What is the main benefit of the 8650 chromemoly material and web-like design?

The 8650 chromemoly material and the arched, web-like design work together to increase the rocker arm's strength and rigidity. This construction also helps to reduce the moment of inertia, which optimizes the dynamic balance of your engine's valvetrain.

Will these rocker arms clear my existing valve springs and retainers?

Yes, these rocker arms feature optimized retainer and valve spring clearances. This design allows for use with most common diameter springs, retainers, and +.050" locks without clearance or fitment issues.

What is the warranty on these COMP Cams rocker arms?

COMP Cams offers a lifetime warranty on the rocker bodies against breakage. They are designed to handle up to 850 lbs of open spring pressure.

COMP Cams Rocker Arms 1.7 Ratio 1629-8

Name: COMP Cams Rocker Arms348/409 Chevy 1.7
Brand: COMP Cams
Price: 283.76 USD
Availability: InStock

COMP Cams Rocker Arms348/409 Chevy 1.7

$283.76

On Backorder

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COMP Cams rocker arms for Chevy 348-409 V8s. Features 1.7 ratio and 8650 chromemoly construction for improved strength.

Key Features

Fits a wide range of Chevrolet vehicles with 348-409 V8 engines.
Investment cast 8650 chromemoly body with an arched, web-like design for increased strength and rigidity.
Unique black oxide exterior finish helps prevent corrosion and increases durability.
Features oversized trunnions, precision-sorted needle bearings, and hardened roller tips for improved performance.
Optimized retainer and valve spring clearances allow use with most diameter springs, retainers, and +.050" locks.
1.7 ratio rocker arms designed for 3/8" studs.

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Will this fit your vehicle?

Product Details

Starting with investment cast 8650 chromemoly, these COMP Cams Ultra Pro Magnum rocker arms are built for strength and rigidity. The arched, web-like design helps reduce the moment of inertia, optimizing the dynamic balance of your engine's valvetrain. This set is specifically designed for Chevy 348 and 409 V8 engines using a 3/8" stud and a 1.7 ratio, fitting a wide range of vehicles including Chevrolet Impala, Chevelle, and C10 pickups from the mid-60s through the mid-80s.

Beyond the robust chromemoly body, these rockers feature a unique black oxide exterior finish that helps prevent corrosion and adds durability. You'll find oversized trunnions, precision-sorted needle bearings, and hardened roller tips for dependable performance. COMP Cams also optimized the retainer and valve spring clearances, meaning you can use most common spring diameters, retainers, and +.050" locks without running into clearance issues. This attention to detail means a smoother installation and better overall valvetrain stability.

These rocker arms are backed by a lifetime warranty against breakage, and are rated for use with up to 850 lbs of open spring pressure. They are a solid option for rebuilding or upgrading the valvetrain on your classic Chevy V8.