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PROMAXX Performance Xtreme Valve Spring and Retainer Kits

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If you want to add some horsepower to your engine, then you'll also need a PROMAXX Performance Xtreme valve spring and retainer kit. The valve springs have been designed for cylinder heads using larger valves and aggressive camshaft profiles. PROMAXX Performance Xtreme kits also include retainers, locks, machined valve spring seats, and new valve seals.

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PROMAXX Performance Xtreme Valve Spring and Retainer Kits 8501

Valve Springs, Xtreme, Dual, Standard Style, 1.290 in. O.D., Titanium Retainers, 7 degree Locks, Kit

Part Number: PMX-8501

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Estimated Ship Date: Dec 29, 2025 if ordered today

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Estimated Ship Date: Dec 29, 2025 if ordered today

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