George Lendich wrote:

George,  A number of people who I respect have suggested that the
optimum shape would be more rectangular.  Making the port wider is only
way to get more volume while at the same time retaining the timing  you
have selected.   I would have done the same except that according to
Rolf's calculations the 1.5 dia. hole  is  adequate up to 8500 rpm.  So
why bother.   I think the round hole will be easy on the seals.    Jerry

Jerry,
You know what - I'm getting the same sort of advice and will try the  same
shape as the exhaust (no wider but maybe a little bigger).
However this will require a fair bit more work and maybe an insert to
accommodate the shape change.

That's why I'm so keen to see your test results and if your results are
good, why go to the extra trouble.

Your right about the round hole being easier on the apex seals!

Here's hoping for the best !!
George (down under)

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