Howards Cams 121721-10 BBC Hydraulic Flat Tappet

This Howards Cams 121721-10 BBC Hydraulic Flat Tappet Camshaft fits 396-502 cubic inch Mark IV Big Block Chevy engines from 1965-1996. Howards designed this cam for street/strip use, and it features strong mid-range power and a rough idle. A 9.5:1+ compression ratio, lower rear end gears and a 2900+ stall speed torque converter are highly recommended.

Howards Cams 121721-10 BBC Hydraulic Flat Tappet Camshaft Specs:

• For Big Block Chevy 396-502 engines from 1965-1996
• Basic RPM Range: 2500 to 6600
• Valve Lift Intake: .570
• Valve Lift Exhaust: .578
• Intake Duration: 294
• Exhaust Duration: 301
• Intake Duration at .050”: 241
• Exhaust Duration at .050”: 247
• Lobe Separation: 110
• Intake Centerline: 106
• Firing Order: 1-8-4-3-6-5-7-2
• Recommended Lifter Set: 91111 Performance
• Recommended Premium Lifter Set: 91112 Max Effort
• Recommended Valve Springs: 98636
• Recommended Valve Spring, Retainer and Lock Kit: 98636-K31
• Made in the USA

Notes: Stock (O.E.) valve springs can NOT be used.

Howards Cams designed this Flat Tappet Hydraulic camshaft for high performance on the street and on the drag strip.

Howards Hydraulic Cams – From mild to wild, they are the ultimate in performance!