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Short Blocks / Short Blocks - Stage 1, 2, 3 and Race Prepped Blocks

JR Motorsports Classic Shortblocks

Description:

The JRM Classic series shortblocks are intended for racing from beginning to end.
We prepare and machine each block and assembly to precise tolerances and assure
that quality components are chosen with the "claim-type" rules in mind.
Our sales staff or engine shop will assist you in engine and camshaft selection to
complete your short-block and at the same time discreetly keep your combination private.

Short Block Feature

  • All Classic Series includes full balance
  • Price listed does not include camshaft, timing chain, cam button, cam lock, and degreeing in of the cam
  • 383,406 includes balancer and balance plate
  • 355,377 include performance reground crankshaft
  • 383,406 include Scat crankshaft
  • 377,406 are deck plate honed
  • Fully prepped block
  • Align honed
  • Square decked with BHJ 90 deg. fixture
  • Race prepped rods with ARP bolts
  • Speed-Pro hypereutectic pistons
  • Performance moly rings
  • Brass freeze plugs
  • Screw in oil restrictors
  • All JRM Shortblocks include engine stand
  • Clevite 77 rod & main bearings
  • Completely clearanced and assembled
  • Designed for racing use only
  • No warranty
  • Must be shipped by Truck Freight
  • To add a PRC solid lifter cam, double row timing chain, cam button, cam lock plate, and degreeing in of the camshaft, add $139.96

JR Motorsports Classic Shortblocks

Select Product To Purchase
Part # Product Name Engine Size Dome Compression Ratio 64cc Compression Ratio 6cc Rod Length Price Qty / Add To Cart
MTR C355F4 JR Motorsports Classic Shortblocks 355ci Flat Top 9.7 8.6 5.7 $1,210.03
MTR C355F2 JR Motorsports Classic Shortblocks 355ci Flat Top 9.9 8.8 5.7 $1,312.43
MTR C355F2I JR Motorsports Classic Shortblocks - Includes 4130 Scat rod & Scat cast crank 355ci Flat Top 9.9 8.8 5.7 $1,390.03
MTR C355D1 JR Motorsports Classic Shortblocks 355ci .125 10.7 9.4 5.7 $1,440.03
MTR C355D2 JR Motorsports Classic Shortblocks 355ci .250 11.9 10.3 5.7 $1,440.03
MTR C355D2I JR Motorsports Classic Shortblocks - Includes 4130 Scat rod & Scat cast crank 355ci .250 11.9 10.3 5.7 $1,640.03
MTR C377F JR Motorsports Classic Shortblocks - 377 assemblies include bearing spacers 377ci Flat Top 10.7 9.4 5.7 $1,860.03
MTR C377D1 JR Motorsports Classic Shortblocks - 377 assemblies include bearing spacers 377ci .150 12.1 10.5 5.7 $1,860.03
MTR C383F JR Motorsports Classic Shortblocks 383ci Flat Top 10.3 9.2 5.7 $1,640.03
MTR C383D1 JR Motorsports Classic Shortblocks 383ci .100 11.5 10.1 5.7 $1,640.03
MTR C383D2 JR Motorsports Classic Shortblocks 383ci .200 12.4 10.7 5.7 $1,640.03
MTR C383D2I JR Motorsports Classic Shortblocks - Includes 4130 Scat rod & Scat cast crank 383ci .200 12.4 10.7 5.7 $1,760.03
MTR C406F JR Motorsports Classic Shortblocks 406ci Flat Top 11.4 10.1 5.7 $1,840.03
MTR C406D1 JR Motorsports Classic Shortblocks 406ci .100 12.1 10.6 5.7 $1,840.03


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Freight will be added to all orders after we receive the order.