Personally I would leave it, right were it is. Usually advancing the Cam picks up bottom end, seat of the pants and a chance of picking up ET, maybe, but top end usually suffers. Show it’s a trial and error thing. But if it’s a nice street cruiser I doubt your going to notice much of a difference. I mean you can try it at zero and see what you end up with.
Most of the factory cams were on a 114 , so cam company’s knew advancing them along with a little more intake and exhaust duration would definitely make more hp. They also knew the heads was the restriction.
So basically even though they say 109, they Knew with Timeing chain stretch, it’ll end up at 111-112. What their banking on is the opening and closing…change that to much and it’s going to effect cylinder filling.
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Last edited by Gach; 08-07-2022 at 08:05 PM.
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