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$275 Shipping
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#35020057
ATK SP108 Chevy 632CI Short Block +3.4cc Flat Tops
- Flexplate/Flywheel: Internally balanced – Pioneer #FRA-478 (requires Ext. balanced converter)
- Balancer: Externally balanced
- Intake Manifold: Edelbrock performer RPM air gap dual plane #7577
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Product Summary
Short Block Crate Engine Type, Internal Engine Balance
- Flexplate/Flywheel: Internally balanced – Pioneer #FRA-478 (requires Ext. balanced converter)
- Balancer: Externally balanced
- Intake Manifold: Edelbrock performer RPM air gap dual plane #7577
- Distributor: Pro billet RTR (Iron Gear)
Key Specs
| Crate Engine Type | Short Block |
| Engine Displacement | 10.3 liters |
| Camshaft Type | Hydraulic Roller |
| Piston Material | Forged Aluminum |
| Crankshaft Material | Forged 4340 Steel |
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ATK Engines SP108 Details
Engine Specifications:
- Block: Dart Big M Sportsman 4 bolt main 2pc rear main seal
- Bore/Stroke: 4.600" x 4.750"
- Displacement: 632CI
- Crankshaft: Scat 4340 forged internally balanced
- Rods: Scat 4340 forged H beam with ARP 8740 bolts
- Pistons: 2618 Forged +3.4cc Flat Tops
- Compression Ratios: 112cc = 11.3:1 / 118cc = 10.8:1 / 121cc = 10.6:1 (can vary due to deck height/gasket thickness)
- Rings: Plasmamoly
- Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
- Freeze Plugs: Brass, installed and sealed
- Oil Galley Plugs: Installed and sealed
Recommended Components:
- Balancer: Internal balance
- Flexplate/Flywheel: Internal balance
- Head Gasket: .038" or per application
Engine Info:
- Oil: 10W30 Conventional / Non Synthetic for first 3000 miles
- Oil Filter: Wix or K and N per application
- Head Gaskets: .038" or per application
Disclaimer: The recommended components listed are ATK's recommendations of parts to be used, applications vary and your build may need something different. Contact ATK for a recommendation if you're not certain about a component to use. 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.
CARB Warning
Follow EPA, CARB, and state regulations for engine changes
CARB Warning
Follow EPA, CARB, and state regulations for engine changes
ATK Engines SP108 Specifications
ATK Engines SP108 Specifications
| KEY SPECS | |
|---|---|
| MFG. Part # | SP108 |
| Brand | ATK Engines |
| Crate Engine Type | Short Block |
| Engine Displacement | 10.3 liters |
| Camshaft Type | Hydraulic Roller |
| Piston Material | Forged Aluminum |
| Crankshaft Material | Forged 4340 Steel |
| Carburetor Included | No |
| Intake Manifold Included | No |
| Distributor Included | No |
| Connecting Rod Material | Forged 4340 Steel |
| Valve Covers Included | No |
| Engine Balance | Internal |
| Cylinder Heads Included | No |
| Rear Main Seal Style | 2-piece |
| Throttle Body Included | No |
| Oil Pan Included | No |
| Timing Cover Included | No |
| Water Pump Included | No |
| Harmonic Balancer Included | No |
| Flexplate Included | No |
| Flywheel Included | No |
| Air Cleaner Included | No |
| Spark Plugs Included | No |
| Spark Plug Wires Included | No |
| Computer Included | No |
| Wiring Harness Included | No |
| GENERAL | |
| Assembled | Yes |
| Material Type | Cast Iron |
| GTIN Code | 00653517725128 |
| Notes | Compression options range from 10.6:1-11.3:1 depending on deck height and gasket thickness. |
| Sold in Quantity | Each |
| Connecting Rod Beam Style | H-Beam |
| Deck Height | 10.2" |
| Main Bolt Style | 4-Bolt |
| Piston Style | Flat Top |
| Main Journal Type | Chevy 454 |