COMP Cams Hi-Tech 1.554 Diameter Dual Valve Springs- w/ Damper 57115BK They feature a 9 keyway

They feature a 9 keyway crank sprocket for 2

Required by many tracks and sanctioning bodies

This system also offers a full range of head motion and side and angular impact protection

Economical rubber valve stems pull through wheel for easy installation

this rollcage window net can be mounted as a right side helmet support net

COMP Cams Hi-Tech 1.554 Diameter Dual Valve Springs- w/ Damper 57115BK They feature a 9 keywayDual Valve Springs from COMP Cams are manufactured from Super Clean wire and subject to extensive quality control testing to deliver a valve spring assembly with superior strength, durability and valve train stability, no matter what the application. The dual spring design creates a stronger valve spring that can easily handle the increased lift found in extreme stress applications. COMP Cams Dual Valve Springs exceed the expectations of today's