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JR Race Car ZR4 Engine Kit 3-3/4" Bore

JR Race Car ZRK-8000


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Estimated to ship directly from the manufacturer on 07/25/18
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JR Race Car 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.

    Some parts are not legal for use in California or other states with similar laws / regulations