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In addition to running the stock cams, we also decided to run a handful of aftermarket Crane cams.
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.
Compared with the LS2 and LS3 cams, the LS6 offered less power through most of the rev range, only equaling their outputs at the very top of the rpm band.
Engine Designation: LQ9 (Shared with Late LS1)LQ9 vs.
Such is the effect of extra duration, as the LM7 cam was designed to build torque in the 5.3L.Obviously tuned for low-speed power, torque production with the stock cam exceeded 350 lb-ft from 2,700 rpm to 5,300 rpm.We tested the LR4 and LQ4 cams, but these produced identical power to the LM7. LM7Measured out at 6,500 rpm, the early LS1 cam offered 63 hp over the LM7 cam, but the results illustrate that the gains did not come without a trade-off.In terms of power, the L33 offered additional power over the LM7 cam but did not increase power as much as the LQ9.