These adaptor rings limit the travel of the stock hydraulic units. = They work like solid lifters at high rpm while retaining regular hydraulic function under normal conditions. Recommended when stronger valve springs are used. Installation of these adaptors require adjustable pushrods.
- for S&S Tappets, type Big Twin 1984→ and XL 2000→
S&S Tappet for Evolution Big Twin and Sportster
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