This is the engine configuration that launched an entire aftermarket industry-the mass air-equipped 5.0 H.O. Even if you've been around 5.0 Foxes for a while, it's unlikely you've seen too many that are stock. That's a tribute to how adding a tunable fuel-injection to the familiar small-block Ford eased the hot rodder's journey from carburetors to fuel injection. Today it seems simple, but when the original speed-density system debuted in '86, the knee-jerk reaction was to rip off the EFI and add a carburetor. Mass air changed all that and allowed the 5.0 to supplant the small-block Chevy as the mainstream engine for bolt-on speed.