• One question that both fans and mechanics frequently have when working on a Chevy engine build or upgrade is if BBC (Big Block Chevy) and SBC (Small Block Chevy) starters are interchangeable.
• Even if they can seem comparable at first there is more to the answer than a simple yes or no.

• We’ll go over the main distinctions parallels and things to consider before replacing or buying a starter for your Chevy engine in this blog.

What’s the Difference Between SBC and BBC?

Let’s first explain engines in general before getting into starters in particular:

• Chevrolet debuted the SBC (Small Block Chevy) family of V8 engines in 1955. 305 327 350 and 400 cubic inches are common sizes.

• Big Block Chevy (BBC) engines have more displacement and torque potential due to their larger size. The 396 427 and 454 cubic inch BBC engines are common.

• BBCs are frequently utilized in high-performance applications like as drag racing muscle vehicles and boats because of their size and power.

• Can you swap out the starters?

1. Bolt Pattern for Mounting
   This is the most important element. Chevy mounted starters using two distinct bolt patterns: The majority of SBCs with smaller flywheels have a straight bolt pattern. Bolt patterns that are staggered are typical of BBCs and SBCs with larger flywheels. Therefore only if the bolt pattern and flywheel size match can a starter from an SBC fit a BBC.

2. Size of Flywheel/Flexplate
   There are two flywheel sizes that Chevy engines usually use: A smaller flywheel with 153 teeth A bigger flywheel with 168 teeth One or the other is what starters are made for. It won’t engage properly if you attempt to use a starter designed for a 153-tooth flywheel on a 168-tooth flywheel and vice versa.
3. Design of Nose Cones
   Because the engine is larger some BBC starters have a different nose cone design to clear oil pans or headers. Older or stock-style starters may have clearance problems even though many aftermarket high-torque micro starts are designed to accommodate both SBC and BBC.

Aftermarket Starters: What About Them?

• A large number of aftermarket small starters are made to work with both SBC and BBC applications. These frequently include:

• Mounting blocks that can be adjusted for bolt patterns that are staggered or straight

• Both 153- and 168-tooth flywheels are compatible.

• Small size for oil pan and header clearance

• An aftermarket starter is frequently the greatest option if you’re designing a high-performance engine or just want an easier installation.

In conclusion are they identical?

• Yes depending on your particular engine arrangement, BBC and SBC starters can be the same but they are not usually the same. Always make sure:

• The pattern of bolts

• The number of teeth in the flywheel and flexplate

• The clearance and design of the starter’s nose cone

• Consult the specifications of your engine or get a high-quality universal-fit tiny starter if you’re not sure.

Pro Tip:

• To avoid grinding and early wear it’s a good idea to check the teeth of your flywheel and flexplate while replacing your starting. You should also properly shim the starter.