New
Normal
Choppy idle
Great mid range power
Needs serious engine mods & hi stall
See fitting notes
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 1.62 Rocker | Lobe Sep Angle | Lash | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Advertised | @.050” | |||||||||
| IN | EX | IN | EX | IN | EX | IN | EX | |||
| 3400 - 6500 | 621374 | 281° | 281° | 246° | 246° | 0.552 | 0.552 | 108 | .016" | .016" |
Must use performance springs.
Must use performance retainers.
Machining required to fit these components.
Must use performance seal.
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.