Fits small block or big block Chevy V8's, Housing is CNC-machined from a billet of 6061-T6 aluminum, .500” steel shaft is supported by a sealed ball bearing and a long sintered bushing, Several springs and stop bushings are supplied so you can tune an advance curve to match your application, A precision machined reflector is attached to the shaft which triggers the magnetic pick-up mounted in the housing
MSD 85551 Chevy Billet Distributor MSD
MSD 85551 Chevy Billet Distributor
Sku # 54785551
Mfr. Part # 85551
Condition
New
Brand
MSD
Sold
Each
Details
Info

You can't go wrong with the best selling MSD Billet Distributor! The housing is machined from a billet of 6061-T6 aluminum on a state-of-the-art CNC machine producing exact tolerances. For high rpm stability, a .500” steel shaft is supported by a sealed ball bearing and a long sintered bushing. This shaft also receives a QPQ coating for friction reduction and resistance to corrosion. A precision machined reluctor is attached to the shaft which triggers the magnetic pick-up mounted in the housing. This high output magnetic pick-up is the most accurate way to trigger your ignition. Plus, with no moving parts to wear or adjust, the pick-up is maintenance free! Just above the pick-up is MSD’s adjustable mechanical advance assembly. Different springs and stop bushings are supplied so you can tune an advance curve to match your application.

Fits Small Block or Big Block Chevy V8.

  • CNC machined billet aluminum housing and billet aluminum base
  • Easy-to-adjust mechanical advance with supplied springs and stop bushings
  • Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the RPM range
  • Polished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushing
  • Advance plate and weights are fine blanked from Chromoly steel and QPQ coated for friction reduction
  • Mechanical advance assembly can be locked out for crank trigger systems
  • Advance weight pins are staked and tig welded to the plate
  • Nylon pads ensure smooth operation of the advance weights
  • Special oil tract improves lubrication to the distributor and cam gear
  • O-ring seals can be added to modified blocks to improve oil pressure control
  • Supplied with an HEI style distributor cap and rotor (accepts MSD Cap-A-Dapts)
Specs
  • Cap has HEI-style terminals
  • Iron distributor gear
Charts

(PDF)

(PDF)

Installation Tips
  1. Must be used with a CD Ignition Control (MSD 6, 7, 8 or 10 Series).
  2. Will not accept a vacuum advance canister.
Specs
Sold in Quantity
Each
Advance Type
Mechanical
Cap Terminal Style
HEI / Male
Rotor Rotation
Clockwise
Distributor Cap Color
Red
Gear Material
Iron
Trigger Style
Magnetic
MFG. Part #
85551
Mechanical Tach Drive
No
Slip Collar
No
Ignition Box Required
Yes
External Ignition Box Required
Yes
Marine Use
No
GTIN Code
085132855513
Trigger Sensors
Single
Housing Finish
Natural
Gear Rotation
Standard
Housing Material
Billet Aluminum
Hall Effect
No
Sync Signal
No
Emissions
California EO Approved
Cap Type
HEI / Male
Reviews

This was a life saver for me and my Mechanic,

Rated
Product Rating
by Tatamona on June 24, 2021

Summary: It saved me from having to wait six more weeks from Summit Racing, so found it on your sight in stock. You guys are Awesome and the first purchase I made; but sure there will be many more.

Cons: I wish I had looked at Speedway First.

Pros: Was on Backorder from Summit Racing for a Month.

No, I would not recommend this product.

I would buy this again

Rated
Product Rating
by Blueeyes on March 25, 2021

Summary: Product was just what i needed to get the car back out on the track

Yes, I recommend this product.

Great distributor

Rated
Product Rating
by oneleg Joe on August 17, 2020

Summary: I have been needing this MSD setup for a while. Does not disappoint.

Yes, I recommend this product.

msd distributor

Rated
Product Rating
by corvette mike on February 10, 2020

Summary: is being used on a 58 corvette with a dual point distributor

Yes, I recommend this product.

MSD Distributor

Rated
Product Rating
by The Real Neat Deal on July 01, 2019

Summary: It's real neat 🤓

Yes, I recommend this product.

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