Each side of the engine block features an aluminum DOHC 8-valve cylinder head—four valves per cylinder—with roller rocker arms. The FB-series heads are constructed in two parts: the main cylinder head ...

Getting a 20 horsepower bump just by reducing valvetrain friction from the roller rockers might seem too good to be true. Spoiler alert — it is. That's because when rocker arms are replaced ...

We used a set of Trick Flow 1.6:1 roller rocker arms, which increased the cam’s advertised lift (calculated with 1.5 rockers) from 0.550 inch to 0.586 inch.