NASCAR-Approved Spec Engine

The NASCAR-Approved Spec Engine is an alternative for competitors in the NASCAR K&N Pro Series, NASCAR Whelen Modified Tour, NASCAR Whelen Southern Modified Tour, and NASCAR Canadian Tire Series. It is also an option for the NASCAR Camping World Truck Series at select tracks.

During the 2012 season over 350 Spec engines ran in competition across all the series and tours. Combined they produced 36 victories, 207  top-five finishes and 362 top ten finishes; with teams reporting an average annual cost savings of between 30-40% when compared to buying, maintaining and running “built” engine options.  

The foundation of the NASCAR-Approved Spec Engine is a production GM LS2 block (6.0L / 4.000) with LS2 CNC ported heads. Fully assembled the 364 cubic inch engine weighs around 415 pounds and produces approximately 610hp and 500 ft-lbs of torque. It’s components come from many of the best aftermarket companies including:

  • Edelbrock manifold and fuel pump
  • JE Pistons
  • Lunati crank (3.622 stroke) and rods
  • Comp Cams camshaft
  • Holley carburetor
  • Quartermaster clutch, starter and bellhousing
  • MSD distributors
  • Clevite bearings
  • Cometic gaskets
  • Kooks headers
  • etc…

The Spec Engine is not a “sealed” engine and NASCAR rules do allow teams to assemble, disassemble and rebuild the Spec Engine but no modifications to the components are allowed other than what is stated in the current rule books.