Ignition

| Includes (1) blue module and (1) black connector and harness to attach to the cap | RPM Range: 6500+ |

| This HEI replacement will work in an operation to 6,500+ RPM. Samples were tested to 7,000 RPM |

| Contains one blue module and one black connector and harness to attach to cap |

| 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 |

| The cap and rotor of any ignition system must be considered mainte­nance items. Just as you change the oil and filter of your car, you should always replace the cap and rotor as a set. To make things easy, we now offer these Cap and Rotor Replacement Kits |

| Replacement rotor with brass contact | For Chevrolet, GM, and MSD HEI Style distributors |

| The cap and rotor of any ignition system must be considered mainte­nance items. Just as you change the oil and filter of your car, you should always replace the cap and rotor as a set. To make things easy, we now offer these Cap and Rotor Replacement Kits |

| This MSD Cap (MSD #84335) fits all of the MSD Distributors that use the GM Socket sytle cap (MSD #8437). It will also fit GM Distributors that use a "window" style cap | 

Cap 8433
Spark plug-style terminals with improved locking connection | Optional wire retainer with caps to lock the wires in place | HEI-Type terminals, rather than socket-type | Can be used in place of the older design |

Rotor 8467
| Standard on most MSD Pro-Billet Distributors | Injection molded from Rynite material for incredible strength and high dielectric properties | Stainless steel/brass rotor trip - screwed in place to handle extreme rpm and high heat conditions | Deep molded vanes to stir up the air inside the cap to prevent spark ionization | Screws are set deep in the housing to prevent spark scatter |

| MSD molds their most popular distributor caps in-house. This cap is injection molded from DuPont Rynite material and features spark plug-style terminals. The terminals offer improved locking connections and the Rynite material is extremely strong with excellent dielectric properties. Plus, most caps have an optional wire retainer that is supplied with these caps to lock the wires in place |

| Includes a girdle for retaining the wires to the cap. MSD has used this new design on many distributors built since the summer of 2002. Has HEI-Type terminals, rather than socket-type. Can be used in place of the older design |

| These rotors are designed with high rpm and performance in mind which is why they are standard on most MSD Pro-Billet Distributors. Both rotors are injection molded from Rynite material for incredible strength and high dielectric properties. Plus the stainless steel/brass rotor trip is also screwed in place so it can handle extreme rpm and high heat conditions |

| The rotors feature deep molded vanes to stir up the air inside the cap to prevent spark ionization. The rotor screws are set deep in the housing to prevent spark scatter |