HPR Forged 416 LSA/LS3 Short Block

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  • Regular price $5,665.75

HPR 416 LSA Short block


Starting with GM's potent LSA engine block, we have designed this short block with larger displacement for those running high boost levels, or larger superchargers.  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 8 bolt, 4.00" stroke crankshaft is used in place of the OEM forged unit.  K1 forged H beam connecting rods with APR hardware support our own design Wiseco piston and ring package.  Wrist pins are upgrade to tool steel S718 pieces for added strength.   Approx compression ratio depending on head chamber size and gasket used is 9.1:1

Those wanting a build without the piston oil squirters can receive the same build using a new LS3 block for a lower cost (see options). 

  **2020 GM has stopped production on the LSA - these prices assume you have a good core to start from**


  • New GM LS3 aluminum block or customer supplied LSA
  • ARP Main stud kit
  • Forged 8 bolt, 4.000" stroke crankshaft
  • Forged connecting rods by K1 Technologies
  • HPR spec pistons by Wiseco
  • HPR designed and spec piston ring pack
  • All components Ultra Sonic washed before assembly
  • Machine work and assembly done in house at HPR
  • Your choice of 24x or 58x crankshaft reluctor wheels
  • Short post crankshaft for wet sump oil systems



 **Timing chain, camshaft, and oil pump NOT included

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