Well, I would love to do a cam, but I havent been able to find a good valve spring. All of the briggs springs are to large or too long, so it looks like we are stuck with the springs that we have. But if I could find a good spring replacement you could get away with easily increasing lift by .075. without doing any modification which would give a significant gain. But the next problem like the briggs engine is breaking the lifter bores, they look like you would need to weld them to make them stronger. And I am not going to start welding the block. If the stock cam will give me good power to the 5500 rpm range I will be happy. If not then I will try to have a mild cam regrind.