Great for OEM rebuilds with stock specifications. This is a stock replacement valve spring kit and okay up to .415" valve lift and have a moderate 129 lbs seat pressure. The springs are manufactured from the highest quality clean chrome silicone wire, shot peened and heat treated for maximum fatigue life. Kit includes springs, upper collars, lower collars, and valve keys. Max valve lift: .415". Installed height: 1.375". Seat pressure 129 lbs. Open pressure: 272 lbs. @ .415" valve lift.
Fits: > 48-65 Panhead (NU)
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