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This S&S Cycle Valve Spring Kit part number 90-2053 is designed to provide reliable performance for Harley-Davidson Panhead and Shovelhead engines from 1948 to 1984. Crafted in the USA, this kit ensures compatibility with stock-style bottom collars, valve guides, and valves with a 3/8" stem diameter, making it an ideal choice for restoring or upgrading your vintage motorcycle engine. The kit includes late single bottom collars suitable for use in S&S cylinder heads for Shovelheads and late '81-'85 models, offering flexibility across different engine configurations.
The springs are engineered to support camshaft lifts up to 0.550", ensuring optimal valve operation without excessive stress or wear. Features include a design that allows additional rocker clearance for models from 1948 through 1965 Panheads, enabling smoother operation and reduced valve train interference. Additionally, it is compatible with thin-stem valves if thicker keepers, which maintain proper valve stem and top collar engagement, are used.
This high-quality valve spring kit is an essential upgrade for enthusiasts seeking to enhance engine performance and reliability while maintaining original specifications. Proper installation of these springs can improve valve sealing, reduce valve float at high RPMs, and extend the lifespan of your engine components, making it a valuable addition to your Harley-Davidson rebuild or upgrade project.
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