[Formulajones]

Ford started using roller lifters at least as early as 86 I know for sure and may have been as early as 84 or 5.

As far as longevity on those, guys still do cam swaps in them today and reuse the original lifters. My sons 89 5.0 engine has never been apart and has 256,000 miles on it now. Quiet as a mouse and doesn't use a drop of oil. Bone stock and just came off the chassis dyno where it made 231/277 at the tire. Now he wants a cam upgrade and I'll most likely just stab the original lifters right back in it.