Thanks to Knukkel
I was able to borrow a knucklehead engine for a while!
I will take it apart, measure and model all the parts in CAD,
and then put it back together again...
week the knuckle cylinder head had 132 features, this week I
added 124 features and completed the cast iron part.
The reason I am showing this is to make the point that there
is no quick and easy way of doing this, it is mostly a matter
of determination really... On the positive side, mirroring the
front cylinder head to make the rear head took less than a minute.
I will have to check the angle of the rear exhaust port though,
because sometimes the exhaust flanges are not angled the same
front and rear.