Engines and Components› Camshafts and Valvetrain

COMP Cams

Nut 1621/1622 Chrysler 273-360, 383-440

$12.95

SKU: C007 1321N-1

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
Non-Returnable Item
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Easy — 1–2 hours

Overview

The COMP Cams Pro Magnum Shaft Rocker Arms replacement nut is a critical component for your valvetrain. Made from SAE 8620 chromemoly steel, this nut is heat-treated for maximum strength and stiffness. Its unique oil system ensures all critical parts are lubricated for long-lasting service.

This replacement nut is designed for the Big Block Chrysler system (part #1321-16), which includes a special adjuster that allows the use of conventional ball-ended pushrods. It is compatible with Ultra Pro Magnum rocker arm series and features a shaft-style rocker stud diameter.
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Part #: 1321N-1

Made from SAE 8620 chromemoly Steel - Rocker bodies are heat-treated to obtain maximum strength and stiffness - Unique oil system lubricates all critical parts for long lasting service. - Big Block Chrysler system (part #1321-16) includes a special adjuster which allows the use of conventional ball ended pushrods.

This adjuster nut replaces the nut that comes with our 1621 and 1622 shaft-mount rocker systems for Chrysler 273-360 and 383-440.

This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandCOMP Cams
Part NumberC007 1321N-1

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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