A Chevy engine with casting number 10066036 what year is it?

The casting number 10066036 is for a Chevrolet 350 cubic inch small-block engine. However, that casting number alone doesn't specify the year. The casting number indicates the block's design, not the year it was manufactured. Chevrolet used this casting number across multiple years. To determine the year, you would need additional information, such as:

* The date code: This is usually stamped on the block itself (often near the driver's side head) and consists of letters and numbers that indicate the manufacturing date.

* The heads: The casting numbers on the cylinder heads can help narrow down the possibilities.

* Other markings: Other markings on the engine (such as on the intake manifold or other components) can provide clues.

Without additional information, it's impossible to pinpoint the exact year of manufacture for a Chevy engine with casting number 10066036.