S&S Cycle Standard Steel Breather Gear for 1948-1977 Harley-Davidson Big Twin

S&S Cycle Standard Steel Breather Gear for 1948-1977 Harley-Davidson Big Twin

Improving crankcase breathing on a Panhead or Shovelhead-era Big Twin reduces internal pressure and keeps oil from pushing past seals. This all-steel breather gear features a welded-in screen and an elongated breather pocket scavenge hole for higher flow than the stock gear. The direct-fit design installs in place of the original without modification for immediate breathing improvement.

Key Features

• All-steel construction with welded-in screen for long-term durability
• Elongated breather pocket scavenge hole increases suction for higher flow than stock
• Higher flow than the stock breather gear reduces internal crankcase pressure
• Direct-fit replacement for 1948-1977 Harley-Davidson Big Twin engines
• Made in the USA to S&S Cycle quality standards

Technical Specifications

• Application: 1948-1977 Harley-Davidson Big Twin (Panhead and Shovelhead)
• Construction: All-steel with welded-in screen
• Flow: Higher than stock due to elongated scavenge hole
• Size: Standard
• Origin: Made in USA

Fitment Notes

• Fits 1948-1977 Harley-Davidson Big Twin (Panhead and Shovelhead) engines
• Standard size – for engines where the original breather gear hole has not been modified
• Oversize variants are available if the breather gear hole has been enlarged
• Review the Fitment tab for complete year and model compatibility