+.030" oversized breather is used to save worn or damaged crankcases. Manufactured from aerospace quality steel and CNC machined to the JIMS standard. Note: 48-E77 breathers must be used with 54-E77 style pinion and 70-E77 camshafts. Note: JIMS breathers can be used with L79-99 style steel breather valve thrust washers. Note: See 978343 JIMS breather hole reamer tool.

Fits: > 48-E77 B.T. (NU)