BBC (66-93) Late Serpentine Conversion Kit with Crank Pulley Adapter - K10474

What’s included:
Adapter plates made of 6061-T6 aircraft grade aluminum (brushed satin finish)

CNC machined crank pulley adapter

Zinc coated fasteners
-Bolts for adapter plates AND to attach GM brackets included
-Both 3/8 and 7/16 bolts are included for the passenger side head, since the holes vary for different years

What else is required to complete the installation:

GM BBC engine (1966-1993)
-366, 396, 402, 427, 454, 502, 572

AC and Alt/PS aluminum drive brackets off of a GM Truck (SBC) engine listed above.
The brackets should include the idler and tensioner.

Air conditioner compressor (from donor vehicle)

Alternator (from donor vehicle)

Power Steering Pump (from donor vehicle)

A smooth water pump pulley is required (GM part number 10085760 or 19418445)

Donor engines DO NOT have the correct pulley. (Has different bolt pattern)

Correct Water Pump Pulley: (Kwik Performance PN 19418445).

A reverse rotation water pump off of a 1988-1999 454 engine. This is considered a "long" pump and is 7 5/16" from block to fan mounting surface.

A small-block crankshaft pulley (from donor vehicle)
Donor engine didn't come with crank pulley? We've got you covered: SBC Crank Pulley: (Kwik Performance PN 10085754).

Six-rib belt, See our included installation instructions for suggested lengths and Gates part numbers. Complete Gates belt chart available under installation instructions.

Alternator rating and PS pulley diameters can change suggested lengths.

Always check tensioner marks for correct fitment.

A tall deck engine will require a belt that is about 1" longer.

A new thermostat housing may be needed to allow the upper radiator hose to clear the alternator.
Solution: a swivel-neck housing.

Upper radiator hose will probably need to change, but your vehicle's stock big-block lower hose, should work.

BBC (66-93) Late Serpentine Conversion Installation Video (YouTube)

BBC (66-93) Late Serpentine Conversion Instructions (pdf)

Big Block Spotters Guide (Adobe pdf File)

Gates Belt Chart (Part number and length)

• Which engines does this kit fit? It is designed for Big Block Chevy (BBC) engines manufactured between 1966 and 1993 with a Mark IV harmonic balancer.  It works for both standard and tall deck engines.
• What donor vehicle parts do I need? You will need the AC and Alternator/Power Steering brackets from a 1996-98 Full Size Truck (5.7L, 5.0L) or a 1996-2013 Full Size Trucks(4.3L), or 1996-2004 S10/Blazer (4.3L).
• What type of water pump is required? You must use a reverse rotation water pump from a 1988-1999 454 engine. A standard rotation pump will not work with this serpentine belt routing.
• Do I need specific pulleys? Yes. You need a smooth water pump pulley (GM Part number 10085760 or 19418445).  Your 1996+ SBC donor water pump pulley will not work.  You will also need a Small Block Chevy (SBC) crankshaft pulley from a donor engine.
• Are the bolts included? Yes, the kit includes zinc-coated fasteners for the adapter plates and for attaching the OEM brackets. It even includes both 3/8" and 7/16" bolts for the passenger side head to account for year-to-year variations.
• What belt should I use? The kit uses a standard six-rib belt. Our included installation instructions will have a suggested length and a Gates part number. Our website also has a Gates Belt Chart with other part numbers and lengths in case  your final configuration is different.
• Will the later AC compressor clear BBC tall valve covers?  Some customers have reported “yes”.  Others have used washers or spacers to raise the compressor for clearance.