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   Shop by Catalog > Drag Specialties / Fatbook > Engine > Breathers / Filters
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  S&S CRANKCASE BREATHER REED VALVE

 
 
  • New-style breather is not dependent on the rotation of the crankshaft to make it open and close; instead, reeds open when the pressure in the crankcase becomes greater than the pressure in the cam chest and close when the pressure in the cam chest is equal to or greater than the pressure in the crankcase
  • By opening and closing “on demand,” the reed valves automatically compensate for the lag time associated with accelerating the mass of air as it is forced out of the crankcase, increasing performance and stopping high-rpm oil carryover in engines with marginal piston ring seal
  • Installation is fast and simple; no aligning timing marks, and no rotating parts
  • Made in the U.S.A.
NOTE: Breather reed valve can be used in Shovelhead engines with open primary drives or sealed primary chain cases that do not require external lubrication or oil scavenging.

 
Quantity Item / Item Code Price
FOR 84-99 BIG TWIN EVOLUTION-STYLE ENGINES
Standard
0920-0008
$90.95

+.030” oversize
0920-0009
$100.95
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