There are several broad rules of thumb that provide clues to whether increasing rocker-arm ratio will prove to be a performance boon with a given engine, cylinder head, and camshaft combination.

Aftermarket valvetrain parts are on the rise in the diesel segment. Harland Sharp is getting in on the game with its new D-Force product line, which includes roller rockers for 6.6L Duramax, Cummins ...

It may not be pleasant, but setting the valve lash on a high-performance engine is a skill that must be learned. The reality is that even the most savvy engine masters had to learn about lash at one ...

There are several broad rules of thumb that provide clues to whether increasing rocker-arm ratio will prove to be a performance boon with a given engine, cylinder head, and camshaft combination.