What kind of lifters came on 1987-1993 5.0s?

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Either hydraulic, roller-tappet or hydraulic, flat-tappet. Solid, flat-tappet cam and lifters haven't been OE since the late 60s. The older vans and trucks had flat-tappet cam and lifters. The newer (well after the Mustang) vans and trucks had roller cam and lifters.

The Mustang's H.O. 5.0L engine first got roller-tappet cam and lifters in the '85 model year (4V only - the CFI version still used the flat-tappet cam and lifters).