Description
ATK HP21 Ford 408 Stroker Base Engine 430HP
Engine Specifications:
- HP: 430
- TQ: 500
- Block: Seasoned OE roller block 1993-1997
- Bore/Stroke: 4.040 x 4.000
- Displacement: 408
- Crankshaft: Scat nodular iron internal balance
- Rods: Scat 4340 forged I beam with ARP 8740 bolts
- Pistons: Forged 10.1 compression
- Rings: Moly
- Camshaft: Hyd. Roller
- Cam Specs: 220/224 @50 .512in/.512ex 112LSA
- Timing Chain: Double roller
- Cylinder Heads: Dart aluminum 58cc/170cc 2.02/1.60
- Rocker Arms: Aluminum 1.6 roller rockers
- Oil Pan: Front sump
- Oil Pump: Melling high volume
Recommended Components:
- Balancer: Internal balance
- Flexplate/Flywheel: Internal balance
- Intake Manifold: Edelbrock performer RPM dual plane #7181
- Distributor: Pro billet RTR (with upgraded melonite or steel gear)
- Water Pump: Per application
- Carburetor: Quick Fuel 780CFM vacuum secondary’s electric choke #HR-780
- Fuel Pump: Holley mechanical 110GPH #12-289-11
- 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: 13726548
- Octane: 91+
- Stall Converter: 2200-2500
- Exhaust: 1 5/8 – 1 3/4 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 # | HP21 |
| Brand | ATK Engines |
| Engine Displacement | 6.7 liters |
| Compression Ratio | 10.0:1 |
| Camshaft Type | Hydraulic Roller |
| Cylinder Head Material | Aluminum |
| Carburetor Included | No |
| Intake Manifold Included | No |
| Distributor Included | No |
| Valve Covers Included | Yes |
| Engine Balance | Internal |
| Cylinder Heads Included | Yes |
| Rear Main Seal Style | 1-piece |
| Throttle Body Included | No |
| Oil Pan Included | Yes |
| Timing Cover Included | Yes |
| Water Pump Included | No |
| Harmonic Balancer Included | Yes |
| Flexplate Included | Yes |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
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