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JR Race Car ZRK-8000

ZR4 Engine Kit 3-3/4" Bore

JR Race Car ZRK-8000


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Estimated ship date 07/31/17 if Ordered Today
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JR Race Car ZRK-8000 ZR4 Engine Kit 3-3/4" Bore $5,324.99
ZR4 Engine Kit
  • 3-3/4" Bore

  • JR Race Car ZRK-8000 Details

    Engine Kits

    ZR4 3 3/4" complete engine kit, capable of going 7.90 with a 480+ lbs. package at sea level.
    Kit components:

  • ZR4 Billet Block (sleeved, bored and honed)
  • ZR4 Billet head with o-ring stud kit
  • ZR4 Billet head gasket (0.015, 0.021, 0.027, 0.032, 0.042, 0.060)
  • ZR Billet side cover wiht hardware kit
  • ZR4 Billet breather with hardware kit
  • JRC 0.563 stroke Billet crankshaft with 1" journal
  • Hardened crank gear with key
  • Crank bearings
  • Crank seals
  • JRC 4.375" Billet connecting rod
  • JRC piston with rings, 0.590 wrist pin, and clips
  • ZR4 Billet camshaft (0.509" lift)
  • Cam bearings
  • 5/16" diameter lifters
  • Dual valve springs
  • Titanium intake and exhaust valves
  • Multi-angle valve job
  • Valve seats
  • Full length bronze valve guides
  • CNC ported intake and exhaust ports
  • 27" 3-stage coated header
  • Large port billet intake with hardware kit
  • 45mm Carb boot
  • 45mm Mikuni carburetor with velocity stack
  • JRC Billet carb top and lever arm
  • Air filter
  • 3˚ Billet adjustable coil bracket
  • JRC 3HP hot coil
  • JRC billet 3HP flywheel
  • Bosch spark plug
  • Grooved billet starter nut
  • Billet fuel pump bracket
  • Walbro fuel pump
  • 10' of fuel line
  • Fuel filter
  • Billet oil plug
  • Oil drain kit
  • Hardware Kit

  • Specifications:

    Manufacturer's Part Number:

    JR Race Car has an engine for any level of Junior Drag Racing... from the 12.90 Raptor-based motor all the way to Titan 3-3/4" bore motors. Review each engine's specifications to find which one meets your needs. Engine kits also available for Crew Chiefs who like to do their own engines.

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