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Posted by murka 897 days ago (http://www.hotrod.com)
GM LS Engine Cam Test - Four-Way Bumpstick BlowoutWe test Comp Cams' five best-selling camshafts for late model GM engines and see how they compareWith free-flowing heads and high-ratio rockers stock, General Motors' LS engine series (and by LS we also include the LQ9, L99, and L92) just cries out for dual-pattern cams with quick-opening-and-closing, high-lift lobes. These engines are not your father's small-block. The Generation III and IV small-block family has been out more than 10 years now and continues to evolve, so there are lots of variations. Currently, LS engines in wide use by hot rodders range from 5.3 liters (327 ci) through 6.2 liters (364 ci). And for the Daddy Warbucks crowd, aftermarket blocks and heads are available that make it possible to build near-500ci, LS-based engines. Meanwhile, the old cathedral-shaped intake-port heads are being superseded in performance applications by new, big-block-sized rectangular-port heads. Add in the different characteristics of EFI versus carburetion, and cam selection becomes trickier. When HOT ROD decided it was time to test Comp Cams' best-selling LS cam grinds, we had to make some decisions or we'd be running the dyno for a year. Photo Gallery: GM LS Engine Cam Test - Comp Cams Gen III/IV Camshaft Shootout - Hot Rod Magazine Photo Gallery: GM LS Engine Cam Test - Comp Cams Gen III/IV Camshaft Shootout - Hot Rod MagazineRead More |
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