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The LS2 also required a front cam sensor (no provision on the cam for rear sensor), but the LS1 and all other (early) three-bolt cams required a rear sensor.
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.
In this ultimate LS cam comparo, we’ve answered that question, and others like: How much is an LS1 cam worth over the 5.3L? Is there any difference between the LR4, early LQ4, and LM7? The spring issue was easily cured using a beehive upgrade.
Despite a jump of 14 degrees in intake duration over the LM7 cam, the LS2 offered more than 21 inches of vacuum and lost out to the smaller cam only below 3,000 rpm. LM7Despite similar specs to the LS2 (increased intake lift), low-speed power production with the LS3 cam was down compared with the LS2.
This was evident from the fact that the LM7 offered more torque up to 4,200 rpm.
As expected, the LS3 offered plenty of power, producing 405 hp and 398 lb-ft of torque.
This represented a peak gain of 91 hp over the LM7 at 6,500 rpm.
Though the L33 offered more power than the mild LM7, it’s hardly worth the effort. 5.3L)With the highest lift and longest duration of any factory cam, it was not surprising that the LS7 offered the greatest power gains.
Grab one of the hotter factory (or Crane) cams if you are going to upgrade. Since the LS7 was designed to be run with 1.8 rockers, we ran the cam both ways.LM7Though it did not offer the top-end charge of the LS2-LS6 grinds, the (late) LQ9 cam offered impressive power gains over the LM7 and would be a good upgrade for a 5.3L truck owner or someone looking to improve performance without sacrificing low-speed torque production.The slight loss of 8 lb-ft was more than offset by the 40 extra horsepower at the top.It’s important to note that the power gains offered here would likely be magnified had we tested the cams on a larger 6.0L. LM7Contrary to popular belief, the L33 cam is not the same as the LQ9 grind.The L33 was essentially a high-lift version of the LM7 with a few extra degrees of duration.The LM7 cam offered more low-speed torque (by as much as 22 lb-ft) up to 4,400 rpm, but the LS1 cam pulled away there after.