Cylinder Heads & Components

Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own sp...

Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own sp...

Manganese bronze valve guides are popular in high-performance and racing engines because they offer superior wear resistance, high-temperature stre...

Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own sp...

Oversize Exhaust Valve Guide- Manganese. Fits Twin Cam 2005-17 & Sportster 2005-2021. +.001in. Outside Diameter

Cast Iron: After chemically separating several samples of cast iron material , analysis and evaluating the test data, we decided to have our own sp...

* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. Th...

White Diamond Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics. We fully CNC machine our Whit...

White Diamond Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics. We fully CNC machine our Whit...

White Diamond Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics. We fully CNC machine our Whit...

White Diamond Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics. We fully CNC machine our Whit...

* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. Th...

* All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth of .002, with a surface buildup of .0002. Th...

KPMI Red 100% Viton valve stem seals are designed to have optimum fitment, allow , maximum lift, and to give maximum life. KPMI® Red valve stem sea...

KPMI Red 100% Viton valve stem seals are designed to have optimum fitment, allow , maximum lift, and to give maximum life. KPMI Red valve stem seal...

KPMI Red 100% Viton valve stem seals are designed to have optimum fitment, allow , maximum lift, and to give maximum life. KPMI® Red valve stem sea...

KPMI Red 100% Viton valve stem seals are designed to have optimum fitment, allow , maximum lift, and to give maximum life. KPMI Red valve stem seal...

KPMI manufactures keepers from high tensile strength H. T. Steel. Close attention to details such as taper angle, bead location, ID, OD, radius dim...

KPMI manufactures keepers from high tensile strength H. T. Steel. Close attention to details such as taper angle, bead location, ID, OD, radius dim...

KPMI cylinder alignment dowels are machined from steel and receive a black oxide surface treatment. OEM Cylinder Alignment Dowels are often galled ...

Designed for the Harley-Davidson® Milwaukee-Eight engine, this dowel can also serve as a multi-purpose alignment pin. Our dowel incorporates OEM el...

KPMI cylinder alignment dowels are machined from steel and receive a black oxide surface treatment. OEM Cylinder Alignment Dowels are often galled ...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* Save time money when purchasing this kit * One package, everything you need for a cylinder head overhaul * Double your service life over OEM usin...

* KPMI Compression Release valves are state of the art and priced competitively * Designed to reduce "hot start" issues and starter / battery loads...

* KPMI Compression Release valves are state of the art and priced competitively * Designed to reduce "hot start" issues and starter / battery loads...

* KPMI Compression Release valves are state of the art and priced competitively * Designed to reduce "hot start" issues and starter / battery loads...

Features & Benefits:- * Fits Twin Cam & Sportster Engines. * Replaces OEM # 18094-02 * Sold as a Pack (4). Tech Tips:- * 7mm Valve Stem App...

Features & Benefits:- * Replaces OEM # 18001-83A * Sold as a Pack (4). Tech Tips:- * 5/16" Valve Stem Application.

These S&S® Super Stock® cylinder heads for 1984-'99 HD® Evolution® Big Twin engines feature a specially shaped combustion chamber and require s...

Features & Benefits:- * For S&S Compression Release Kits. * 1.500" Length * Sold Each. Proudly Made in the USA by S&S Cycle !

Features & Benefits:- * Fits Twin Cam with S&S Heads. * Fits Evo 4" & 4-1/8" Bore Engines with S&S Heads. * Must be used in conjunc...

* Highest flow level on the market. * One piece forged racing grade stainless steel alloy. * hard black nitride finish. * bearing quality hardened...

* Designed for Harley-Davidson heads * Use with OEM style valve seals * Cast Iron * High temp viton o-ring seal * Smooth lead-in * CNC machined * ...

* Designed for Harley-Davidson heads * Use with OEM style valve seals * Cast Iron * High temp viton o-ring seal * Smooth lead-in * CNC machined * ...

* Designed for Harley-Davidson heads * Use with OEM style valve seals * Cast Iron * High temp viton o-ring seal * Smooth lead-in * CNC machined * ...

* Stock length & head diameter * Extreme Duty * High Flow * one piece forged racing grade stainless steel alloy. * Liquid nitriding process cr...

Note: Maximum Recommended Lift = .650" * Beehive steel valve spring kit * Use with AV-V7MMB guide seals * Fits both Single & Triple groove valv...

Features & Benefits * Works well with cams up to .615" lift * High Performance conical single wire spring * Kit Includes: Springs, Top Collars...