Installation Kit, LS Acc. Drive Brackets, use with STANDARD belt alignment (alignment common on Corvette, CTS-V, & G8) Installation Kit, LS Acc. Drive Brackets, use with STANDARD belt alignment (SHORT alignment common on Corvette, CTS-V, & G8) Holley accessory drive installation kits provide proper spacing for Holley A/C, P/S & Alt accessory drive brackets, so belts ride at the perfect distance on your particular engine. A Fitment And Required Components Guide helps you locate and source components and provides other notes and helpful hints to figure your distance. Three easy steps will get you going. Step one is to determine your belt alignment based on your crank pulley position on the engine you have. Step two is to choose the Holley accessory drive brackets that you need (A/C, Alt & P/S or both). Step three is to see which Holley installation kit your set-up requires to line up your accessories with your crank pulley position. An application specific installation kit (part # 21-1, 21-2, or 21-3) is REQUIRED for most applications. Accessory Drive Style High-Mount Belt Alignment Short Brand Holley Emission Code 5 Engine GM Small Block Gen III/IV (LS Based) Finish Cast Material Aluminum Product Type Accessory Bracket Thickness 0.530" Passenger Side Warranty Limited 90 Day UPC 090127682128 Part Number 21-1
