiator side.

Black coloring on cylinder head, top and bottom of HG, and block. That area the headgasket when layed in a free state is bulging and has debris inbetween the layers.

I have been reusing standard ARPs that I got 3+ years ago, and have been retorqued many times.

Any idea why this happened?

09-26-2010	#1
sleepydsm Kevin Join Date: Jan 2004 Location: Shoreview Posts: 3,356	Found My WOT Exhaust Leak: Why? *UPDATE RESOLVED: Really used and stretched ARPs were the cause of my headgasket failures. Head would lift at 30+ psi. I was running 37psi New studs fixed this issues* Some Background: Blew out my composite HG earlier this summer. Replaced with another OEM Week later a valley formed and peed coolant on t-belt side of cly. #1 I then replaced it with a Mitsu MLS, and had the head resurfaced. 2 weeks later, I start hearing an exhaust leak noise at WOT and High Load, CEL comes on for Knock. Fixed a loose wastegate, and an exhaust leak. Still there. Pulled head today: Evidence of Cylinder number 2 leaking combustion gas on the firewall and radiator side. Black coloring on cylinder head, top and bottom of HG, and block. That area the headgasket when layed in a free state is bulging and has debris inbetween the layers. I have been reusing standard ARPs that I got 3+ years ago, and have been retorqued many times. Any idea why this happened? __________________ Misses the Mitsu Community Currently on Corvette #4 Last edited by sleepydsm; 05-02-2011 at 11:25 AM..