shane_3800
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How are you going to bore a curve?
Only way to overcome the restriction is force it.
Like I said either make a tool that grips emery paper with a flex shaft stolen from a cable like a brake cable.
Or use a flex cable and bore it with 50mm cross buffs.
You would only need to bore the curve and die grind the rest.
There's one runner under the coolant crossover so the will need to be cut out and rewelded but that is hidden.
Also number 8 is quite blocked in so you would increase the plenum area to assist in flow to the entry.