Where is the oil dipstick hole at on engine block of a 305?

The location of the oil dipstick tube on a 305 small-block Chevy engine (and most small-block Chevys) is on the passenger side of the engine block, typically near the front. It's usually fairly easy to spot; the dipstick itself is often bright yellow or orange. However, its precise location can vary slightly depending on the year and specific modifications to the engine.