fits  48-E77 Big Twin (NU)

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.

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Home > Parts > Engine > Lower End > Breather Valves > JIMS, steel breather valve. STD

fits  36-47 Big Twin (NU)

OEM style replacement.

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Home > Parts > Engine > Lower End > Breather Valves > Steel breather valve. std

fits  48-E77 Big Twin (NU)

High quality steel breather valve for use as stock or high performance replacement. Note: S&S breather valves come with elongated breather holes to increase the duration of the vacuum, allowing more oil to be drawn from the cylinder heads. This has no disadvantage in any model year, either stock or Big Inch motor. Note: that steel breathers require steel breather valve spacers. Plastic breathers require plastic spacers. Do not intermix steel and plastic parts. Note: A .030″ oversize breather is available to save worn or damaged crankcases as 970601. A JIMS breather hole reamer (MCS 978343) will ream the damaged hole to +.030″ so a +.030″ breather can be used.

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Home > Parts > Engine > Lower End > Breather Valves > S&S, steel breather valve. STD