5.0L Performance Packages-363 Stroker
5.0L Stock vs. Modified 363 EFI
If a 347 is good, then a 363 must be even better, right? Some might be tempted to think the 363 is some kind of over-bore for the 351W block, but it is actuality a big-bore 347 based on the 8.2-inch-deck 302 block. The 363ci comes with a 4.125 bore combined with the common 3.40-inch stroke used on the smaller 347. Dart supplied the SHP short-block, to which we added a set of (big-chamber) AFR 225 heads, a turbo-grind Cam Research solid-roller cam, and TFS Box R upper and lower intake. In truth, this 363 was designed as a turbo motor and eventually exceeded 1,000 hp at 17 psi. In normally aspirated trim with a Holley EFI system, 90mm Accufab throttle body, and Crane Gold rockers, the injected 363 stroker produced 521 hp at 6,600 rpm and 472 lb-ft of torque at 5,100 rpm. Since the AFR heads will support in excess of 650 hp in normally aspirated trim, wilder cam timing designed for an NA application would certainly allow this motor to strut its stuff. With over 500 hp, it was certainly healthy for something that looked like a 302.
5.0L-Stock vs. Modified 363 Carb
The final stroker assembly was another 363, but one dedicated as a normally aspirated combination. The Dart SHP short-block was equipped with flat-top pistons that combined with Dart Pro 1 225 heads with 62cc combustion chambers. Full CNC porting allowed them to flow 325 cfm, more than enough for this stroker application. Cam Research Corp supplied a hot solid-roller cam that featured 0.736 lift (both intake and exhaust), combined with a 256/260-degree duration split and a tight, 105-degree lobe-separation angle. Toss in some 1.7-ratio roller rockers, a Funnel Web intake, and Holley 950 HP carb and you have the makings of a serious street stroker. Once again we relied on Hooker headers, but this combination would certainly have liked something bigger than the 1¾-inch set we had on- hand. After tuning, the Dart-headed 363 stroker produced 564 hp at 6,800 rpm and 487 lb-ft of torque at 5,200 rpm.