ATK Performance 331 Stroker Shortblock, forged

ATK Performance 331 Stroker Shortblock, forged

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Part# SP13


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ATK Performance 331 Stroker Shortblock, forged

This shortblock is a great starting point for a naturally aspirated or boosted street engine capable of 500+hp. Assembled and ready to bolt on your heads, cam, intake etc. Here's the specs.

  • Block: Seasoned OE Roller Block
  • Bore/Stroke: 4.040 x 3.250
  • Displacement: 331 C.I.D.
  • Crankshaft: SCAT Nodular 3.250" Stroke 1 Piece Seal Externally Balanced 28oz.
  • Connecting Rods: Scat 4340 Forged I Beam 5.400 w/ARP 8740 Bolts
  • Pistons: Forged +11cc Flat Top w/4 Valve Reliefs
  • Piston Rings: Moly Rings
  • Compression Ratio: 58cc=9.6:1/64cc=9.0:1
  • Camshaft Bearings: Installed and Clocked to OEM Position
  • Freeze Plugs: Brass Installed and Sealed
  • Oil Galley Plugs: Installed and Sealed


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