HYDRAULIC - Mutha' Thumpr: High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
Product Features:- HYDRAULIC - Mutha' Thumpr: High performance street/strip, needs 9:1 compression, 2500+ stall, intake, gears and headers, rough idle.
- 287/305 Advertised Duration, 235/249 Duration @ .050", .489"/.476" Lift, 107 Lobe Separation
- Valve spring upgrade required