<<  I'm not looking for massive power, I'm looking for a mild street port in a
 > 12A demonstrator to test my aluminum end housings.
 >
 > So you suggest not raising the port IC from stock timing, to keep the
 > duration short and the port wide. I'm a bit conservative and am concerned
 > that too wide a port (especially in the 12A) will cause problems with the
 > apex seal - so I will not go beyond the width of  the exhaust port for that
 > reason.
 >
 > Given my particular situation what IO and IC would you recommend  Lynn
 > George (down under) >>

Give a few days on that. We are off to the races this weekend. I will
assemble a front iron and lay out a Pport with stock side port timing to see what
that looks like. I will take pictures.

The recording of events in crankshaft degrees is the way to go. And once you
get the setup constructed you can lay out ports from all over the world with a
Magic Marker on a stock rotor housing.

The location top of the exhaust and the bottom of the intake ports determine
the overlap period. The less over lap the stronger the low RPM power, and the
better the idle.

If you can get your hands on a nice piece of sheet stock you can make a
perfectly acceptable degree wheel. The 90 and 45 degree marks are easy enough and
C=PiXD (no notation available) divided by 360 gets the size of each degree
spacing.

 Lynn E. Hanover

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