427ci LS Darton Sleeve MID- Short Block

427ci LS Darton Sleeve MID- Short Block


Bare block- Darton MID wet sleeves installed in a used aluminum LS block. This includes: pressure test for cracks, cleaning, boring, decking, finish torque plate honing, align honing, and cam bearings/ galley plugs installed. Bored to 4.125”. Will clear 4” stroke.

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  • Crankshaft is forged steel 4340 4” stroke

  • Rods are forged steel 4340 H beam 6.125”

  • Pistons are forged DSS Racing -15cc dish

  • Clevite P performance bearings

  • Moly performance rings

  • Hand fit clearances with build sheet included

  • 24 or 58x reluctor

  • Computerized balanced

  • Approximate Compression Ratio: (64cc Head = 10.92 to 1) (66cc Head = 10.70 to 1) (72cc Head = 10.09 to 1)