Bigbore500r
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My 07 halfton vmax had more horsepower than the same year 2500 gas chevy truck..... so this is not true!
Allow me to geek out for second Brian. I've towed my boat behind your old NNBS Vortec Max 1500, and with my current NBS 2500HD. Whats interesting is that my '07 2500 with the LQ4 (less HP / TQ) than your Vortec Max NNBS, pulls way harder.
The reason is that the L92 heads your motor came equipped with are huge, and make big power upstairs. But we don't tow above 4000rpm (i dont anyway) and it isn't until 4000rpm that those heads match or exceed the cathedral port 317 head equipped motor's power. Below that the old LQ4 is holding a higher torque curve. The newer DI motors (both 5.3 and 6.2 models) actually have smaller ports than the L92 headed motors. They've figured out how to keep flow up with less runner volume, which boosts low end torque. Combine that with the over 11:1 compression ratio the DI motors run, and they are torque monsters compared to the 07-14 generation 6.0's