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About this part

+.030" oversized breather is used to save worn or damaged crankcases. Manufactured from aerospace quality steel and CNC machined to the JIMS standard. Note: See 978343 JIMS breather hole reamer tool. Note: JIMS breathers can be used with L79-99 style steel breather valve thrust washers.

Fits: > L77-99 B.T. (excl. Twin Cam)

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Jim’s Oversize .030" Breather Valve for Big Twin L77–99 BT

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