New
Normal
Lumpy idle
Strong mid / high range performance
See fitting notes
When selecting retainers and locks, customer must check if engine has single or multi groove valves
Crow Cams recommend purchasing 2x bottles of ZDDP additive with any flat tappet cam, one for the initial run in and one for the first oil change thereafter
| RPM Range | Part No. | Duration | with 1.73 Rocker | Lobe Sep Angle |
Lash
Measured Hot |
|||||
|---|---|---|---|---|---|---|---|---|---|---|
| Advertised | @.050” | |||||||||
| IN | EX | IN | EX | IN | EX | IN | EX | |||
| 2500 - 5500 | 21689-6 | 280° | 289° | 222° | 230° | 0.512 | 0.519 | 106 | HYD | HYD |
Must use performance springs.
Must use performance retainers.
Converter stall speed should be equal to or greater than the minimum RPM of the cam power range
Crow Cams recommend purchasing 2x bottles of ZDDP additive with any flat tappet cam, one for the initial run in and one for the first oil change thereafter. View our Downloads tab for a Flat Tappet run in procedure check list.