My understanding is that the crossflow head came out in '76 (and was developed using the Cleveland valve arrangement) with the introdution of the XC Falcon, Alloy head came out in '81(?) the Alloy Head Two was developed further with the help of Yamaha. 1982 saw the introduction of EFI in Fairlanes & LTDs. Unleaded motors came out in '86.
I think the '88 EA Falcon 6 was totally redesigned.
(if I'm wrong about anything feel free to correct me)
Cheers
Jamie
ps I can take photos of the motors I have if anyone is interested.
