Here are some places to look:
* Chevrolet's online resources (unlikely to have detailed diagrams): While Chevrolet's official site might have some general information, detailed diagrams are rare to find online from manufacturers for older vehicles.
* Online Parts Catalogs: Sites like Classic Industries, NPD, Ames Performance, and others that specialize in classic Chevy parts often have detailed diagrams *within their parts catalogs*. You'll need to navigate to the correct year, model, and *specific engine*. These diagrams are usually tied to parts ordering, not simply for viewing.
* Repair Manuals: A factory service manual or a Haynes/Chilton repair manual specifically for a 1966 Chevelle with the correct engine is your best bet. These manuals typically contain very detailed diagrams of the engine, often exploded views showing all components and their locations. You can find these manuals online (eBay, Amazon) or through specialty automotive booksellers.
* Online Forums & Communities: Classic car forums dedicated to Chevelles (e.g., forums on sites like Chevelles.com) may have members who have scanned diagrams or can point you to good resources.
* Automotive Libraries (if available locally): Some libraries, especially those near universities with automotive engineering programs, may have collections of older repair manuals.
In short: Don't search broadly for a "1966 Chevelle engine diagram." Be specific about the *engine itself* (e.g., "1966 Chevelle 327 engine diagram"). This will dramatically improve your search results.
