mustang303Fitment Notice. 1985 Mustang 5.05.8 w factory hydraulic roller cam block; 1986 Mustang 5.05.8 w factory hydraulic roller cam block. May require the stock 5.0 flat-top pistonsFord’s famous Alphabet Cams (a.k.a. Letter Cams) have been around for decades and are often the go-to choice for Mustang owners looking for more performance from their