Featuring a tough bottom end, the ATK SP21 Ford 408 Stroker Short Block 25.8cc works great for your street or strip. Boasting cast iron construction, this engine is fitted with forged components and sealed plugs for durability and reliability. This engine is hand-balanced for a smooth operation.
Short Block Specifications:
- Block: Seasoned OE Roller Block
- Bore/Stroke: 4.040 x 4.000
- Year Range: 1969-1997
- Displacement: 408 C.I.D.
- Crankshaft: Scat 4340 Forged 4.000" Stroke 1 Piece Internally Balanced
- Connecting Rods: Scat 4340 Forged H Beam 6.200" ARP 8740 Bolts
- Pistons: Forged +25.8cc Dished With 2 Valve Reliefs
- Piston Rings: Moly Rings
- Compression Ratio: 58cc= 9.9:1/64cc= 9.4:1/70cc= 8.9:1
- Camshaft Bearings: Installed & Clocked to OEM Position
- Freeze Plugs: Brass Installed & Sealed
- Oil Galley Plugs: Installed & Sealed
Every great build needs a solid foundation! For that reason, we take the hard work out of the picture by selling short blocks that are ready for you to complete yourself. Our GM Short Blocks are most commonly packaged as the engine block assembled with Pistons, Piston Rings and Crankshaft installed.
ATK specializes in muscle. With the highest quality internal parts and Dyno Proven combinations of every engine built, ATK is able to add the most bang for your buck and back it up with an industry leading warranty.
ATK High Performance Ford 408 Stroker Race Series Short Blocks
• Oil: 10W30
• Harmonic Balancer/Damper: Professional Products #80006 with WEIGHT REMOVED/ Internally Balanced
• Flex Plate / Flywheel: Internally Balanced
• Balancer: Internal
• Flexplate/Flywheel: Internal
• Head Gasket: .047" thickness or per application
• Oil: 10W30 Non syntheitc for first 3000 miles
• Oil Filter: Wix or K&N per application
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 for their application. Some modifications to the vehicle may be required using these and or other aftermarket parts.
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