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I called and spoke to a distributor before I made this post with that same question. Operating range is what you need to pay attention to.
You'll probably need a cutter that's operable at a range slightly smaller than your valve head diameter as the actual seat diameter is slightly smaller than your valve. This is also true for the 60 degree as it is even smaller. The 30 degree needs to have an operating range a bit higher as it extends past the valve head diameter.
Not that I'm an expert, this is just off my observations and research.

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I am confused. You said - different cutters needed for intake and exhaust. I assume because of sizes. But if they are adjustable?
Should I look for "Blade adjust" number? If so, it should cover pretty much everything. But if it's "operating range" - then who knows?

They are adjustable but only over a limited range and the 60 less so because of the acute angle.
The 30/45 exhaust cutter covers high 20's to low /mid 30's and the inlet low/mid 30's to low 40's.
The size of the inlet cutter body also interferes with the alloy combustion chamber if sat in the exhaust.
If you could get away with less than the four i would have saved some money and not bought all of them, They aren't cheap.
Next time i'm in the workshop i'll post the part numbers unless Scirocco beats me to it.

 

wrote:

wrote:

 

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I am confused. You said - different cutters needed for intake and exhaust. I assume because of sizes. But if they are adjustable?
Should I look for "Blade adjust" number? If so, it should cover pretty much everything. But if it's "operating range" - then who knows?

They are adjustable but only over a limited range and the 60 less so because of the acute angle.
The exhaust cutter covers high 20's to low /mid 30's and the inlet low/mid 30's to low 40's.
The size of the inlet cutter body also interferes with the alloy combustion chamber if sat in the exhaust.
If you could get away with less than the four i would have saved some money and not bought all of them, They aren't cheap.
Next time i'm in the workshop i'll post the part numbers unless Scirroco beats me to it.


 

Yes, I was hoping 2 will do. If not - I am not sure it's worth it for one job. Mine as well find a good shop..

In my Set i have following cutters
NEWAY No. 230 = 30/45 degree exhaust
NEWAY No. 234 = 30/45 degree intake
NEWAY No. 205 = 60 degree exhaust and intake

Will post pics with min/max diameter later, so stay tuned..

 

The 205 cutter works for exhaust also?
Neway says the operating minimum is 35mm.

Appreciate the info!

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The 205 cutter works for exhaust also?
Neway says the operating minimum is 35mm.

Appreciate the info!

I would say operating minimum is 25 mm. Can pics lie???

  

I suppose not! You'd know better than I would, just wanted to confirm. 
I'm probably misunderstanding the verbiage.
for reference here's heres what I was looking at:
 

With a cutter like shown you can extend the blades down a little below the cone end of the body and get down to 32mm or so.  I wouldn't go smaller though.