BBC Late Serpentine Conversion Kit - K10270

What’s included:

Adapter plates made of 6061-T6 aircraft grade aluminum (brushed satin finish)

Zinc coated fasteners

Bolts for adapter plates AND to attach OEM 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) -or- (1994-2000) 366, 396, 402, 427, 454, 502, 572

AC and Alt/PS aluminum drive brackets off of a GM Truck engine listed above in description.

• 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).

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.

Consider the Gates replacement Water Pump: (Kwik Performance PN 44030).

A big-block crankshaft pulley, GM part number 10085753 (usually retails for $150+)

• Solution: We have developed an adapter to let you bolt on the SBC crank pulley from the donor engine.
• Consider the Crank Pulley Adapter for BBC engines (1966-93): (Kwik Performance PN K10259).
• Consider the Crank Pulley Adapter for BBC engines (1994-2000): (Kwik Performance PN K10540).

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.

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)

Q: What’s the primary purpose of the K10270 conversion kit?

A: This kit consists of a set of adapter plates that allow you to bolt on a factory Small Block Chevy serpentine system to a Big Block Chevy engine. Using these widely available OEM brackets allows for a reliable serpentine setup without the high cost of aftermarket billet systems. This kit assumes  you already have a BBC serpentine crank pulley. If not, we offer crank pulley adapter kits that will let you re-use your SBC crank pulley. See K10259 for Mark IV balancers (1966-93) or K10540 for Gen 5 and Gen 6 balancers (1994-2000).

Q: Which engines does this kit fit?

A: It is designed for Big Block Chevy (BBC) engines manufactured between 1966 and 2000.  It works for both standard and tall deck engines.

Q: What donor vehicle parts do I need?

A: 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).

Q: What type of water pump is required?

A: You must use a reverse rotation water pump from a 1988-2000 454 engine. A standard rotation pump will not work.

Q: Do I need specific pulleys?

A: 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 454 serpentine crank pulley or a SBC crank pulley from one of the donor engines mentioned above plus the appropriate pulley adapter.

Q: Are the bolts included?

A: 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.

Q: What belt should I use?

A: 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.

Q: Will the later AC compressor clear BBC tall valve covers?

A: Some customers have reported “yes”. Others have used washers or spacers to raise the compressor for clearance.