For big-horsepower versions of GM's vaunted LS engine, builders discovered using a camshaft with an unconventional firing order is one of the best ways to subdue excessive harmonics at higher rpm ...

There are alternative firing orders, including the 4/7 swap, but none of them get rid of having two pairs of adjacent cylinders firing in succession, pulling an intake charge from the same corner ...

There are alternative firing orders, including the 4/7 swap, but none of them get rid of having two pairs of adjacent cylinders firing in succession, pulling an intake charge from the same corner ...