* Small-Block V8s: These were very popular. You might find a 283, 307, 327, or 350 cubic inch engine. The 350 was becoming increasingly common by 1970.
* Big-Block V8s: Less common but possible, especially in heavier-duty trucks. These could include 396, 402, or 427 cubic inch engines.
* Inline-6: Chevrolet also offered a straight-six engine, typically a 230 or 250 cubic inch engine. This was a common choice for those seeking better fuel economy.
To know *exactly* what engine was originally in a specific 1970 C10, you'd need to check the vehicle's documentation (like the original owner's manual or a build sheet if available) or look for the engine's identification number stamped on the engine block itself.
