MSD 84891 Flat-Top Pro-Billet Distributor with Crab Cap Chevy V8

The MSD 84891 Flat-Top Pro-Billet Distributor is purpose-built for Chevrolet V8 engines running superchargers, blowers, tri-power setups, exotic intakes, or large air cleaner assemblies that would otherwise restrict a standard distributor. The distributor sits low in the engine block and is topped with a unique flat-style Crab Cap that routes spark plug terminals horizontally, delivering maximum underhood clearance where conventional distributors simply won't fit.

The housing is CNC-machined from lightweight 6061-T6 billet aluminum for precision and durability. A polished steel shaft receives a QPQ (corrosion-resistant) coating and is guided by a sealed ball bearing at the top of the housing, with an extra-long sintered bushing at the base for added stability throughout the rpm range.

A maintenance-free magnetic pickup provides a clean, accurate trigger signal that connects directly to an MSD 6, 7, or 8 Series ignition control. The adjustable mechanical advance assembly features a chrome moly advance plate with QPQ-coated weights and nylon pads for smooth, consistent centrifugal advance. Multiple advance springs and stop bushings are included, allowing up to 24 different timing curve configurations to precisely match your engine build.

Key Features:

• Flat Crab Cap design clears cowlings, superchargers, exotic intakes, and large air cleaners
• Distributor height of just 4.78 inches from engine block to top of cap
• CNC-machined 6061-T6 billet aluminum housing — accurate to within 0.001"
• QPQ-coated polished steel shaft guided by sealed ball bearing
• Maintenance-free magnetic pickup for accurate trigger signals across the entire rpm range
• Adjustable mechanical advance with supplied springs and stop bushings (up to 24 curve combinations)
• Chrome moly advance plate with QPQ-coated weights and nylon weight pads
• Must be used with an MSD 6, 7, or 8 Series Ignition Control
• Not legal for sale or use on pollution-controlled vehicles

What's Included:

• 1 — Pro-Billet Flat-Top Distributor
• 1 — Rotor (PN 84673)
• 1 — DuPont Rynite-molded Crab-style Distributor Cap (PN 8531)
• Advance springs and stop bushings

Notes: This distributor requires spark plug-style wire terminals. Existing spark plug wire terminals and boots may need to be replaced. MSD terminal kits PN 8849 or PN 8848 are available separately. If the gear requires replacement, use MSD Gear PN 8531 due to the 0.500" diameter shaft.