"terminal block housing" Moparts Msd Ignition 8486, One Chevy V8 Distributor Tall Block W Crab Cap Proper Wiring for Chevy's HEI Distributor Sourcing Chevy Big Block Parts: Distributors and Ignition Systems. 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. The super tall crab cap is taller to fit special racing blocks such as the Allen Root or Rocket blocks. 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. 0. 500 taller housing for extra tall Chevrolet based engine blocks Shaft is guided by a sealed ball bearing and an extra long sintered bushing Designed to fit low in the block to clear firewall and intake combinations O ring seals can be added to modified blocks to improve oil pressure control Supplied with small, low crab style distributor cap, rotor and bronze gear Must be used with an MSD Crank Trigger and MSD Ignition Control Special oil tract improves lubrication to the distributor and cam gear Oversized polished steel shaft with a QPQ coating for friction reduction CNC machined billet aluminum housing and Dupont Rynite base Adjustable slip collar for engines with modified deck heights Details: Distributor Cap Included: Yes Distributor Type: Crank Trigger Emission Code: 5 Gear: Bronze Gear Material: Bronze Ignition Box Required: Yes Ignition Coil Included: No Ignition Rotor Included: Yes Warranty: Manufacturer's Limited 1 Year Warranty