Quote:
Originally Posted by Diesel911
While part do fail it actually sounds like the Camshaft Timing was slightly of allowing some contact with the Valves.
There is also a possible that the first Time one of the Valve Keepers was not in good and came loose.
Also the Valves are only allowed to protrude a certain amout from the cylinder head.
Speaking in general with a Cylinder head is re-surfaced and the Valve Seats are reground. The Valve Stems will be taller (height) in relation to the inside top Deck of the head. The Hydraulic Valve Lifters can only compensate for a certain amount of Valve Stem Height.
To correct this on other Engines you grind the end of the Valve Stem to make it shorter.
Or in some American Engines they have shorter Pushrods you can buy.
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Good point, the head should be measured to see if they took too large a cut if the head was resurfaced. I think very little is allowed as most members know.
There may have been direct involvement both times if it was over done. This is just a thought. Only measuring would verify it. It is the heads rebuilders responsibility to check a used head for deck clearance allowance.Before resurfacing. I suspect they just may have taken too much material off it themselves to true it up. Just a possibility. In no way a certainty.