Mutha Thumpr Camshaft And Cylinder Head Kit With Hp Springs And Swirl Polished Valves For Chevy Bbc Big Block 454 427 402 396 Dropping That Heavy Loping Idle And Turning Heads On The Dragstrip
✔️ 235/249 duration @.050, 0.510/0.495 lift, 107 LSA
This camshaft and cylinder head kit is designed for Chevrolet big-block engines (454, 427, 402, 396), delivering a heavy idle and strong midrange power for street and drag strip use. It combines a high-performance hydraulic cam, lifters, springs, and swirl-polished valves to maximize airflow and durability.
✅ Duration at.050: 235/249
✅ Operating range: 2,000-5,900 RPM
✅ Valve lift intake/exhaust: 0.510/0.495 in
✅ Lobe Separation: 107 degrees
✅ Spring diameter: 1.525 in; open pressure 380 lbs @ 1.200 in; closed pressure 140 lbs @ 1.900 in
✅ Max lift: 0.650 in
✅ Intake valve diameter: 2.250 in; Exhaust valve diameter: 1.880 in; Stem: 11/32 in
✅ Retainers: 10 degree chromoly; Locks: hardened steel; Rocker studs: 7/16 in; Seals & guide plates
💡 What is a camshaft and cylinder head kit with high-performance springs and swirl polished valves used for on a Chevy big-block?
This handy setup wakes up a big-block for street and drag use.
- Increases midrange and top-end power - Swirl-polished valves improve combustion efficiency - Includes lifters, springs, retainers, locks, rocker studs, seals, and guide plates - Bolt-in fit for typical big-block assemblies ✝️