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Next issue on the list was the fact that the LS3 and LSA cams were single-bolt that required a front cover equipped to accept a front cam sensor.

We expected the additional lift offered by the LS3 grind to increase power over the LS2, but that was not the case on this application. LM7The LS6 cam is a favorite among LS enthusiasts, but it seems from this testing that it falls short on the 5.3L compared with the LS2 and LS3 grinds.

The three distinct cam families also required different timing (cam) gears and a management system that allowed such hybrid mixing of crank and cam sensors.

Credit the Holley Dominator EFI system for the ability to accept and tune all of the different cam profiles.

With its new offerings, we were excited about both the Direct-Fit line of cams that require no spring changes and a few of the smaller performance cams with similar duration to the factory options.

We wanted to know how an aftermarket cam of equal (or near-equal) duration compared with the stock stuff. Check out the results to see how your favorite cam compared with the factory LM7.

Such is the effect of extra duration, as the LM7 cam was designed to build torque in the 5.3L.

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