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Ignitions and Electrical› Distributors, Magnetos and Crank Triggers

HEI

Pro-Billet Distributor Chevy V8

$449.95 $358.95 Save $91.00

SKU: 85551

Special Order
Special Order
Ships in 4–6 weeks
Free Shipping over $200
$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The MSD 85551 is a Pro-Billet distributor designed for Chevy V8 engines. It features a CNC-machined billet aluminum housing and base, with a steel shaft that is QPQ coated for durability. This distributor uses a maintenance-free magnetic pickup for stable trigger signals and has an adjustable mechanical advance assembly that can be locked out for crank trigger systems.
Show original supplier description
The MSD 85551 Pro-Billet Distributor is engineered for high-RPM race track performance in Chevy V8 engines. Its housing is CNC-machined from 6061-T6 billet aluminum, ensuring precise tolerances, while the billet aluminum base adds to its robust construction. The polished steel shaft is QPQ coated for enhanced friction reduction and corrosion resistance, and it is supported by a sealed ball bearing and an extra-long sintered bushing for high-RPM stability. This distributor utilizes a maintenance-free magnetic pickup and a precision reluctor, which work together to create stable trigger signals across the entire RPM range. It features an adjustable mechanical advance assembly that comes with supplied springs and stop bushings, allowing for fine-tuning of the advance curve to match specific applications. The advance weights and plate are fine blanked from chrome moly steel and QPQ coated for reduced friction. Crucially, this distributor will not accept a vacuum advance canister. It is designed to be used exclusively with an MSD 6, 7, or 8-series ignition control. The unit is supplied with an HEI-style distributor cap and rotor, which accepts Cap-A-Dapts. O-ring seals can be added to modified blocks to improve oil pressure control, and a special oil tract enhances lubrication to the distributor and cam gear.

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

BrandHEI
Part Number85551
CategoryIgnitions and Electrical
5,000+ Trusted brands
1M+ Enthusiasts
5M+ Parts sold
(760) 282-4645 hello@motormia.co

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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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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