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Summit Racing Part Number:SUM-850001-T Computer-Controlled Compatible: No Trigger Style: Magnetic Advance Type: Vacuum and mechanical Cap Style: Male/HEI Mechanical Tach Drive: Corvette Slip Collar: No Gear Material: Steel Ignition Box Required: No Distributor Gear Rotation: Standard Distributor Cap Color: Black Housing Material: Cast aluminum Housing Finish: Machined Marine Use: No Quantity: Sold individually. Notes: Includes brass terminals on the cap. Main shaft diameter of 0.490 inches. Will not fit computer controlled applications. Fits corvette tach drive only (0.104 in. square drive). Distributor drive gear is compatible with flat tappet or hydraulic roller cams. In-Store Pickup:Choose In-store pick-up (OH, GA, NV) on our web site. Get more power with an HEI than you ever expected with a brand new Summit® blueprinted HEI distributor. They feature a 50,000 V coil, medium weight advance springs, and an aluminum housing. Most come with an adjustable vacuum advance and the distributor shafts are guided by precisely aligned bushings for durability in extended street use. Separate advance springs can be purchased so you can fine-tune to your hearts content.