This adapter was used by the factory 1938-1940 and is required for all early type rockerboxes on the rear exhaust position to seal properly against the valve spring and rocker arm covers.
- for Rocker housings
- fits Knucklehead 1938-1940
- steel, parkerized
- replaces OEM 177-38, and 17570-38
Paughco Rocker Arm Cover Caps
Cups and Covers for Valve Springs/Rocker Arms
Have any questions?
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