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HomeNew ProductsMercury Racing Showcasing Four-Valve Heads on LS Crate Engine at SEMA Show

Mercury Racing Showcasing Four-Valve Heads on LS Crate Engine at SEMA Show


Earlier today, high-performance marine engine leader Mercury Racing unveiled a concept small block four-valve automotive crate engine at the Specialty Equipment Market Association (SEMA) show in Las Vegas. According to a press release from the Fond Du Lac, Wis., company, the engine features dual overhead cam shaft (DOHC) four-valve cylinder heads modeled after those used on Mercury Racing’s exclusive quad-cam, four-valve (QC4v) engine platform. Designed to integrate with existing General Motors LS series engine hardware, the unique heads provide a proven high-performance valve train for the robust small block engine design, according to the release.

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For additional views of the new concept LS small-block with Mercury Racing’s four-valve cylinder heads, check out the slideshow above.

“With such positive feedback regarding our exclusive QC4v engine platform and its robust valve train, we felt compelled to explore the adaptation of the four valve DOHC head to General Motor’s popular LS small block V-8,” Rick Mackie of Mercury Racing wrote in his most recent blog. “We are anxious to get input regarding our unique small block four valve motor.”

The four-valve design provides improved intake and exhaust flows when compared to conventional two-valve heads, according to Mercury Racing’s engineers. Enhanced port flow enables the engine design to increase maximum power or maintain current power with milder camshaft timings. Valve train durability is also much greater compared to two-valve designs due to reduced mass and, thus, lower stresses.

This is Mercury Racing’s second trip to SEMA. The QC4v automotive crate engine, which was unveiled at SEMA in 2013 and earned a SEMA Global Media Award, will also be featured at the show. The company offers 1,100-, 1,350- and 1,650-hp turbocharged engines based on its QC4v platform.