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| Originally designed with NASCAR in mind, the 6ALN CDI ingnition control box is equipped with the mandatory 6-Pin Weathertight connector to meet NASCARs ignition wiring rule, 20-6.1. Plus, a special clear base plate is also installed for easy tech inspection | The 6ALN has a built-in Rev Control | These rev controls are adjustable with plug-in modules and will save your engine from over-rev damage caused by missed shifts or driveline failure | Multiple spark, capacitive discharge ignition control | Designed for circle track racing with NASCAR mandated connectors and clear epoxy potting compound for vibration protection | Circuit board is encased in a clear two part silicone elastomer | Clear plastic base plate for easy tech inspection |

| Built-in Soft Touch Rev Control is adjustable with RPM Modules | Multiple sparks for 20 degrees of crankshaft rotation | Works on 12 - 18 volt electrical system | Accepts breaker points, amplifier and magnetic pickup trigger inputs | 470 primary voltage output to coil | Programmable for 4, 6, or 8-cylinders by cutting red/blue wire loops |

| Supplied with rubber shock mounts | Supplied with 3,000, 6,000, 7,000 & 8,000 RPM Modules |

| HEI | Mechanical Advance | Magnetic Trigger | Steel Gear | Ignition Box Required | No Mechanical Tach Drive | Slip Collar | Billet Aluminum Housing, Natural Finish | MFG. Part #85561 |

If you have a slightly taller block or have decked the heads, the distance between the distributor mounting pad and the cam gear/oil pump drive may be different. MSD offers these Distributor with an adjustable slip collar with 1.5” of adjustment so you can be sure the distributor is installed correctly. The distributor shares the same features of the standard Pro-Billet Chevrolet model including a ball bearing guide, long sintered lower bushing, oil seal, and an adjustable mechanical advance assembly. The maintenance-free magnetic pick-up in the billet base of the distributor triggers the MSD CD Ignition box (not included). 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)

Must be used with a CD Ignition Control (MSD 6, 7, 8 or 10 Series).
Will not accept a vacuum advance canister.
Designed for racing blocks with maximum increased deck height such as Alan Root, Merlin and Rocket Blocks.

| Cap has HEI-style terminals | Slip collar has 1.5" of adjustment | Iron distributor gear |

| HEI | No Advance | Magnetic Trigger | Bronze Gear | Red Distributor Cap | Ignition Box is Required | No Mechanical Tach Drive | Slip Collar | Billet Aluminum Housing Material | Natural Finish | MFG. Part #85501 |

This strong, billet aluminum distributor is set up for engines that run locked-out timing or an MSD Timing Computer. With no advance assembly, the rotor plate is welded directly to the oversized shaft. A sealed ball bearing guides the top of the shaft while an extra long sintered bushing stabilizes the lower portion. Trigger signals are produced via a high-output magnetic pick-up. This pickup is extremely accurate and never requires adjustment. Since this distributor is designed primarily for race engines, an oversized (.006”) bronze gear is installed along with an adjustable slip collar for modified blocks, heads or intake manifolds.

|Designed primarily for race applications with no mechanical advance | Ideal for the 604 Crate Engine application | CNC machined billet aluminum housing and billet aluminum base | Maintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm range Adjustable slip collar mounting flange for engines with modified deck heights | Polished steel shaft is QPQ coated and guided by a sealed ball bearing | 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 a 0.006” oversized bronze gear installed | Supplied with an HEI style distributor cap and rotor (accepts Cap-A-Dapts) | Must be used with an MSD 6, 7, 8, or 10 Series Ignition | Will not accept a vacuum advance canister | Must be used with an MSD 6, 7, 8 or 10 Series Ignition | Locked-out Timing from the factory |

Adjustable slip collar allows you to adjust the distributors height. This is great for engines with modified intakes and deck heights

| You can easily change the RPM limit on your MSD ignition box by switching RPM modules | Various RPM's available between 6200-8500 |

| HEI Style Cap | Mechanical and Vacuum Advance | Magnetic Trigger | Steel Gear | No Ignition Box Required | No Mechanical Tach Drive | Billet Aluminum Housing | Natura Finish | Distributor is designed to replace GM HEI distributors that use a 4-pin ignition module |

The Chevrolet HEI Distributor is a favorite for muscle cars, street rods and even circle track racers. The integrated coil keeps underhood wiring clean, and for race cars, the idea of running one wire to the distributor keeps things simple. However, when it comes to performance, the stock HEI falls short. The MSD Pro-Billet HEI picks up where a stock HEI falls short with a digital module and high output coil, so there is plenty of spark energy combined with improved dwell and timing control. Ready to install in your engine!

| Easy-to-adjust mechanical advance with supplied springs and stop bushings | Vacuum advance canister for improved economy (can be locked out) | CNC machined billet aluminum housing and billet aluminum base | Polished steel shaft is QPQ coated and guided by a sealed ball bearing | Advance plate and weights are fine blanked from chromoly steel and QPQ coated for friction reduction | Mechanical advance assembly can easily be locked out | 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 | Supplied with a 7.5 amp, single spark, inductive discharge ignition module | Epoxy filled 42,000 Volt coil with .31 OHMs resistance | Full spark energy output to 9,000 RPM | Supplied with brass terminal distributor cap and rotor | Iron distributor gear | Includes three sets of springs and four stop bushings | Dial in up to 24 different timing curves to match your driving needs |

| Designed to replace GM HEI distributors that use a 4-Pin ignition module |

| HEI Style Cap | Mechanical and Vacuum Advance | Magnetic Trigger | Steel Gear | Black Distributor Cap | No Ignition Box Required | No Mechanical Tach Drive | No Slip Collar | Billet Aluminum Housing | Black Anodized Finish | Not for Marine Use |

| Designed to replace GM HEI distributors that use a 4-pin ignition module | All the performance and benefits of a GM HEI in a sleek black package | Replaces GM HEI distributors that use a 4-pin ignition module | The Chevrolet HEI Distributor is a favorite for muscle cars, street rods and even circle track racers | The integrated coil keeps underhood wiring clean, and for race cars, the idea of running one wire to the distributor keeps things simple. However, when it comes to performance, the stock HEI falls short. MSD answers the need for a strong, accurate and high performance HEI with our Pro-Billet HEI. The distributor is supplied with our Digital HEI Module and Coil so there is plenty of spark energy combined with improved dwell and timing control. Tig welded on top of the distributor shaft is MSD’s adjustable centrifugal advance assembly. The supplied advance curve kit comes with springs and stop bushings letting you dial in different timing curves to match your driving needs. Plus, there’s a vacuum advance for those concerned with economy. All of this is assembled around a precision and great looking CNC machined housing that is black anodized for great looks. The distributor is supplied with our cap, rotor, coil cover and heavy duty gear so it is ready to install in your engine |

| The PN 83653 is designed to replace GM HEI Distributors that use a 4-pin ignition module |

| A complete performance HEI distributor upgrade for Chevy V8 engines | Supplied with stainless steel distributor cap for long life and superior performance | Full spark energy output to 9,000 RPM | Supplied with an 8.5 amp, single spark, inductive discharge ignition module, MSD PN 83647, and MSD HEI Coil, PN 8225 | 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 easily be locked out for racing or EFI applications | 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 | CNC machined billet aluminum housing and billet aluminum base anodized black for a clean look | Vacuum advance canister for improved economy (can be locked out) | Easy-to-adjust mechanical advance with supplied springs and stop bushings |

| This all new Heat HEI Module supersedes the current PN 83645 | Using upgraded components, the HEAT produces high output for stock and MSD applications plus has a built-in rev limiter that is more accurate and easier to set with the engine running | Works with non-computer controlled (4-Pin) HEI housings | Easily installs to non-computer controlled (4-Pin) HEI housings | Built-in adjustable rev limiter can easily be set externally | Advanced dwell control for improved high rpm output |

| The Hottest HEI Module you buy-period! | Produces an incredible 7.5 amps of juice! | Adjust the rev limiter without removing the cap! | Fits in stock HEI distributors |

| The MSD Coil Bracket offers easy, univer­sal mounting for standard size ignition coils up to 2-1/4" in diameter. The Bracket uses a bolt and nut combination instead of the easily stripped self-tapping screw common on other brand brackets.  Perfect for cannister type coils |

| Adjustable from 1-3/4" to 2-3/8" with slight bending of mounting tabs |

| 90 deg terminals and boots are installed on both sides to connect to an HEI style terminal | A Power Tower is also supplied to adapt to a socket style cap | 18" long |