Chevy Big Block Single-Groove Aluminum Short Water Pump Pulley - Natural

• Fits Chevy big block (396-454) short water pump accessory drive applications

• V-belt, 1-groove aluminum design, 6.600" OD for single-belt front drives

• 4-bolt hub matches 5/8" water pump shaft for direct bolt-up installation

• Natural-finished aluminum reduces rotating weight vs. stock steel pulleys

This water pump pulley is machined from aluminum with a natural finish, built for Chevy big block accessory drive systems — 396, 402, 427, and 454 cubic-inch Gen II (Mark IV) engines — running a short water pump. It's a 1-groove pulley with a 6.600" outside diameter, sized to bolt directly to a 5/8" water pump shaft using a 4-bolt hole pattern.

Pulley diameter directly affects water pump speed, which influences coolant flow and cooling performance, so matching this pulley's dimensions to your accessory drive is part of getting correct belt alignment and cooling behavior, not just a bolt-up fit. Before ordering, confirm your engine uses a short water pump rather than long, and check that groove count, belt style, and pulley offset match your current accessory drive components.

The aluminum body's natural finish keeps rotating weight lower than a comparable stock steel pulley while giving the front drive a clean, unfinished-metal look. As with any water pump pulley swap, verify mounting hardware, shaft fit, and belt alignment before installation.

Applications
Built for Chevy big block short water pump accessory drive systems (396-454 Gen II/Mark IV), including Chevelle, Camaro, Corvette, C10/C20 truck platforms, Impala, El Camino, and Monte Carlo applications.

Installation
Confirm short vs. long water pump configuration, and that your water pump shaft is 5/8" with a 4-bolt mounting pattern — this pulley is built to that spec. Match belt width, groove count, and pulley offset to your existing components, and verify alignment before mounting. Mounting hardware is not included.

What engines is this water pump pulley compatible with?
This pulley is designed for Chevrolet Mark IV Big Block applications, including 396, 402, 427, and 454 engines using a short water pump accessory drive.

What size water pump shaft does this pulley fit?
This pulley is designed for a 5/8" water pump shaft and uses a 4-bolt mounting pattern. Verify your water pump shaft size and bolt pattern before ordering.

Does this fit a long water pump Big Block Chevy?
No. This pulley is designed for short water pump configurations only. Long water pump setups use different pulley spacing and require a compatible long water pump pulley.

How many belt grooves does this pulley have?
This pulley has 1 groove and is designed for a single V-belt accessory drive.

Can pulley diameter affect engine cooling?
Yes. Water pump pulley diameter affects water pump speed relative to engine speed, which can influence coolant circulation. Verify that the 6.600" diameter is appropriate for your accessory drive configuration.

Is this pulley aluminum or steel?
This pulley is constructed from aluminum with a natural finish.

Does this come with mounting hardware?
No. Mounting hardware is not included. The pulley is sold individually and uses a 4-bolt mounting pattern.

What vehicles commonly use this water pump pulley?
It can be used on compatible Big Block Chevy applications such as the Chevelle, Camaro, Corvette, C10/C20, Impala, El Camino, and Monte Carlo when equipped with a Mark IV 396–454 engine and short water pump accessory drive.

Will this pulley affect emissions compliance?
This is a mechanical accessory drive component and does not directly modify the engine's emissions-control system.