MSD ProBillet Distributor 85551

Distributor, Pro-Billet, Magnetic Trigger, Mechanical Advance, Chevy, Big/Small Block, Each.

Brand: MSD Ignition

Manufacturer’s Part Number: 85551

Part Type: Distributors

Product Line: MSD Pro-Billet Distributors

Computer-Controlled Compatible: No

Trigger Style: Magnetic

Advance Type: Mechanical

Ignition Box Required: Yes

Cap Style: Male/HEI

Mechanical Tach Drive: No 

Slip Collar: No

Distributor Gear Material: Iron

Distributor Gear Rotation: Standard

Distributor Cap Color: Red

Housing Material: Billet Aluminum

Housing Finish: Natural

Marine Use: No

Quantity: Sold individually.

For all-out racing, the advance mechanism can also be easily locked out. To accurately trigger the ignition, a high-output magnetic pickup is bolted to the base. This pickup produces a precise trigger signal that will never vary more than one degree at any rpm. A durable gear is installed for performance applications, and an MSD red cap with brass terminals and race rotor is supplied. They’re available in standard and small diameter models for applications with limited clearance, and require the use of a separate ignition box such as an MSD 6, 7, 8, or 10 Series ignition.

MSD Pro-Billet distributors share the same CNC machining techniques as the rest of the MSD distributor line. They feature a housing that’s machined from high-quality 6061-T6 aluminum for durability and show-quality looks. Their oversized shaft receives a QPQ coating for friction reduction and corrosion resistance, with the added strength of two sealed ball bearings that guide the shaft accurately at well over 10,000 rpm. An extra-long sintered bushing replaces the ball bearing at the bottom of Chevrolet models. TIG-welded on top of the polished steel shaft is MSD’s accurate mechanical advance assembly. The weights are supported by nylon pads that allow the advance to operate smoothly throughout the rpm range.

Notes: Distributor is 6.9375 in. tall from engine to top of distributor cap.