$3,949.00
Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1
[BK421R-5BLW]
Block & Ultra Lite Rotating Assembly-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1
These Dart/Scat/CP SHP Block and Balanced Rotating Assemblies offer race proven quality components at a greatly reduced package price. Dart SHP blocks, forged 4340 crankshafts, Ultra Lite H-beam rods, forged pistons and file fit rings are standard in these popular combinations.

  • 421 cubic inch
  • 4.155 bore x 3.875 stroke
  • Also available with 4.125 bore - 415cid
  • Dart SHP Block - 9.025 deck
  • Scat F-43 Lite Weight 4340 Forged Crankshaft - 350 mains
  • Pendulum cut counterweights w/Aero wing machining
  • 45-47 lb crank with gun drilled mains
  • Premium Molnar 6.00in Lite weight H-beam stroker rods - 553 gm
  • 3/8 ARP2000 bolts with special asymetrical threads
  • SRP Pro Forged Pistons -5cc flat top
  • Comp ratio w/64cc= 12 to 1
  • 4.125 bore = 402gm, 4.155 bore = 411gm
  • 2.250in x .150 wall pins = 106gm
  • File Fit steel top & napier 2nd rings 1.2x1.5x3mm
  • Coated & grooved cam bearings
  • King Tri-metal XP Performance rod & main bearings
  • Precision Balanced
  • Brass freeze plugs & steel cam plug
  • Also available with CP-Carrillo 5cc dome piston 13.8-1

Also Available with Dart SHP PRO BLOCK

Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1

Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1Block & Ultra Lite Rotating Assem-BALANCED-421 cid, Dart SHP Block, LiteWt Crank, UltraLite Rod 12-1
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This product was added to our catalog on Sunday 29 December, 2013.  
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