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Equipped with 1.7 rockers, the LS7 cam increased peak power from 353 hp and 384 lb-ft to 422 hp and 395 lb-ft.Up to 4,500 rpm, the LM7 offered more power, but the LS7 pulled strong all the way to 6,500 rpm. LM7Given the similarity in specs, it is not surprising that the power curve offered by the LS9 mimicked that of the LS7 with 1.7 rockers.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.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.
Engine Designation: LQ9 (Shared with Late LS1) LQ9 vs.Run on the high-mileage 5.3L, the stock 5.3L cam produced peak numbers of 353 hp at 5,200 rpm and 384 lb-ft of torque at 4,300 rpm.It is interesting to note that the same cam was used on the smaller LR4 4.8L, and that combination (same heads, cam, and intake) makes peak power 300 rpm higher.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.