Machined from 8650 steel with a billet pushrod seat insert, these Ultra Pro Magnum XD rockers can handle up to 1,000 lbs of spring pressure. These 1820 rockers feature a 1.7 ratio for use with 7/16" stud Chevrolet 396-454 Big Block.
Built to outlast and outperform in accuracy and strength, the Ultra Pro Magnum XD rocker arms are engineered from durable 8650 steel and include a machined billet pushrod seat insert for a wide range of super accurate ratios. A unique and wide ratio range to fit almost any popular application from 1.5 to 1.8 in 0.5 in. increments for Chevy and 1.6 to 1.73 for various Ford applications is available. These Ultra Pro Magnum XD rockers are fully rebuildable and boast precision-sorted needle bearings and hardened roller tips. And, they work with most diameter springs and retainers. The XD design utilizes advanced FEA and CAD design and development to improve strength, stiffness and MOI(moment of inertia) optimization for drag and circle track applications.
  • 8650 Chromemoly Steel
  • 29 Percent Stronger Than Pro Magnum
  • Redesigned Steel Stud Mount Rocker
  • Reduced Weight And Greater Strength
  • Increased High RPM Stability
  • Black Oxide Exterior Finish
  • Increased Retainer And Valve Spring Clearances
  • Lifetime Warranty

Application Summary:

Year Make/Model
1963 Chevrolet Bel Air
1965-1975 Chevrolet Bel Air
1963 Chevrolet Biscayne
1965-1972 Chevrolet Biscayne
1972 Chevrolet Brookwood
1967-1972 Chevrolet Camaro
1966-1976 Chevrolet Caprice
1965-1973 Chevrolet Chevelle
1968 Chevrolet Chevy II
1965-1974 Chevrolet Corvette
1963 Chevrolet Impala
1965-1976 Chevrolet Impala
1970-1972 Chevrolet Kingswood
1973-1975 Chevrolet Laguna
1966-1967 Chevrolet Malibu
1973-1975 Chevrolet Malibu
1970-1975 Chevrolet Monte Carlo
1969-1970 Chevrolet Nova
1970 Chevrolet Townsman
Amazon ASIN N/A
C.A.R.B. E.O. Number N/A
C.A.R.B. Exempt for Foreign Vehicles Manufactured Before 1967? Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for On-Road Vehicles? No
C.A.R.B. Exempt for Racing and Off-Road Only Vehicles? Yes, but must be a race/competition only vehicle.
C.A.R.B. Exemption Reason N/A
California Proposition 65 Yes, Yes
Country of Origin (Primary) US
Emission Code Legal US
Engine Family Chevrolet 396-454 c.i. 8 Cylinder (1967-1996), Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
Engine Make/Size Chevy Big Block (396-454)
GTIN 00036584232490
Harmonized Tariff Code (Schedule B) 8409914000
Hazardous Material Code N
Life Cycle Status Code Available to Order
Maximum Valve Spring Open Pressure 1000, 1000
NAFTA Preference Criterion Code B
Ratio 1.7
Rocker Arm Material 8650 Chromemoly Steel, 8650 Chromemoly Steel
Rocker Arm Ratio 1.7, 1.7
Rocker Arm Series Ultra Pro Magnum XD, Ultra Pro Magnum XD
Rocker Stud Diameter 7/16, 7/16
SDR Required Flag N
SDS Sheet Number N/A
Stud Size 7/16

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Competition Cams 1820-16 Ultra Pro Magnum XD Roller Rocker Arm Set

Vehicle Fitment

Fitment: Unknown

Product Information

  • $419.95

The AAM Group™ Proposition 65
Proposition 65 warning graphic (For California Residents)
WARNING: Cancer and Reproductive Harm -

Tags: Chevelle, Camaro, Corvette, Stingray, Silverado, C10, Firebird, Chevrolet, Big Block, Chevy, BBC, 454, 427, 502, 396, Caprice, Malibu, Impala, Nova, Monte Carlo, S10, 572