Triumph Racing Primary Crankcase Breather Stub By CBS Specs:1" X 16 TPI Stainless steel will not corrode

Stainless steel will not corrode or rust making them superior to OEM nuts

Included in this kit

Trim measures 20" in length and 7/8" wide

M Part number is 40-3230

Triumph Racing Primary Crankcase Breather Stub By CBS Specs:1" X 16 TPI Stainless steel will not corrodeA popular racing mod back in the day on pre 1970 Triumph 350, 500 and 650 unit twins was to allow the engine to breathe through the primary side case. Models from 1970 and on already featured this design however, pre 1970 models did not. If your engine features the timed inlet cam breather and you would like the engine to breathe through the primary you would have to drill (3) small holes near the bearing housing I won't get into detail regarding the