MSD
Chevy Crab Cap Crank Trigger Distributor
Part # 8489
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Low-profile, crab cap, racing distributor, must be used with an MSD 6, 7 or 8-series ignition and a crank trigger.
Chevy Crab Cap Crank Trigger Distributor
Estimated Ship Date: 06/26/2026
Free Shipping - Lower 48 US States
MSRP $449.95
$359.95
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The MSD Crab Cap Distributors are built specifically for racing engines with almost no room for a distributor due to tunnel rams or blowers. The distributor is equipped with a special low-profile crab style distributor cap to allow it to fit in extremely tight areas.
The housing features two optional O-rings at the bottom that improve oil control by preventing oil pressure loss. Also, a small oil bleed hole located in the base sprays oil on the distributor and camshaft gears to prevent excessive wear. Since this is a racing distributor, there is an adjustable slip collar to make up for engines that have had the distance between the mounting surface and the gear modified.
Crowning this distributor is MSD's own Crab Cap! This cap incorporates spark plug style terminals for a better connection and grip to the plug wires.
Features:
- CNC machined billet aluminum housing and Dupont Rynite base is designed for standard Chevrolet blocks
- Must be used with an MSD Crank Trigger and MSD Ignition Control
- O-ring seals can be added to modified blocks to improve oil pressure control
- Shaft is guided by a sealed ball bearing and an extra long sintered bushing
- Oversized polished steel shaft with a QPQ coating for friction reduction
- Supplied with small, low crab style distributor cap, rotor and bronze gear
- Special oil tract improves lubrication to the distributor and cam gear
- Adjustable slip collar for engines with modified deck heights
- 0.500” taller for extra tall Chevrolet based engine blocks
- Designed to fit low in the block to clear firewall and intake combinations
| Brand | MSD |
|---|---|
| Category | Ignition |
| Color | Red |
| Distributor Cap Included | Yes |
| Distributor Type | Crank Trigger |
| Emission Code | 4 |
| Engine | Chevy Small and Big Block |
| Gear | Bronze |
| Gear Material | Bronze |
| Grade Type | Performance |
| Ignition Box Required | Yes |
| Ignition Coil Included | No |
| Ignition Rotor Included | Yes |
| part type | Distributor |
| Product Type | Distributor |
| Sub Category | Distributor and Magneto |
| Warranty | Manufacturer's Limited 1 Year Warranty |
| UPC | 085132084890 |
| Warning | California Proposition 65 |
| Part Number | 8489 |
![Chevy Bronze Distributor Gear .500"ID]()
MSD Bronze Distributor gears are machined from quality AMPCO 45 aluminum bronze containing 5% nickel.$82.43Qty:![O-Ring Kit, Billet Chevy Distributor]()
![Crab Style Distributor Cap]()
These caps are injection molded from DuPont® Rynite material and feature spark plug-style terminals.$96.25Qty:![Distributor Rotor]()
![Adjustable Collar]()
![Bottom Rotor Square Drive]()
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This part is legal for sale or use on Racing Use Only Vehicles
The following vehicles are considered Racing Use Only Vehicles:
- Racing Use Only Vehicles are vehicles that are used exclusively for competition that are not registered and that may never be used on the street.
WARNING: It is against the law to install this part on an Emissions Controlled Vehicle
Manufacturer's Limited 1 Year Warranty: See Details
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Some parts are not legal for use in California or other states with similar regulations.