<VV> deflashing theory

[BobHelt at aol.com]

When the shock of seeing those partially plugged air passageways in the heads 
wears off, we are usually anxious to OPEN THOSE SLOTS UP. And for good 
reason. More air flowing over those fins does cool better.

But please don't use the "hot-rodders" motto. You know: if some is good, then 
more is better and too much is just right.

Why not? isn't it better to open those passageways up as much as humanly 
possible. Isn't it true, that the more airflow, the better?

Well there is a limit...really. Air passing over those head fins must be in 
contact long enough to remove the heat therein. In other words we want to 
maximize the temperature increase of the air passing over these heads. If the air 
passes too quickly, or there is too much air, then insufficient heat is 
extracted from the heads. So more isn't necessarily better.

So my suggestion would be: remove the flash. That is remove the aluminum that 
isn't supposed to be there. You can see it when you look closely. But please 
don't start hogging out the air passageways and enlarging everything. Also 
don't make openings where there are none. If you will note carefully, the typical 
passageway narrows-down from the fins on top to the center of the head. This 
narrowing is a design feature in my opinion, and not something to be removed.

Regards,
Bob Helt