Jims Breather Valve oversize .030" Big Twin L77-99 BT

+.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)