David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

toolmanmike said

I think he's doing it because he can. Other than time, it costs next to nothing. It will lighten the rod a bit but not really enough to make a horsepower difference. It's like removing casting flash on the block, it's supposed to make the metal stronger but when was the last time you saw a Mopar rod break especially along the middle.

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Interesting take I have not heard before:

David Vizard likes to champher and polish the bottom corner of the cylinder bore to allow air to move more smoothly into the empty cylinder when the piston goes to the top. He was saying there is air going in and out of there on the bottom of that bore.

With that being said I wonder if that top small end of the rod he polished round has anything to do with the air flowing up and over it, creating less drag for the air to move.

Probably more of a race application, but wonder if this actually proves true. High rpm engines like 7000 rpm probably helps.

Thoughts ???



Fun to think about . . .