Disconnect battery & remove all existing accessory drive brackets and components from motor. Remove water pump, scrape away any existing gasket material with a gasket scraper and dress surface with a Scotch Brite? pad. Clean and prep threads on engine block at water pump (3/8-16) and driver side bosses (7/16-14) by crank (for power steering kits). Use a 3/8-16 & 7/16-14 thread chaser if necessary. Thread chasers are available at your local auto parts store or tool dealer and are different from a thread cutting tool. Apply RTV sealer to one end of the four 3/8-16 x 3” threaded studs and thread studs into the water pump mounting holes and tighten. The studs can easily be tightened by threading two 3/8-16 zinc coated nuts onto the stud and tighten them against each other to act as a drive nut.
Install the large O-rings into both sides of the passenger side compressor bracket by seating them into the recessed groves. Place bracket over studs and seat up against engine block. Install the large O-rings into both sides of the driver side alternator bracket by seating them into the recessed groves. Place bracket over studs and seat up against engine block. For kits with power steering – apply anti-seize to the threads of the two 7/16-14 x 2-1/4” socket head cap screws and thread through the power steering bracket, alternator bracket and into engine block and finger tighten. For kits without power steering – apply anti-seize to the threads of the two 7/16-14 x 1-1/2” socket head cap screws and thread through the alternator bracket and into engine block and finger tighten
Install water pump onto studs (make sure O-rings are still seated). Apply anti-seize to exposed stud threads. Thread the four 3” spacer nuts onto the studs with the hex end out. Tighten all spacer nuts firmly at this time. Also tighten lower 7/16” cap screws on alternator bracket or power steering bracket.
STEP 1: Apply anti-seize to the threads of the two 5/16-24 x 3” socket head cap screws. Place power steering pump and pulley onto bracket and thread the two 5/16” socket head cap screws with 5/16” lock washers through pump into bracket and tighten firmly.
STEP 2: Apply anti-seize to the threads of four 8mm-1.25 x 25mm 12pt. ARP cap screws. Align bridge bracket mount holes with the four spacer nuts. Install the four 8mm 12pt. ARP cap screws and tighten firmly
Alternator: Apply anti-seize to the threads of the 10mm-1.5 x 8mm ARP 12pt. cap screw and a 8mm-1.25 x 25mm ARP 12pt. cap screw. Place alternator between lower bridge bracket and alternator bracket and thread the long ARP 12pt. cap screw through the bridge bracket, alternator and into the alternator bracket and finger tighten. 10mm shim washers are provided to shim the alternator boss to the bridge bracket. The alternator boss may vary in width due to the polishing process. Place the 8mm slide spacer with the small end towards bridge bracket on
the short ARP 12pt. cap screw, align top alternator boss with bridge bracket and thread the cap screw and slide spacer through bridge bracket and into alterna- tor boss and finger tighten.
Compressor: Apply anti-seize to the threads of the 3/8-16 compressor shoulder bolt and two 8mm-1.25 x 25mm ARP 12pt. cap screws. While supporting the compressor, place the shoulder bolt and washer into the back compressor mount boss and align with compressor bracket on motor and finger tighten. Thread one 8mm ARP 12pt. cap screw through bridge bracket and into lower compressor boss and finger tighten. Place the 8mm slide spacer with the small end towards bridge bracket on the short ARP 12pt. cap screw, align top compressor boss with bridge bracket and thread the cap screw and slide spacer through bridge bracket and into compressor boss and finger tighten.
Download Chevrolet Big Block V4120 / V4220 PDF Installation Manual
Install the large O-rings into both sides of the passenger side compressor bracket by seating them into the recessed groves. Place bracket over studs and seat up against engine block. Install the large O-rings into both sides of the driver side alternator bracket by seating them into the recessed groves. Place bracket over studs and seat up against engine block. For kits with power steering – apply anti-seize to the threads of the two 7/16-14 x 2-1/4” socket head cap screws and thread through the power steering bracket, alternator bracket and into engine block and finger tighten. For kits without power steering – apply anti-seize to the threads of the two 7/16-14 x 1-1/2” socket head cap screws and thread through the alternator bracket and into engine block and finger tighten
Install water pump onto studs (make sure O-rings are still seated). Apply anti-seize to exposed stud threads. Thread the four 3” spacer nuts onto the studs with the hex end out. Tighten all spacer nuts firmly at this time. Also tighten lower 7/16” cap screws on alternator bracket or power steering bracket.
STEP 1: Apply anti-seize to the threads of the two 5/16-24 x 3” socket head cap screws. Place power steering pump and pulley onto bracket and thread the two 5/16” socket head cap screws with 5/16” lock washers through pump into bracket and tighten firmly.
STEP 2: Apply anti-seize to the threads of four 8mm-1.25 x 25mm 12pt. ARP cap screws. Align bridge bracket mount holes with the four spacer nuts. Install the four 8mm 12pt. ARP cap screws and tighten firmly
Alternator: Apply anti-seize to the threads of the 10mm-1.5 x 8mm ARP 12pt. cap screw and a 8mm-1.25 x 25mm ARP 12pt. cap screw. Place alternator between lower bridge bracket and alternator bracket and thread the long ARP 12pt. cap screw through the bridge bracket, alternator and into the alternator bracket and finger tighten. 10mm shim washers are provided to shim the alternator boss to the bridge bracket. The alternator boss may vary in width due to the polishing process. Place the 8mm slide spacer with the small end towards bridge bracket on
the short ARP 12pt. cap screw, align top alternator boss with bridge bracket and thread the cap screw and slide spacer through bridge bracket and into alterna- tor boss and finger tighten.
Compressor: Apply anti-seize to the threads of the 3/8-16 compressor shoulder bolt and two 8mm-1.25 x 25mm ARP 12pt. cap screws. While supporting the compressor, place the shoulder bolt and washer into the back compressor mount boss and align with compressor bracket on motor and finger tighten. Thread one 8mm ARP 12pt. cap screw through bridge bracket and into lower compressor boss and finger tighten. Place the 8mm slide spacer with the small end towards bridge bracket on the short ARP 12pt. cap screw, align top compressor boss with bridge bracket and thread the cap screw and slide spacer through bridge bracket and into compressor boss and finger tighten.
Download Chevrolet Big Block V4120 / V4220 PDF Installation Manual
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