They may have equivalent torque peaks, but they make them at different places on the curve. The LS7 has a bigger stroke and a smaller bore than the Mark IV 427. You can spin the daylights out of a good Mark IV, plus that new ZL1 block has a lot of room to bore. The LS7 may make more torque at a lower rpm for street manners, but GM says 7000 rpm is the max you should turn it. At least a stocker. The Mark IV will really pull on the top. Depending on what cam, heads & bottom end he uses, he can see and easy 8000 rpm. IMO, the Mark IV has more potential in this situation just because I think he may make more power for the same or less money unless he put a power adder on the LS7.Quote:
Originally Posted by Fuelie Fan
Tommy