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Herbert Cylinder heads are a domestic finished casting, that is not made in China or Asia.

Made from 355-t6 High Density Aluminum, with .530" OD Bronze Silicone Valve Guides

Herbert Cams, receives all of our heads bare and are finished and assembled in house.

All heads are assembled with the following

11/32 NK-844 Intake and XH-428 Exhaust valves

K-Motion Valve Springs

Manley Steel Retainers, Comp 10deg locks --- Titanium retainers and locks upgrade available

Manley Spring Cups

Viton Valve Seals

Manley Guideplates

Arp Rocker Arm Studs