Those are better photos. I can see the problem now. Get your cylinder head bloke to check his seating width on the inserts too. If they are cut too narrow it can cause this as it doesn't allow sufficient surface area contact to dissipate the heat from the valve head. ? ?  Might be an idea to open the valve clearance a little wider too.  Allow the valve a bit longer on its seat. 

Me too!
Supertech 1mm oversize valves have been ordered

I disagree. Yes there are two people who have used the standard valves to produce great horsepower figures but there is more to it than just a big horsepower figure for car which spend a lot of there time being flogged every time they are started.
What are saying is every racecar should change to OEM valves as these are better? I changed by recommendation from someone who has building race engines for endurance racing/rally blah blah blah for 30 years. If OEM was the correct valves, everyone would be using these. They are not as OEM will fail long before a good quality valve which is specifically made for an operating range outside of street applications.
The same goes for valve sizing. Even if there is a minimal gain, it is still a gain but most important is you can run less boost, less heat, less stress, better spooling which is critical in circuit racing.  
I do not understand how this is even being debated?  
 

B24
I disagree. Yes there are two people who have used the standard valves to produce great horsepower figures but there is more to it than just a big horsepower figure for car which spend a lot of there time being flogged every time they are started.
What are saying is every racecar should change to OEM valves as these are better? I changed by recommendation from someone who has building race engines for endurance racing/rally blah blah blah for 30 years. If OEM was the correct valves, everyone would be using these. They are not as OEM will fail long before a good quality valve which is specifically made for an operating range outside of street applications.
The same goes for valve sizing. Even if there is a minimal gain, it is still a gain but most important is you can run less boost, less heat, less stress, better spooling which is critical in circuit racing.  
I do not understand how this is even being debated?  
 

I will start by agreeing 100% that changing valves to that of suitable materials for prolonged heat generated in motorsport use, where OE valves will not cope and burn out more frequently.
 
As for the use of oversized valves in a multi valve engine for sprint racing, like you both compete in i will diagree massively. removing material, for a larger valve, therefore putting valve seats closer together which leaves less of a heatsoak area for the valve to transfer heat to the head does not make sense. In a drag race motor, where every last hp is needed for a short burst, sure there is a gain. In a time attack engine where you will do 2 hot laps tops with a cooldown in between, and really need an engine to survive 5 minutes flat out, yes an oversize valve makes sense when a budget allows. In an older design 2 valve per cylinder engine where there is still ample material left in the head to allow adequate quenching of valve temps, yes and justifiable for the gains. In an engine doing lap after lap?? where temps get really hot, and stress components unbelievably?? Not unless you have the play money and are going for every last tenth to win a championship. Your priority is on reliability, so an expensive exercise for a tiny gain, does not make a value or sound choice.
 
Don't get me wrong, if that is the recommendation your engine builder has given you, if i was in your position, i would have also followed it. In the case of the engine builders i have dealt with, running oversized valves is one of the last things they would recommend, particularily in the application both bud and yourself use them for.

1mm + valves just because?

Why arnt we running endless valve lift too?

Why are we only running 2.2l and not 2.4l?

Probably because there is a reason to change some things and leave others alone.....

Agree with the above ^

Without a back to back change of only the valve size we wont know.....

Bigger isnt always better.

2.2l should be making far more power than you are right?

Steve, do you know anyone that's had standard valves fail? Street car or race car? Standard valve equiped, modified 3SGTE's have participated in various forms of motorsport around the world & to my knowledge, valves have not proven to be a weakness. My motor's spun on numerous occassions to near 9000rpm. It's not a racecar, but has seen rpm that not many here have.
 
I'm not a fan of change for the sake of change. I agree that if done right (ie not dodgy ferrea's), no harm in 1mm oversize & a small power gain. If anyone here takes apart their head, fits 1mm oversize valves & makes an additional 7rwkw (10 odd hp - equivalent to traditional 1psi gain) with no other changes (timing advance, boost, AFR etc), I'll buy you a case of beer.
 
In no way, shape or form did I recommend anyone or Bud revert back. Simply stating for any readers that the small gain may not be worth the hassle/risk.