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Message: [QUOTE="Cr500, post: 521125, member: 9468"] I have been working on these engines since they came out, have repaired too many to count. But when it comes to head issues, 3 things are always constant regardless of anything else. Valve seat wear, guide wear, deck warpage. On a stock engine, the blow by mixed with the soot builds up and eats at the seat. Once the seat wears then the guide and or stem wears. There is a correct number clearances wise for the valve to piston. The people that simply mill a head flat and don't recess valve x amount are asking for it. The oem valve guide seals are crazy tight on these, so I was thinking for a while that was part of stem/ guide issue. I started using a different brand for seals and are set up tad loose now. On average I'd say if it has over 50k there will be some issues. If you did a leak down before tear down you would find leakage all over the intake valves. Out of 16 intakes I'm usually trashing 4 or 5 valves due to problems. [/QUOTE]

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