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 2010 season over 300 engines ran in competition. Combined they produced 23 victories, 120 top-five finishes and 229 top ten finishes; with teams reporting an average annual cost savings of $70,000 – $80,000 when compared to running “built” engines.
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 600hp and 495 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.
