Increase Airflow and Sealing with the S&S Cycle Cam Chest Breather Valve +.030 Oversize (33-4242) for 1979–1984 Harleys
Increase airflow and sealing in 1979–1984 Harley‑Davidson engines with the S&S Cycle Cam Chest Breather Valve +.030 Oversize (33-4242). Designed as a direct replacement, this valve upgrades breathing efficiency and supports smoother operation and longevity.
Oversize diameter of +.030 delivers a better seal and improved airflow, contributing to enhanced engine breathing under load and at higher RPMs.
Made in the USA, this breather valve is built for durability and reliable performance as part of a classic engine upgrade strategy.
For proper fit and sealing, this component is compatible with the S&S Breather Cam Chest Washer Set (#12-9909) and Valve Washer Set (#12-1510). Installation is recommended using the Jims Breather Ream Tool (SKU 16-0695) to ensure a clean, precise cut and maximum effectiveness.
- Oversize: +.030 for improved airflow and sealing
- Compatibility: Fits 1979–1984 Harley‑Davidson FL and FX models
- Made in the USA
- Includes compatibility with S&S Breather Cam Chest Washer Set and Valve Washer Set (#12-9909, #12-1510)
- Installation: Use Jims Breather Ream Tool (SKU 16-0695) for best results
- Direct replacement to support restoration or performance tuning
S&S cam chest breather valve +.030 oversize.
Upgrade your Harley Davidson engine with the S&S Cycle Cam Chest Breather Valve +.030 Oversize, part number 33-4242. Designed specifically for models from 1979 to 1984, this high-quality component enhances engine breathing efficiency and performance. Crafted in the USA, this breather valve is a vital upgrade for maintaining optimal engine function and longevity. Its precise oversize diameter ensures a better seal and improved airflow, which can contribute to increased horsepower and smoother operation. The breather valve is compatible with the recommended #12-9909 S&S Breather Cam Chest Washer Set and #12-1510 Cam Chest Breather Valve Washer Set, ensuring a proper fit and seal when installed correctly. Proper installation is recommended using the Jims Breather Ream Tool, SKU 16-0695, for a clean and precise fit, maximizing the effectiveness of the upgrade. This component is a direct replacement that maintains the reliability and durability expected from S&S Cycle products, making it an excellent choice for both restoring vintage engines and tuning performance in custom builds.
Features:
- Oversize: +.030 for improved airflow and sealing
- Material: High-quality components built for durability
- Compatibility: Fits 1979-1984 Harley Davidson FL and FX models
- Made in the USA: Ensures premium quality and craftsmanship
- Includes: Compatible with S&S Breather Cam Chest Washer Set and Valve Washer Set
- Installation Notes: Use with Jims Breather Ream Tool for optimal fit
Fitment:
Harley Davidson FL 1979
Harley Davidson FL 1980
Harley Davidson FL 1981
Harley Davidson FL 1982
Harley Davidson FL 1983
Harley Davidson FL 1984
Harley Davidson FLST 1986
Harley Davidson FLST 1987
Harley Davidson FLST 1988
Harley Davidson FLST 1989
Harley Davidson FLST 1990
Harley Davidson FLST 1991
Harley Davidson FLST 1992
Harley Davidson FLST 1993
Harley Davidson FLST 1994
Harley Davidson FLST 1995
Harley Davidson FLST 1996
Harley Davidson FLST 1997
Harley Davidson FLST 1998
Harley Davidson FLT 1979
Harley Davidson FLT 1980
Harley Davidson FLT 1981
Harley Davidson FLT 1982
Harley Davidson FLT 1983
Harley Davidson FLT 1984
Harley Davidson FLT 1985
Harley Davidson FLT 1986
Harley Davidson FLT 1987
Harley Davidson FLT 1988
Harley Davidson FLT 1989
Harley Davidson FLT 1990
Harley Davidson FLT 1991
Harley Davidson FLT 1992
Harley Davidson FLT 1993
Harley Davidson FLT 1994
Harley Davidson FLT 1995
Harley Davidson FLT 1996
Harley Davidson FLT 1997
Harley Davidson FLT 1998
Harley Davidson FX 1979
Harley Davidson FX 1980
Harley Davidson FX 1981
Harley Davidson FX 1982
Harley Davidson FX 1983
Harley Davidson FX 1984
Harley Davidson FXD 1991
Harley Davidson FXD 1992
Harley Davidson FXD 1993
Harley Davidson FXD 1994
Harley Davidson FXD 1995
Harley Davidson FXD 1996
Harley Davidson FXD 1997
Harley Davidson FXD 1998
Harley Davidson FXR 1982
Harley Davidson FXR 1983
Harley Davidson FXR 1984
Harley Davidson FXR 1985
Harley Davidson FXR 1986
Harley Davidson FXR 1987
Harley Davidson FXR 1988
Harley Davidson FXR 1989
Harley Davidson FXR 1990
Harley Davidson FXR 1991
Harley Davidson FXR 1992
Harley Davidson FXR 1993
Harley Davidson FXR 1994
Harley Davidson FXST 1984
Harley Davidson FXST 1985
Harley Davidson FXST 1986
Harley Davidson FXST 1987
Harley Davidson FXST 1988
Harley Davidson FXST 1989
Harley Davidson FXST 1990
Harley Davidson FXST 1991
Harley Davidson FXST 1992
Harley Davidson FXST 1993
Harley Davidson FXST 1994
Harley Davidson FXST 1995
Harley Davidson FXST 1996
Harley Davidson FXST 1997
Harley Davidson FXST 1998
