Hello everyone really appreciate all the help I've been getting. I'm trying to find out how much is interchangeable with the 216 chev flat heads and the 213 olds. I'm hoping its only bigger bore or stroke. But any help would be great.

thanks everyone

 

The 216 Chevy is an overhead valve engine . The 213 Olds is a " Flathead " .
Nothing interchanges between the two .

 

What parts and year are you looking for? Some of the early engines were made for a number of years with little change. The longer it was made usually the easier it is to find parts. Have you tried Kanter?.... Tedd