well its good to see some people still have the willingness to try there hand at the old ways.

its a good vid, and your heading down the right path

but may I ask, what cam, and spring pressures you are going to run on these valves?

since thes are stock cast valves and you went up the stem , what world concern me is the scoring around the stem area,
the swril polish you did should help off set this, but now with the score marks around the stem , the head it more liable to "pop" off.
just the same way you cut glass by scoring it, then snapping it, you have probly done the same thing to your valves.

yes they did this back in the 60's, and got away, but the spring tentions were about 80lbs closed and 180 open in most apps. and not on the hard seats that the alum LT1 heads have. Back then the lead additive help pad the valve to seat contact so the exhaust seats did not pound out.
also your spring tentions should be about 90lbs closed and around 240-260 open,(due to the fact it is a roller cam with faster ramp rates than an old flat tappet cam, then shutting on the powdered/sintial seat material, so think of the harmonics and vibration.

I would not have this concern, if you would have just done the lip and stayed within about .125 under the lip

now have you weight matched and balanced the valves within 1g? if not now they will not act as a matched set, BTW check your springs and see how they are too.

http://forums.corvetteforum.com/engi...e-springs.html

there are 3 diffrent springs used on the LT1, this is based on the info I have, depending on what year it is, 92-95 95-97 and corvette w/ auto trans 1996

92-95 is 88lbs@1.700
95-97 is 80lbs@1.00
and the '96 auto trans 85lbs@1.780


But I do agree with getting that lip away for improved air flow...
http://forums.corvetteforum.com/engi...post1573201352

personally, I would hit ebay and get a set of the Engbldr stainless steel valves for about $100 and back cut them and call it good.

and as the others before me said, have the valve face ground (if you still intend to use them) and lap them in.
http://forums.corvetteforum.com/engi...p-a-valve.html
but for what little you will have gained, will be lost if you do not have a good 3 angle , or beter yet a 5 angle valve job done

I wish you the best of luck with your build up!!

also, back cutting is good for about 2-3 cfm of flow, thats what I have noticed on my flowbench.

 

Thanks for the input fellas, definitely some food for thought