that's because when the glue it the foam parts touch a " glue plate " that come up out a hot bath of wax and touches off on the foam
part and the assembled to its mate for cooling . timing and...
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that's because when the glue it the foam parts touch a " glue plate " that come up out a hot bath of wax and touches off on the foam
part and the assembled to its mate for cooling . timing and...
When the block was made it was first pieces of foam they " glue " the foam together using wax.
during that process they do not try to remove the excess wax and because of that this is what you see...
I believe I still have the port angle gauges I used when porting this engine while working for the OMC race group years ago . i do not remember the exhaust port beging oval like that ? when I did it...