IRWINDALE, California — TOYOTA Speedway at Irwindale officials announced today the implementation of a spec racing engine program for its NASCAR Whelen All-American sanctioned ACDelco Super Late Model division. The GM CT525 LS3 Circle Track crate engine has been approved for use for all 2010 Super Late Model races at TOYOTA Speedway at Irwindale including the Super Late Model race run as part of the January 29-30 NASCAR Toyota All-Star Showdown.
Maropulos Racing Engines (MRE) of Simi Valley, CA. MRE has been designated by TOYOTA Speedway at Irwindale as the only approved vendor / supplier to provide a completed spec engine package. The GM LS3 CT525 completed engine from MRE includes engine and approved components (excluding exhaust headers and clutch) and can be purchased for $11,500 plus sales tax.
Competitors may also purchase the GM LS3 CT525 base engine from any approved GM Performance Parts dealer / supplier with MRE supplying and installing the completed package components.
Spec engine specifications and requirements are as follows:
• GM LS3 CT525 6.2L racing engine P/N 19171821. The base engine is rated at 525hp and 471 lb-ft of torque using aluminum block, high-flow LS3 rectangular-port head cylinder heads and includes a carburetor intake manifold and a 6-quart racing oil pan.
• 650 Holley 4bbl carburetor P/N Hly-0-80541-2 (no modifications)
• Ignition controller P/N 19171130 set at 6600 RPM MAX
• Holley electric fuel pump (P/N Hly-12-802-1 must be wired with double relay wiring harness with oil pressure safety switch to ensure fuel pump will shut off when engine is not running.
• Howe header P/N H11209 is the only approved header package for use with this engine
• 4.50 gear rule
• No close ratio transmission may be used to circumvent the gear rule
• Engines may be re-dynoed at MRE at any time to monitor adherence to spec rules
Information on purchasing a new engine and the completed engine package may be obtained by contacting Bill Maropulos Racing Engines, 805-520-4899; 4930 Leeds St., Simi Valley, CA 93063.
Details regarding rules governing the modifications of existing engines used by Super Late Model competitors who are not in a position to immediately upgrade to the CT 525 engine may be obtained by contacting Lester Boyer, TOYOTA Speedway at Irwindale’s director of competition at 626-674-3607.
