the Thumpr series' early intake valve opening and long exhaust duration create optimum overlap for that race car idle. The Thumpr grinds all require an aftermarket torque converter and lower gear ratio to ensure the drivetrain always puts the engine in its powerband. Additionally
This Part Fits:
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1970-1971 | Dodge | Challenger | Base |
| 1970-1971 | Dodge | Challenger | R/T |
| 1969-1971 | Dodge | Charger | 500 |
| 1966-1971 | Dodge | Charger | Base |
| 1969 | Dodge | Charger | Daytona |
| 1967-1971 | Dodge | Charger | R/T |
| 1969 | Dodge | Charger | SE |
| 1971 | Dodge | Charger | Special Edition |
| 1971 | Dodge | Charger | Super Bee |
| 1967-1970 | Dodge | Coronet | 440 |
| 1967-1970 | Dodge | Coronet | 500 |
| 1970-1971 | Dodge | Coronet | Base |
| 1971 | Dodge | Coronet | Brougham |
| 1971 | Dodge | Coronet | Crestwood |
| 1971 | Dodge | Coronet | Custom |
| 1967-1970 | Dodge | Coronet | Deluxe |
| 1967-1970 | Dodge | Coronet | R/T |
| 1968-1970 | Dodge | Coronet | Super Bee |
| 1970-1971 | Plymouth | Cuda | Base |
| 1968-1971 | Plymouth | GTX | Base |
| 1968-1971 | Plymouth | Road Runner | Base |
