3/10/2024 0 Comments Ls3 vs lq9What really sealed the deal on the LY6 was the use of LS3-style rectangular port heads. The 2007-up LY6 6.0L featured the Gen IV upgrades to the block and connecting rods, along with slightly higher compression (9.6:1 vs. What we had our eye on was a Gen IV LY6, and the reasons for this choice were numerous. The LQ9 was basically an LQ4 with flat-top pistons and was rated at 345 hp and (oddly enough) an LQ4-matching 380 lb-ft of torque. One step up from the LQ4 was the higher-compression LQ9. Depending on the application, the LQ4 was rated between 300-325 hp and 360-380 lb-ft of torque. Used as the base 6.0L, the LQ4 featured dished pistons, a mild cam (very mild in 1999-'00) and the 317 (cathedral port) heads. Originally equipped with iron LS heads (yep, that's right), the LQ4 was quickly upgraded to aluminum 317 heads in 2000. Once we decided on a 6.0L we needed to hone in on the specific version, as GM offered a variety of different 6.0L combinations over the years.
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