Quote:
Originally Posted by blykins
That's a new one for me. Never seen anything like that.
I've heard of guys having a microscopically incorrect surface finish on the valve stems that acted like a file over time, but I've never seen that before.
I also know that GM had a batch of bronze valve guides that were incorrectly hardened on the Z06 Vette several years back. It accelerated the wear.
I'd change the guides and valves both. It will need a valve job as I imagine the valve head has been dancing around on the seat.
|
Trust me Brent, GM NEVER used bronze/brass valve guides in their LS/LT/Lx OEM (factory installed) engines the guides were ALL were powdered metal. The C6 valvetrain problems were (for the most part) caused By Linimar (Canada based contractor) who had the GM contract to CNC the ZR1/Z06 head valve jobs. They bore the powdered metal guides out of center, causing massive valve to seat mis-matches. This usually resulted in the exhaust sodium filled exhaust valve head to break off trashing the engine.