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Hoss, take time to read the history and understand the reasons for the advice. OEM's were already shifted over to roller lifters for improved efficiency when they started seeing catalytic converter...

A pro engine builder that has become a friend writes an occasional column, and according to him "....with a flat tappet cam it's not a question of IF it will fail, it's only a question of when", and...

Just to clarify, do I remember right that your primary use of the K5 is mud bogging?