ATK Engines SP108 Block Information:

• Dart Big M Sportsman 4 bolt main 2pc rear main seal
• Bore/Stroke: 4.600 in. x 4.750 in.
• Displacement: 632ci
• Camshaft Bearings: Dura-Bond, installed and clocked to OEM position
• Freeze Plugs: Brass, installed and sealed
• Oil Galley Plugs: Installed and sealed

ATK Engines SP108 Rotating Assembly:

• Crankshaft: Scat 4340 forged
• Balance: Internally balanced
• Rods: Scat 4340 forged H beam with ARP 8740 bolts
• Compression Ratio: 112cc = 11.3:1 / 118cc = 10.8:1 / 121cc = 10.6:1 (can vary due to deck height/gasket thickness)
• Pistons: 2618 Forged +3.4cc Flat Tops
• Rings: Plasmamoly

ATK Engines SP108 Recommended Components:

• Balancer: Internal balance
• Flexplate/Flywheel: Internal balance
• Head Gasket: .038 in. thickness or per application
• Oil: 10W30 Conventional / Non Synthetic for first 3000 miles
• Oil Filter: Wix or K&N per application

Emissions Note:

This part is only legal for sale and use on Uncontrolled (Non-Emissions Controlled) Vehicles or on vehicles used solely for the purposes of closed competition racing.

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