Originally Posted by dray8165
If it is just a valve issue - you have to question why that one valve was damaged. Usually, the valves on these trucks get damaged from overheating. Then you have to figure out what would cause just this one cylinder to overheat. Maybe a cracked injector tip or bad injector leaking too much fuel into the cylinder. If all your valves look bad, you may need to get a pyrometer installed and monitor your temps - especially if you tow or drive it like its a Corvette...
Got the head off last night, exhaust valve was cooked (It was #4 that haa no compression not #2). Exhaust valve on #2 had some nicks out of it also. This was a used engine that I put in for a friend, I told him not to put his programmer in until he got gauges, he didn't listen. He pulls trailers all over the country with it, got out west in the mountains and didn't like the power so he put a 40hp superchips progam in. He told me last night that he pulled a long uphill grade (10+ miles) and after that it did seem to run the same to him. My theory is he got exhaust temps way to hot on this pull and did the damage. Hoping this is all he hurt, I guess time will tell.