Our 6.4L 392 VVT HEMI Performance MAX EFFORT NA camshaft� is designed for the 6.4 Hemi Owner who wants more power, more torque, and a really nice idle sound!� This camshaft with full bolt on's typically makes +50-65 RWHP over the factory camshaft. This is the largest cam we offer that still works well with both 8HP70 and NAG1 stock torque converters! Our Max Effort Camshaft works well with nitrous shot sizes up to 200. This cam has multiple 392's in the 10 second 1/4 mile range naturally aspirated!!! This camshaft is still daily driver friendly!� For an even more powerful camshaft that does require a higher stall converter, see our updated MMX Max Effort V2 Camshaft. We have found through dyno testing, with an 8 degree phazer limiter installed, this camshaft will only want to be retarted 3-5 degrees past 5500 RPM. Make SURE your tuner is adjusting the VVT camshaft tables for maximum performance! Failure to alter these tables within the tune will result in a major loss in low speed torque and horsepower being left on the table!� Features: HEMI VVT cam grind PN -�MMX-NA6.4ME INT @50-222 EXH @50-23x Lift .614 Intake and Exhaust� LSA 112 You may also choose to get custom tuning for your new MMX camshaft kit here! SPRINGS REQUIRED!Will require a Limiter and custom tuning. Exhaust upgrades such as long tube headers recommended for best results.