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RRC 70mm port matching

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51
Hi guys,
I've just bought a new RRC manifold and a Hybrid Racing 70mm throttle body. I've taken both to a machine shop to bore out the manifold, however they have only gone about 30mm in because they were worried about going through the casting. This is fine but it has left a large Step that will cause turbulence, is it safe to just go straight through 70mm wide?
 
It's been done before yes. I was going to get mine done.

If they go too far they will go into the channels, but as long as they match the TB bore and taper into the plenum, they'll be fine.
 
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