That one tickled me a little.
Could actually save time sending it to Safis for welding.
Here is the perspective.
Not sure what you're seeing but looks like some very fuzzy imagination to line that up
For most of us - timing numbers are a mystery.
You make them higher - it get's peakier. ok.
Higher blow down numbers can narrow the power band. Gotcha.
But what transfer numbers should go with what ex. port numbers is less clear.
The BGM came with 123 transfers and 173 exhaust.
Interestingly - the charts would suggest a similar combination.
We moved my transfers up to 124 with exhaust going to 182
Again - that is within the charts match for 8K RPM.
Now we are looking at 126 transfer - chart suggests this would match with 184-186 exhaust timing.
I wasn't so focused on what RPM max power would occur.
Clearly the exhaust has a big say in that.
But the ranges given in the chart for combinations of timings seem to be where we are headed and have been - at least within the ball park.
That's news for some of us.
becoming more clear for me - though it was surprising.
This further proves, as you have seen on yours, the exhaust port size/shape/angles are half the story and the exhaust is the other. Both have to be suited to the purpose to get the desired result.