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SP Springs - High Endurance The "SP" series utilizes "Hi-Tensile" Chrome Silicon outer spring material. For applications with radical cams and/or moderately high rpm, where traditional chrome silicon springs prove inadequate, the "SP" series is the next highest level of endurance. All "SP" series springs are Spintron Test-Proven up to 8000 rpm for 700 racing miles. PLUS Springs - Endurance Plus The Endurance Plus series of valve springs utilizes a specially processed Tool Room Material outer spring for increased endurance/reliability beyond the "SP" series. Endurance Plus springs are designed for late models, modifieds, etc., and are Spintron Test-Proven up to 8400 rpm for 850 racing miles.

Model Product Image Item Name Price
9365SP SP (Special Processing) Valve Springs

SP (Special Processing) Valve Springs

Style: Dual w/Damper Outer OD/ID: 1.550/1.135 Inner OD/ID: 1.025/.740 Seat Pressure: 225 Lbs @1.950 Open Pressure: 550 Lbs @1.270 Rate Per Inch: 460...

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