Don, It might not make much difference on a street engine. In fact I have
heard from many reputable sources that port matching the exhaust isn't nearly
as critical as port matching the intake. However; If you wan't to spend the
time I doubt it would be detrimental.
Shawn J. Loseke
1972 TR6
Fort Collins, CO
>===== Original Message From Don Malling <dmallin@attglobal.net> =====
>The round tubes on the Falcon Group 44 SS headers are welded to a head
>mounting flange. The head mounting flange has rectangular ports which
>appear to match the exhaust ports in the head. My plan is to port match
>these rectangular flange ports with the head ports.
>
>The question...
>
>I've noticed that the edges of the round pipes infringe on the corners
>of the rectangular flange ports. That is to say, the diameter of the
>pipes is slightly smaller than the diagonal measure of the rectangular
>flange ports. Based on the size/thickness of the weld that attaches the
>pipes to the flange, and which is on the external side of the pipes, it
>would appear that I could safely file away this small portion of the
>round pipe that infringes on the corners of the rectangular flange
>ports. This is a small infringement, but none-the-less, in the very
>corners, the weld material is visible, so I would have filed through the
>thickness of the pipe and would be filing into the weld at that point.
>
>Should I do this or am I worried about nothing? That is, will doing this
> provide any noticeable flow improvement for a street engine? It would
>seem to me that even small obstructions would/could lead to a
>significant amount of turbulence, and that it should be done.
>
>Thanks,
>
>Don Malling
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