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  48-E77 Big Twin (NU)

+.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.

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Home > Parts > Engine > Lower End > Breather Valves > JIMS, steel breather valve. +.030″

fits  48-E77 Big Twin (NU)

With steel breather valve spacer set for correct end play. +.030″ oversize steel breather valve. Used to save worn or damaged crankcases. Okay for stock or high performance replacement. Note: JIMS has a +.030″ breather hole reamer tool which is available as 978343. 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.

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Home > Parts > Engine > Lower End > Breather Valves > S&S, steel breather valve & spacer set. +.030″ OD

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

fits  L77-99 Big Twin (Excl. TC)

+.030″ oversize steel breather valve. Used to save worn or damaged crankcases. Okay for stock or high performance replacement. Note: JIMS has a +.030″ breather hole reamer tool which is available as 978343. Note: that steel breathers require steel breather valve spacers. Plastic breathers require plastic spacers. Do not intermix steel and plastic parts. 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. Tech tip: The timing for S&S breather valves, only for late 77-99 Big Twin models, has been changed by S&S in the year 2000. This is done to improve oil scavenging and reduce oil carry-over in high performance / large displacement engines. Old opening was at TDC and closing at 65° after BDC. New opening is 17° after TDC and closing at 82° after BDC. The old timing specification can be obtained by installing the timing mark on the breather gear one tooth clockwise from the timing mark on the cam gear. Also the breather’s cavity oil evacuation hole (opposite of the drive gear), which used to be a round hole, has been elongated (made longer) to increase the duration of suction to the crankcase breather ‘settling’ cavity. The new specifications are not useful in most stock engines, but harmless. Breather windows in S&S cases will typically open at 7° after TDC and close 92° after BDC. Builders using other crankcases may modify crankcase breather opening to obtain these specifications for maximum breather efficiency and performance.

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Home > Parts > Engine > Lower End > Breather Valves > S&S, steel breather valve. +.030″ OD