mustang303Street Performance. This Ford Racing cam is a great replacement choice for excellent Low and Mid Range Torque, and a Good Idle. The Ford Racing E303 Performance Camshaft is also aFitment 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 pistons