Found My WOT Exhaust Leak: Why?

[sleepydsm]

***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.
http://i1010.photobucket.com/albums/af227/KL1987/Talon/0926001552.jpg
http://i1010.photobucket.com/albums/af227/KL1987/Talon/0926001553a.jpg
http://i1010.photobucket.com/albums/af227/KL1987/Talon/0926001553.jpg
http://i1010.photobucket.com/albums/af227/KL1987/Talon/0926001554.jpg

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

Any idea why this happened?

[Kracka]

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

[sleepydsm]

So they're most likely stretched? Wouldn't that affect all cylinders versus just one?

[sleepydsm]

I'll get some MAP/A1's I guess lol

[Swifty1638]

LOL even I said swap those fuckers out one-by-one and boom..problemo solved-o.

[Swifty1638]

some stretch more then others. There was a video on this, as well as testing arp's moly lube, the shit pro racer's use, and motor oil. How when we "torque" to 100 ft. lbs...it's not actually at 100, and such. You prolly just strained them all, and those for whatever reason have stretched and become weaker then the others.

[FattyBoomBatty]

some stretch more then others.

That's what she said.

Get one of those nice expensive head gaskets too. DSM owners are lucky that you can buy a gasket that makes o-ringing the block unnecessary.

[4g63tcrazy]

MAP/A1's and a new MLS and you will be golden. About time you learn your lesson!

[blackawdtsi]

Mitsu MLS are crap. There's only one MLS worth buying.

[sleepydsm]

Mitsu MLS are crap. There's only one MLS worth buying.

Why?

Perma-Torque?