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 pistonsRoamer Mustang 303. Jump to Latest 4.1K views 16 replies 4 participants last post by demonfinder Jan 28, 2025. nobattery1 Discussion starter. 26 posts · Joined 2022 Add to