Shovel bolt-in (except 1980-'81). More mid range and high-end power. Idle unaffected. (Head setup required on 1980 and 1981).
Note 1: 1980 and 1981 engines: The height of original stock H-D valve guides restricts spring travel (and valve lift) to .430 or lower!
| Compatible Vehicles | |||
| Years | Make | Make | Notes |
| 1983 | Harley-Davidson | Disc Glide FXDG | |
| 1979-1981 | Harley-Davidson | Electra Glide Classic FLHC | |
| 1983 | Harley-Davidson | Electra Glide Classic FLHTC | |
| 1977-1984 | Harley-Davidson | Electra Glide FLH | |
| 1984 | Harley-Davidson | Electra Glide FLHX | |
| 1980-1981 | Harley-Davidson | Electra Glide Sport FLHS | |
| 1984 | Harley-Davidson | Electra Glide Sport FLHS | |
| 1979-1981 | Harley-Davidson | Fat Bob FXEF | |
| 1982-1983 | Harley-Davidson | Low Glide FXRS | |
| 1977-1982 | Harley-Davidson | Low Rider FXS | |
| 1983-1984 | Harley-Davidson | Low Rider FXSB | |
| 1983 | Harley-Davidson | Sport Glide FXRT | |
| 1980-1982 | Harley-Davidson | Sturgis FXB | |
| 1977-1984 | Harley-Davidson | Super Glide Electric Start FXE | |
| 1977-1978 | Harley-Davidson | Super Glide FX | |
| 1982-1983 | Harley-Davidson | Super Glide II FXR | |
| 1981-1983 | Harley-Davidson | Tour Glide Classic FLTC | |
| 1980-1983 | Harley-Davidson | Tour Glide FLT | |
| 1980-1984 | Harley-Davidson | Wide Glide FXWG | |