Intake Valve Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A.

Valve Spring Kit Designed to out-perform and outlast the factory valve springs, Kit features lightweight, high-strength CrSi valve springs, H.T. steel base washers and titanium spring retainers, Complete kit, everything you need to for a complete valve...

Valve Guide All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Keepers are not included, Made in the U.S.A.

Intake Valve Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A., Must use...

Exhaust Valve Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A., Must use...

Valve Spring Kit Designed to out-perform and outlast the factory valve springs, Kit features lightweight, high-strength CrSi valve springs, H.T. steel base washers and titanium spring retainers, Complete kit, everything you need to for a complete valve...

Exhaust Valve Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S.A., Must use...

Valve Guide All valve guides are made of Ampco-45, a high-performance compound with 80% copper content to provide great heat conductivity and 5% nickel content for wear resistance, Keepers are not included, Made in the U.S.A.

Valve Spring Kit Black Diamond* valves feature one-piece stainless steel construction with stellite tips and special impregnation to improve wear properties and reduce friction; White Diamond? valves feature one-piece construction and hard chrome stems,...

Piston System The only safe way to maximize compression; the valve reliefs in the piston are purposely convex and match the geometry of the dishes in the valves, Conversion to Black Diamond* stainless steel valves offers up to twice the life of the stock...

Valve Spring Kit Black Diamond* valves feature one-piece stainless steel construction with stellite tips and special impregnation to improve wear properties and reduce friction; White Diamond? valves feature one-piece construction and hard chrome stems,...

Valve Guide Precision-machined from C630, Compatible with no-lead fuel and accept any type of valve-stem material, Provide maximum service with chromed valve stems, Feature a tapered nose design for maximum bearing service and minimal port obstruction;...

Valve Guide - Big Twin Precision-machined from nickel bronze, Nickel content of 5% produces superior resistance to wear, and the approximately 80% copper content delivers outstanding heat conductivity, Compatible with no-lead fuel and accept any type of...

Valve Guide Precision-machined guides, Manganese bronze guide material is softer than nickel aluminum bronze valve guides, Excellent heat conductivity which promotes long valve life, Guides can be easily reamed with a battery-operated or electric drill...

Intake Valve - Polaris 500 - 38mm Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the...

Exhaust Valve - CRF250R - 27mm Black Diamond* valves are CNC machined from one-piece forgings of EV8 Stainless Steel, Black Diamond* proprietary multi-stage process reduces friction, and provides superior resistance to corrosion and wear, Made in the U.S...

Cast Iron Valve Seat - Exhaust - Evolution Tests have proven that the machinability, wear and thermal conductivity surpasses all standards, Compatible with all fuel blends, Made in the U.S.A.

Valve Seals - Viton - Evolution For use with intake and exhaust valve guides, Retain their ability to seal in adverse conditions, PTFE seals feature a metal jacket with choker spring, Made in the U.S.A.

Valve Seal - 4.5 mm - Viton All valve seals are made of 100% solid Viton? for long life, Meet or exceed OEM specifications, When using Kibblewhite spring kits, Kibblewhite valve seals must be used because of spring clearances, Made in the U.S.A.

Valve Seal - 5.00 mm - Viton All valve seals are made of 100% solid Viton? for long life, Meet or exceed OEM specifications, When using Kibblewhite spring kits, Kibblewhite valve seals must be used because of spring clearances, Made in the U.S.A.