If you’re a car enthusiast, you likely know the difference between a big block Chevy and a small block Chevy engine. However, if you’re a novice, or just looking to identify a big block Chevy engine, it can be a tricky and confusing task. Fortunately, there are a few simple steps you can take to identify the engine in your car or a car you’re considering purchasing. In this article, we’ll go over the basics of identifying a big block Chevy.
Table of Contents
Know the Different Classes of Chevy Engines
The first step in identifying a big block Chevy is to become familiar with the different classes of Chevy engines. Generally, Chevy engines can be divided into two main categories: small block and big block. Small block Chevy engines typically fall between 262 and 400 cubic inches and are commonly found in vehicles from the mid-1960s to the early 2000s. Big block Chevy engines, on the other hand, typically range from 402 to 454 cubic inches and are usually found in vehicles from the late 1960s to the early 2000s.
Identifying the Block
The next step to take when identifying a big block Chevy is to examine the block itself. Big block Chevy engines are physically larger than small block Chevy engines, so you should be able to tell the difference just by looking at the two side-by-side. Another way to identify a big block Chevy is to look for the distinctive “big block” logo that was stamped into the side of the engine block. This logo was typically found on engines produced from 1965 to the early 1970s.
Examine the Heads
The next step to take when identifying a big block Chevy is to examine the heads. Big block Chevy engines have larger, taller cylinder heads than small block Chevy engines. They also have larger intake and exhaust ports. This is an easy way to tell the difference between the two, just by looking at the engine.
Check the Intake Manifold
The next step is to check the intake manifold. Big block Chevy engines typically have a large, single-plane intake manifold, while small block Chevy engines typically have a dual-plane or “V” shaped intake manifold. This is another easy way to tell the difference between the two engines.
Look at the Pistons
Finally, you can look at the pistons to identify a big block Chevy. Big block Chevy engines typically have larger pistons than small block Chevy engines. This is another easy way to tell the difference between the two.
Conclusion
Identifying a big block Chevy engine isn’t too difficult, as long as you know what to look for. By examining the block, heads, intake manifold, and pistons, you should be able to tell the difference between a big block Chevy and a small block Chevy engine. Once you have identified the engine, you can then go on to diagnose any potential problems.
