Late Model Stock Valvetrain - Maximum Effort Valvetrain

Late Model Stock Valvetrain - Maximum Effort Valvetrain

Jeff Huneycutt takes a look at one of the hardest working valvetrains in motorsports—the Late Model Stock—and the tricks some engine builders are taking to push it to its limits

In circle track racing the Late Model Stock classes have a now-classic set of rules that mostly hasn’t changed in more than a dozen years. The heads must come from the manufacturer, typically the Chevrolet Bow Tie 23-degree and Ford N351, and must be iron with no port work besides a three-angle valve job. Valves must be steel and the stock size. The cam has to be a flat tappet solid, the carburetor is a restrictive two-barrel (usually either 350 or 500 cfm), and the intake is an aluminum dual-plane stock-style intake that legally, you aren’t allowed to do anything to beyond dust it off and bolt it up.

Photo Gallery: Late Model Stock Valvetrain - How To Get The Most Out Of Your Valvetrain - Circle Track Magazine

Photo Gallery: Late Model Stock Valvetrain - How To Get The Most Out Of Your Valvetrain - Circle Track Magazine

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Source: http://www.circletrack.com/enginetech/ctrp_1107_late_model_stock_valvetrain/index.html

James Haydon Dirk Heidolf Franz Heller John Hempleman