Can any year chevy 350 engine fit in a 86 c10 with 305?

Yes, any year Chevy 350 engine will fit in an 86 C10 with a 305 engine. The 350 and 305 engines are both small-block Chevrolet engines and share the same basic design and dimensions. However, there are some differences between the two engines that you should be aware of before attempting to swap one for the other.

* The 350 engine has a larger displacement than the 305 engine (350 cubic inches vs. 305 cubic inches). This means that the 350 engine will produce more power than the 305 engine.

* The 350 engine may have different cylinder heads, intake manifold, and exhaust manifolds than the 305 engine. You will need to make sure that the parts from your 305 engine are compatible with the 350 engine.

* The 350 engine may require a different camshaft and timing chain than the 305 engine. You will need to consult with a qualified mechanic to determine which camshaft and timing chain are best for your 350 engine swap.

If you are not confident in your ability to perform an engine swap, you should consult with a qualified mechanic. They will be able to help you determine which parts are needed for the swap and can perform the work for you.