This Distributor was designed for racers and street rodders that have space limitations due to firewall interference, blowers or oversized intake manifolds such as tunnel rams. The distributor is 3/8" narrower and almost 1" shorter than a standard distributor. Proven performance features include a high output magnetic pick-up and precision machined reluctor for accurate ignition triggering. a fully adjustable mechanical advance allows you to tailor the advance curve to your specific application. Topping it all off is our own small diameter cap. This is molded out of durable Rynite® material and comes with an optional wire retainer. Features: CNC machined billet aluminum housing is 3/8" smaller in diameter and 7/8" shorter than conventional Chevy V-8 distributors with the "points" type capMaintenance-free magnetic pickup and precision reluctor create stable trigger signals throughout the rpm rangeEasy-to-adjust mechanical advance with supplied springs and stop bushingsAdjustable slip collar mounting flange for engines with modified deck heightsPolished steel shaft is QPQ coated and guided by a sealed ball bearing and extra long sintered bushingAdvance plate and weights are fine blanked from chrome moly steel and QPQ coated for friction reductionAdvance weight pins are staked and tig welded to the plateNylon pads ensure smooth operation of the advance weightsMechanical advance assembly can be locked out for crank trigger systemsSpecial oil tract improves lubrication to the distributor and cam gearO-ring seals can be added to modified blocks to improve oil pressure controlMust be used with an MSD 6, 7, 8, or 10 Series IgnitionSupplied with small diameter HEI style distributor cap and rotor (will accept 8441 Cap-A-Dapt)Will not accept a vacuum advance canisterNo CARB Exemption Order NumberPit Stop USA offers MSD Pro-Billet Small Diameter Distributor - Chevy V8 8570 at low everyday prices. Be sure to check out all of our products from MSD including MSD GM Distributors.