Holley - Main Jet Extension 485 in - Duration 250

485 in - Duration 250 / 258 - 111 LSA - 800 / 5000 RPM - AMC Inline-6 - Each

Differential Shim - Pinion Retainer / Pre-Load Shims - Bolts / Crush Sleeve / Pinion Nut / Shims - Dana 60 / 61 - Kit

570 in - Duration 279 / 286 - 112

Water Pump - Mechanical - Victor Series - 5/8 in Pilot - Short Design - Aluminum - Natural - Small Block Chevy - Each

Holley - Main Jet Extension 485 in - Duration 250An improved jet extension design that actually screws into the metering block. The main metering jet then threads into the end of the extension. The installation effectively moves the fuel entry point for the main jet out into the fuel bowl. In this location it cannot be uncovered by fuel, causing a lean condition, during periods of hard acceleration or braking. 2 Pkg.