Manley 10 Degree Valve Lock - 5/16 in Valve Stem - 0.050 in More Height - Black Oxide - Set of 32 RS003C0110 GM 250C / 350C /

GM 250C / 350C / 375B

Kit includes all wiring and instruc-tions to convert older model tire prep stand to the current design

Three head bolt bosses are raised higher than the standard D-port heights and will require head bolt kit #8561 to install these heads

This partially ported 305cc cylinder head features a CNC bowl & chamber blend that will provide you with flow numbers most medium sized cylinder heads (and some larger) can only dream about

Side A is 1/16" NPT

Manley 10 Degree Valve Lock - 5/16 in Valve Stem - 0.050 in More Height - Black Oxide - Set of 32 RS003C0110 GM 250C / 350C /Product Description: Valve Lock 10 Degree 5 16 in Valve Stem 0. 050 in More Height Steel Black Oxide Set of 32 Manley Performance high performance and racing engine parts have been powering winners since 1966. Since our inception in March 1966, Manley Performance Products has been at the forefront of the high performance automotive industry. Founded by gearhead Hank Manley shortly after his graduation from Brown University, our journey began with a