Tomei Camshaft - PROCAM - Nissan Silvia (R)PS13 S14 S15 SR20DE(T) Solid, Exhaust, 270 / 12.5mm Wheel Nuts & Bolts The 130R knob is wider

The 130R knob is wider

As a countermeasure against heat cracks that could not be avoided by drilling additional holes in conventional mass-produced products

a by-product of the combustion cycle

Shorten Throw Up to 50%

and track day use

Tomei Camshaft - PROCAM - Nissan Silvia (R)PS13 S14 S15 SR20DE(T) Solid, Exhaust, 270 / 12.5mm Wheel Nuts & Bolts The 130R knob is widerWhen opening the intake valve during high acceleration the G from the camshaft requires to send as much mixture to the cylinder, Intake, the shortest time possible. However if the speed is too high it can damaged the Valves, Valve Seats and Valve Springs if the Acceleration G is too high. The Asymmetrical profile design given to the camshafts will allow the Intake and Exhaust Valves to fulfill the target requirement with the wider duration and high