Originally Posted by
66f-100
The 390 heads have larger ports than the 352,
I compared the two when my 352 was getting rebuilt.
Uh huh, so what's this?
C4AZ6049C .. Cylinder Head / Fits: 1964/67 352/390/410 & some 428's / Use without smog pump.
Besides using the same heads, the 352/390 used the same valves, pushrods, valve springs, the whole valve train is exactly the same.
In 1968, Ford replaced C4AZ6049C with C8AZ6049M. These heads are the same as 1968/71 390/428 (except 428 P/C & HiPo).
I dunno what heads your 352 had, but I know mine were the originals since I bought the truck new.
Some much has been swapped around, who know what heads an FE engine may have?
The C8AZ heads were used by Ford authorized engine rebuilders, so these same heads could be found on all FE engines except 352 HiPo's (1960 only), 1961/63 390 HiPo's, 406's & 427's.