COMP Cams - 1820-1
Rocker Arm - Ultra Pro Magnum XD - 7/16 in Stud Mount - 1.70 Ratio - Full Roller - Chromoly - Big Block Chevy - Each
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. This 1820 rocker features a 1.7 ratio for use with 7/16" stud Chevrolet 396-454 Big Block.
The next design evolution of the Hi-Tech Stainless Steel Roller Rocker Arms are 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. These 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 new XD design utilizes advanced FEA and CAD design and development to improve strength, stiffness and MOI optimization for drag and circle track applications.
Engine Family: Chevrolet 396-454 c.i. 8 Cylinder (1967-1996)
Maximum Valve Spring Open Pressure: 1000
Rocker Arm Material: 8650 Chromemoly Steel
Rocker Arm Ratio: 1.7
Rocker Arm Series: Ultra Pro Magnum XD
Rocker Stud Diameter: 7/16
Amazon ASIN: B005JUX4AY
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. Exempt for Federally Certified Vehicles Manufactured Before 1967?: Yes, but must meet tailpipe emission standards for year of vehicle.
C.A.R.B. Exempt for California Certified Vehicles Manufactured Before 1965?: Yes, but must meet tailpipe emission standards for year of vehicle.
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. Exemption Reason: N/A
C.A.R.B. E.O. Number: N/A
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