Speedmaster heads are on and running.....

oldkimmer said

So u must think by ur butt Dyno their was a marked improvement of a 1/2 second. That will be great if it is. Kim

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My seat-of-the-pants dyno says "Hands down, No doubt faster". I also have markings out of town and I gained MPH in that same stretch compared to before. I would guess 4 tenths, but that's just my guess. That would be a 12.9