Richard Holdener
July 5, 2013

5.0L Performance Packages-363 Stroker

5.0L Stock vs. Modified 363 EFI

Engine Specs-Modified 363 (EFI)
Displacement 363 ci
Bore 4.125
Stroke 3.400
Pistons Stock flat-top
Forged Yes
Compression 9.4:1
Rods Scat 5.40-inch H-beam
Forged Yes
Heads AFR 225 CNC
Aluminum Yes
Iron No
Ported Yes
Intake Valve 2.08-inch
Exhaust Valve 1.60-inch
Chamber Size 72cc
Upper Intake TFS Box R
Ported No
Lower Intake TFS Box R
Ported No
Throttle Body 90mm Accufab
Injector Size 75-lb/hr
Fuel System Aeromotive
EFI System Holley Dominator
MAF Stock Ford (not used on engine dyno)
Custom Chip No
Distributor Stock (MSD used on dyno)
Header (style) Hooker Super Comp long-tube
Header Size 13⁄4-inch
Cam Cam Research solid-roller (hyd/solid-roller)
Intake Lift 0.736
Exhaust Lift 0.727
Int Dur Degrees 254 @ 0.050
Ex Dur Degrees 252 @ 0.050
LSA 112
Rockers Crane Gold roller
Ratio 1.7:1
Exhaust 3.0-inch with Borla mufflers
Max Power Output (dyno) 519 hp @ 6,600 rpm
Max Torque Output (dyno) 472 lb-ft @ 5,100 rpm

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.

22. Feeding the beast was a Holley 950 HP carburetor. Fuel flow came courtesy of a complete Aeromotive fuel system.

Engine Specs-Modified 363 (Carb)
Displacement 363 ci
Bore 4.125
Stroke 3.40
Pistons Mahle flat-top
Forged Yes
Compression 11.5:1
Rods Scat 5.4 H-beam
Forged Yes
Heads Dart Pro 1 225 CNC
Alum Yes
Iron No
Ported Yes
Intake Valve 2.08-inch
Exhaust Valve 1.60-inch
Chamber Size 62cc
Intake Parker Funnel Web
Carburetor Holley 950 HP
Spacer No
Fuel System Aeromotive
Distributor Stock (MSD used on dyno)
Header (style) Hooker Super Comp long-tube
Header Size 13⁄4-inch
Cam Cam Research solid-roller (hyd/solid-roller)
Intake Lift 0.692
Exhaust Lift 0.692
Int Dur Degrees 256 @ 0.050
Ex Dur Degrees 260 @ 0.050
LSA 105
Rockers Crane Gold roller
Ratio 1.7:1
Exhaust 2.5-inch with Borla mufflers
Max Power Output (dyno) 564 hp @ 6,800 rpm
Max Torque Output (dyno) 487 lb-ft @ 5,200 rpm

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.

24. Run in anger with a healthy solid-roller cam from Cam Research Corp, the carbureted 363 produced 564 hp at 6,800 rpm and 487 lb-ft of torque at 5,200 rpm.