HPR Forged 429 LS3 Short Block

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  • Regular price $9,625.50

HPR 429 LS3 Short block


Starting with GM's potent LS3 engine block, we have designed this short block with for those wanting more displacement without sleeving their blocks.  Moving to the 4.125 stroke crankshaft combined with our custom lightweight pistons these short blocks make a great street or track weapon all motor.   ARP main studs are installed before checking main bearing housing sizes, then correctly machined.  Piston bores are torque plate honed to size and to our exacting finish standards.  Forged 8cw Callies Compstar crankshafts are available in either std post or LS7 style.  Forged H beam connecting rods with ARP rod bolts standard.  HPR spec forged 2618 alloy pistons with Total Seal ring package


  • New GM LS3 aluminum block or customer supplied LSA
  • ARP Main stud kit
  • Callies Compstar 4.125 stroke 8cw forged crankshaft
  • Forged connecting
  • HPR spec forged piston set, 4cc net dish w/reliefs
  • HPR spec Total Seal ring package
  • All components Ultra Sonic washed before assembly
  • Machine work and assembly done in house at HPR
  • Your choice of Billet 24x or OE 58x crankshaft reluctor wheels
  • Std or LS7 post crankshafts


***ALL ENGINES ARE BUILT TO ORDER - Please contact your sales rep for build time and ETA