The LS6 cam is a favorite among LS enthusiasts, but it seems from this testing that it falls short on the 5. Such is the effect of extra duration, as the LM7 cam was designed to build torque in the 5. 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. My buddy, Joe, just bought a new cam for his 6. As expected, the LS3 offered plenty of power, producing hp and lb-ft of torque.
The result is a guide that will help you select the best OE GM cam for your 5.
ls magazine GIFs
While we were on factory cams, we decided that in addition to the peak power gains, it would be interesting to document things like idle vacuum, cranking compression, and average power and torque gains lower in the rev range. Contrary to popular belief, the L33 cam is not the same as the LQ9 grind. The LS1 cam would certainly offer additional performance if you kept the revs above 4, rpm, but know that below that point there was a torque loss. Here is a common question among LS engine enthusiasts: In terms of power, the L33 offered additional power over the LM7 cam but did not increase power as much as the LQ9.