Small Block Ford Accessory Drive Tutorial: Everything You Need to Know

The Small Block Ford is one of the most iconic and widely used performance engines in American motorsports — but when it comes to accessory drives, it's also one of the most confusing. At CVF Racing, we've spent a vast amount of time dissecting the various SBF combinations, collecting samples of water pumps, balancers, timing covers, and blocks, and measuring and test fitting to find the most comprehensive solutions for our customers.

This guide focuses on the 289/302/351W and what you need to know for accessory drive selection. We'll keep it as clear as possible.

Standard Rotation vs. Reverse Rotation

Ford ran standard rotation water pumps in the SBF from the beginning up until around the mid-1980s. Here's how to identify which rotation you have:

• Bolt circle: Standard rotation pumps have a 1.75" bolt circle; reverse rotation pumps have a 2.06" bolt circle. (Note: some aftermarket manufacturers didn't follow this convention.)
• Belt type: A V-belt or ribbed serpentine pulley = standard rotation. A smooth (no grooves) serpentine pulley = reverse rotation.
• Impeller inspection: Remove the pump, look at the back with the lower hose pointing down, and position a blade at 12 o'clock. Flat side of blade facing left = standard rotation. Flat side facing right = reverse rotation.

Timing Covers

There are essentially three SBF timing covers:

• Standard Rotation (CW): Many variations exist (dipstick, crank sensor, fuel pump provisions), but all share the same dimensions, bolt pattern, and cooling passages.
• Early Reverse Rotation (CCW): Same dimensions and bolt pattern as standard, but cooling passages are angled differently.
• Late Reverse Rotation (94 Cover): Different dimensions, different bolt pattern, vastly different cooling passages. Used for such a short time that most aftermarket manufacturers don't engineer around it.

Water Pumps

SBF water pumps changed over the decades:

• Early pumps: Passenger side lower radiator hose, 5.4" hub height
• 1970s pumps: Driver side lower radiator hose, 5.7" hub height
• Ford Racing "Shorty" pump: Driver side lower radiator hose, 4.5" hub height
• Reverse rotation (80s+): Used with the 5.0L/5.8L engines

Balancers

Balancers changed alongside water pumps and this is where alignment offsets get tricky:

• Early 3-bolt balancer: Balancer face to water pump flange = 3-7/8"
• Later 4-bolt balancer: Balancer face to water pump flange = 3-1/4" (nearly 1" taller than 3-bolt)

The aftermarket muddied the waters by putting both bolt patterns on many balancers. Here's how to interpret aftermarket balancers:

• 3-bolt only: Usually OEM replacement spec
• Both 3 & 4 bolt: Usually has 3-bolt dimensional measurements; a crank spacer is needed for 4-bolt pulley alignment
• 4-bolt only: Could be either OEM spec OR 3-bolt offset — it's a coin toss

Selecting the Right Parts

For reverse rotation systems, CVF's 5.0L/5.8L Beast systems are the solution.

For standard rotation water pumps, answer these 3 questions to get the right parts every time:

1. Passenger side or driver side lower radiator hose? This tells you if your water pump is 5.4" or 5.7" tall.
2. 3-bolt, 4-bolt, or both on your damper? This tells us the bolt pattern and possible offsets.
3. Factory or aftermarket damper? Aftermarket 4-bolt dampers are shorter and usually require a spacer for alignment.

CVF has set up our website with radio buttons to guide your selections. If you're still unsure, our knowledgeable tech support staff is always available — call us free at 651.356.8593.