Description
ATK HP55C-EFI Chevy 383CI with FITECH EFI 500HP
Engine Specifications:
- HP: 500
- TQ: 505
- Block: OE roller block 4 bolt main 1pc seal 1996-2000
- Bore/Stroke: 4.040 x 3.750
- Displacement: 383
- Crankshaft: Scat 4340 forged external balance rear of crank/internal balance front of the crank
- Rods: Scat 4340 forged H beam with ARP 8740 bolts
- Pistons: Forged 10.2:1` compression
- Rings: Moly
- Camshaft: Hyd. roller
- Cam Specs: 237/245 @50 .597in/.597ex 112LSA
- Timing Chain: Double roller
- Cylinder Heads: Dart SHP American Made aluminum 72cc/200cc 2.02/1.60
- Rocker Arms: Billet aluminum 1.6 roller rockers
- Oil Pan: Rear sump 5qt (not for Chevelles with steering behind crossmember, some corvettes and 62-67 chevy II’s)
- Oil Pump: Melling
- Balancer: PowerBond internal balance 8” #PB1046-N
- Flexplate/Flywheel: Pioneer #FRA-159 external balance 168 tooth (with Scat kit)
- Intake Manifold: Edelbrock performer RPM air gap #7501
- Distributor: Pro billet (Iron gear)
- Water Pump: Weiand action + long pump #9240
- EFI System: Fitech Go EFI 4 600HP (throttle body, wire harness and handheld unit included)
- Fuel Pump: Not Provided – must run electric pump or mechanical fuel pump with Fitech Fuel Command Center
- Spark Plugs: Autolite #3923
- Spark Plug Wires: 8mm
Engine Info:
- Oil: Conventional / Non Synthetic 10W30
- Oil Filter: Wix or K and N per application
- Timing: 34-36 Degrees
- Spark Plug Gap: .035”
- Firing Order: 18436572
- Octane: 91+
- Stall Converter: 2800+
- Exhaust: 1 ¾+ Headers
Disclaimer:
The parts listed are ATK’s recommendations of parts to be used to obtain our power figures listed. Power figures can vary based on parts used by the end user. It is the customer’s responsibility to verify components will work in their application. Some modifications to the vehicle may be required using these and or other aftermarket parts. ATK reserves the right to substitute parts used in engines if necessary.
| KEY SPECS | |
|---|---|
| MFG. Part # | HP55C-EFI |
| Brand | ATK Engines |
| Engine Displacement | 6.3 liters |
| Compression Ratio | 10.2:1 |
| Camshaft Type | Hydraulic Roller |
| Cylinder Head Material | Aluminum |
| Carburetor Included | No |
| Intake Manifold Included | Yes |
| Distributor Included | Yes |
| Valve Covers Included | Yes |
| Engine Balance | Internal/External |
| Cylinder Heads Included | Yes |
| Rear Main Seal Style | 1-piece |
| Throttle Body Included | Yes |
| Oil Pan Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | Yes |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | Yes |
| Spark Plug Wires Included | Yes |
| Computer Included | Yes |
| Wiring Harness Included | Yes |
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