[72chevynut]

Originally Posted by Jason Banks

According to this page 3929746 is for 1968, 1969-70 366 or 427 engine from a medium duty truck:

http://www.gmpartswiki.com/getpage?pageid=63055

Cool, so it’s a factory part year correct. I’m not sure what model truck it came out of just that it was a 1970. It was pulled for LS engine swap at a car restoration shop. Thank you for the information.