5.0L Stock vs. Modified 302 EFI
These two graphs illustrate the power gains offered by typical bolts-ons to a 5.0L Ford. We have included the horsepower and torque graphs for a bone-stock 5.0L as a reference. Run in stock trim with no accessories, a set of Hooker headers, and tuned with a Holley EFI system, the stock 5.0L EFI motor produced 232 hp at 5,100 rpm and 306 lb-ft of torque at 3,400 rpm. After swapping on a set of CNC-ported heads from RHS, a Crane 224/232 cam, and Holley SysteMax intake system, the power jumped to 395 hp at 6,200 rpm and 380 lb-ft at 5,000 rpm. The number of performance packages that have been applied to the otherwise-stock short-block is staggering, but this is a good example of what can be expected. There is additional power to be had with wilder cam timing, but figure you will start to trade bottom end torque for the gains experienced higher in the rev range.
5.0L Stock vs. Modified 302 Carb
Though wilder applications are obviously possible (we have exceeded 500 hp with a 302), this carbureted combination is typical of what can easily be accomplished with simple bolt-ons. Once again using the stock short-block, the 302 was upgraded with the Crane 224/232 cam, Dart Pro 1 210 heads, and a dual-plane intake. Typical of carbureted applications, the 302 produced slightly more peak power and less torque than the EFI version, with peaks of 401 hp and 370 lb-ft. The Dart heads were capable of supporting a great deal more power, but the limitation was the displacement, cam timing, and intake manifold. With a wilder roller cam, a single-plane intake, and a point or so more compression, 500 hp is a possibility, though with greatly diminished driveability. By contrast, either of the two 302 combinations listed here would be ideal daily drivers.