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Mike you are talking like a carpenter with your 1/8" and 1/4" figures. If you chamfered the ports 1/8" the engine would be ruined, and the block would be ready for the scrap pile. The best efective port modifications would be somewhere in the .020" to .060" so if the ports were chamfered .020" this would be a signifigant modification and increase in performance. Some factory race engines had ramp ports which is the same thing as chamfering (port were raised on a angular cut) and the engines performed great. It doesn't matter whether it's 90 degrees or 45 degrees the fuel air mixture doesn't know the differene, all that matters the point where the port opens.
Another thing, some engines respond better to ports cut as you described, raised more in the center and tapering down on the sides, so don't think that can't be an advantage, it can.
I've spent endless hours doing port modifications, on HotRods and Mercury and other engines, and have talked to a lot of people that do them, and sometimes a little is better than a lot on port work.
Maybe the Chief inspector should write a paper or do a seminar for the Commision to educate them on performances advantages and how they can be gained in areas like this.
Mike, I'm sure Vicki will pick an nice HOT PINK color for the new boat
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Another thing, some engines respond better to ports cut as you described, raised more in the center and tapering down on the sides, so don't think that can't be an advantage, it can.
I've spent endless hours doing port modifications, on HotRods and Mercury and other engines, and have talked to a lot of people that do them, and sometimes a little is better than a lot on port work.
Maybe the Chief inspector should write a paper or do a seminar for the Commision to educate them on performances advantages and how they can be gained in areas like this.
Mike, I'm sure Vicki will pick an nice HOT PINK color for the new boat
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