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This post is old as hell now, but sounds like timing chain is off a tooth or two. Valve open when it is not supposed to be. Orrrr, the left head dropped a valve seat and is jamming a valve open.

5100's are only good at the lowest position with STOCK length springs or an equivalent stock length replacement. 100% agreed. It is this combo or anything else, NOT "Oh I will use the 1.5 inch higher spring perch PLUS a longer lift spring!" **** NO!! The cheap *** zinc plating on the 5100...