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Product Summary

Chevy Small Block V8, Chevy Big Block V8, Black

  • The advance weight pins are staked and tig welded to the plate
  • A special oil tract improves lubrication to the distributor and cam gear
  • Features a CNC machined billet aluminum housing and billet aluminum base
  • It is supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts)
  • Polished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushing

Key Specs

D-40-39
MFG. Part #85555
BrandMSD
Cap TypeHEI / Male
CARB EO#

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Details

This is our most popular performance distributor! Must be used with an MSD 6, 7 or 8-series ignition. Now in Black!

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 maintenancefree! 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. Must be used with an MSD 6, 7 or 8-series ignition.

Installation Instructions

Features

  • CNC machined billet aluminum housing and billet aluminum base
  • Will not accept a vacuum advance canister
  • Must be used with an MSD Ignition Control
  • Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts)
  • O-ring seals can be added to modified blocks to improve oil pressure control
  • Special oil tract improves lubrication to the distributor and cam gear
  • Nylon pads ensure smooth operation of the advance weights
  • Advance weight pins are staked and tig welded to the plate
  • Mechanical advance assembly can be locked out for crank trigger systems
  • Advance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reduction
  • Polished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushing
  • Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm range
  • Easy-to-adjust mechanical advance with supplied springs and stop bushings
  • No CARB Exemption Order Number

Charts

Specifications

D-40-39
KEY SPECS
MFG. Part #85555
BrandMSD
Cap TypeHEI / Male
CARB EO#
GENERAL
External Ignition Box RequiredYes
Cap Terminal StyleHEI / Male
Advance TypeMechanical
Trigger StyleMagnetic
Hall EffectNo
Sync SignalNo
Trigger SensorsSingle
Gear MaterialIron
Gear RotationStandard
Distributor Cap ColorBlack
Ignition Box RequiredYes
Mechanical Tach DriveNo
Slip CollarNo
Housing MaterialBillet Aluminum
Housing FinishNatural
EmissionsCalifornia EO Approved
Marine UseNo
Sold in QuantityEach
GTIN Code085132855551