- All valves are fortified by a special process to a depth of .002" with a surface buildup of .0002"
- This process improves wear properties, reduces friction and provides resistance to corrosion and wear
- Compatible with leaded and unleaded fuels
- Made in the USA
- Kit includes 2 Black Diamond Intake valves and 2 Black Diamond Exhaust valves
- 1.825" Intake / 1.570" Exhaust.
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1957-1959 | Harley-Davidson | Sportster XL | |
| 1958-1959 | Harley-Davidson | Sportster XLCH | |
| 1960-1969 | Harley-Davidson | Sportster XLCH55 | |
| 1958-1969 | Harley-Davidson | Sportster XLH | |