AustinGriggs said

Not sure I'd call them special but I have only seen 714 casting heads on 1991 model 318s. Some debate can be had on the differences between them an 302 casting heads However, in one flow test I've seen they offered a rather healthy benefit over the strikingly similar 302... (about 8 minutes into this video: ) ...food for thought and I'd like to see that test repeated.

Click to expand...