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.Please don't quote clueless magazine articles as if they had some basis in fact. The 427 1968 Mustang and Shelby didn't exist so speculating on why is pointless and a waste of time. The 427 Cougar GTE's were produced and many original cars are documented and several are still in the original owner's garages. All are crossbolted and hydraulic lifter equipped side oilers. There were 357 427 Cougars built in 1968. About 155 are known to exist.
68 427 GTE Cougars (two of them)
68 1/2 Cougar 428 CJ Ram Air
If you would have read my message closer you have seen I said it was at least a 66 block because of that casting number. I did NOT say that made it a 427. It is a standard bore 427 and my main indication of it being a 427 was the squared off cylinders and the fact that it weighs about 25 lbs. more than my 428 block, which also has 66 427 cast into it.Ford used the rear face mold with 427 - 66 cast into it on all FE sizes after 1966 randomly. Like many other casting marks it is meaningless. I have owned 390's and 428 CJ's with that casting.
68 Cougar GTE 427 (two of them)
68 1/2 Cougar 428 CJ