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Shop our selection of used differential parts and accessories for your vehicle.

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417 Motorsports

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Description: This 427ci LS short block set is intended for big power builds. The Compression Ratio is a boost-friendly 9.75:1 when paired with a 68cc combustion chamber. Check out this parts list: Dart SHP Pro Block Callies' Fully Counterweighted (CCW) Magnum Crankshaft Calico Coated Rod and Main Bearings Callies Ultra Enforcer or Dyer's NH Series Double Banded Forged Connecting Rods depending upon availability Diamond 2K Pistons .225 Wall Wrist Pin 12 Degree (LS7) Valve Reliefs -20cc Dish The Dart LS Next SHP Pro is the newest in Dart's line of LS Next engines blocks. The difference between the "Pro" and the SHP LS Next block are the metallurgy and standard main studs instead of bolts. The Pro has a higher nickel content for 30% higher tensile strength so it can handle more power. SHP Line Features - Full side skirts to accommodate OE oil pans - Accepts LS style Oil filters - Retains all factory bolt hole locations LS Next Features Retains all of the LS Next designs features not found in competing blocks including but not limited to: - Longer cylinder sleeves, - Priority main oiling - 4 bolt splayed main saddle structural This 427 cubic inch short block come from its 4.125" bore and the 4.00" stroke of its Callies' center counterweighted Magnum crank. The center counterweighted Magnum crank has a 4.000" stroke and is made from 4340 Timken alloy. The center counterweights are a major upgrade as they increase the cranks stiffness by about 25% while reducing harmonics. The net result is less stress on the main bearings and longer engine life. Watch the video below to learn more. We use either Callies Ultra Enforcer or Dyers NH rods depending upon availability. The Dyers NH H-Beam connecting rods have a unique double-banded cap for an ultimate strength to weight ratio. They are manufactured from 300M steel alloy which is 20% stronger than 4340 steel alloy. The Dyers rods weigh in around 670 grams versus 705 grams for the Callies 4340 alloy I-Beams. The Ultra Enfor