What valve covers did the 1966 352 engine come from the factory with?
I have seen 2 types that are purported to be OEM. One has writing stamped in them, "Powered by Ford" or just plain and kinda pointed at the top like in the photo.
Could the difference be 353 vs 390?

 

I think yours are correct. In this thread https://www.ford-trucks.com/forums/1...r-cleaner.html NumberDummy gives the application for the embossed covers, in post # 9.

 

Yes the correct ones are the pent roof style without any lettering. The power by Ford ones came later, I think around 67 or maybe a few years later.

 

Thanks guys. Pent roof it is!

 

No 390 in 1966, but those valve covers will fit both 352 and 390.