I would blame it on a stuck lifter on the #6 hole.
If there are no performance issues prior to breaking I would think a lifter is sticking.
Just a thought.

wilbur


1950 Chevy p\u 3100. lt1 Corvette powered.
Owner\ autoglass unlimited/Ultra Clear Body Shield
Cowboys creo: taste your words before you spit them out
http://s202.photobucket.com/albums/aa180/getm24_2000/