Depending on your budget, finding an affordable upgrade for your mill can be challenging and even a bit disappointing. That's not to say we all don't want to tear a motor down and start from scratch ...

Can roller rocker arms actually help add horsepower? The mechanically savvy will likely consider that question and say: “If you have more lift, and open the valves more, then you’ll make more power.

The rocker arm employs the use of a fulcrum or pivot to increase the cam lift by a given ratio. That increase in lift is the result of moving the pushrod pivot point closer to the fulcrum. That ...