Oh, and the valve guides are cut to make a little more room for air and reduce air flow friction. The guides protrude into the intake, disrupting the air.
Many will say by cutting/shaving the valve guides you're doing more harm than good. The guide is there to guide the valve in a controlled manner and reduce the slop...
But, it's a big nuisance in there. Now, you can't cut all of it out. But, you can shave it slightly. And, with the heavier springs, it does not hurt you that much.
It might add 5hp, not much.
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