Cylinder Heads & Components

62 products

Shop the range of aftermarket motorcycle engine products at Pro Class Custom Parts.

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$390.99

By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high ...

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KIBBLEWHITE

$379.99

By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI® has developed ovate wire Beehive style springs that will live and perform at a high...

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KIBBLEWHITE

$375.99

Since 1939, KPMI® has taken great pride in our ability to design innovative performance improvements for valvetrains. This innovative ability has never been more apparent than with the development...

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KIBBLEWHITE

$364.99

Note: Maximum Recommended Lift = .600″ * Chromium-Silicon (CrSi) valve springs are high-tensile, durable steel alloys designed for high-performance engines * Complete Kit includes: springs, retain...

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KIBBLEWHITE

$364.99

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KIBBLEWHITE

$362.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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KIBBLEWHITE

$362.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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KIBBLEWHITE

$344.99

By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high ...

Sold Out

KIBBLEWHITE

$344.99

By taking advantage of the latest development in valve spring wire chemistry and manufacturing techniques, KPMI has developed ovate wire Beehive style springs that will live and perform at a high ...

Sold Out

KIBBLEWHITE

$310.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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KIBBLEWHITE

$310.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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KIBBLEWHITE

$300.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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KIBBLEWHITE

$310.99

Kit Includes: * A Full Set of KPMI Stainless Steel Black Diamond Valves (Stock Head Diameter) * All KPMI Black Diamond Stainless steel valves are impregnated by a special German process to a depth...

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FEULING

$912.99

Features & Benefits:- STAINLESS 12 POINT HEAD BOLTS UHL 3.215, QTY. 8 * Kit includes 8 head bolts, moly assembly lubricant and thread sealant * The strongest studs & bolts available! * Top...

AVV

$809.99

* Extreme Duty Valve Spring Kit – Titanium Retainers – .675″ Lift * Specifically designed & processed with extra shot peening & nitrided to resist failure under the most extreme conditions...