I do my own valve jobs and I have run a casting number 96 with roller type solid lifter spring pressure needed to get a motor to 6500 rpm cleanly on unleaded fuel for 20K miles without issue .
I made my 30 degree Intake valve seat .065" wide and my Exh seat .080" wide so if your machinist can provide you with those numbers and you use stainless steel valves you will be fine and not need hardened seats installed on the Exh side.
Make sure he does not apply a 3 angle valve job to the Intake , all you need is the stock 30 degree seat and .150" tall 60 degree bottom cut.
On the Exh side to get that .080" wide 45 degree seat you will only beable to get a slight 60 bottom cut in there, and that's fine!
Also have him apply a 30 degree back cut on your Exh valves to give you a remaining .080" wide seat on the valve.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs!
And he was not talking about 1/8 or 1/4 mile ETs!
1) 1940s 100% silver 4 cup tea server set.
Two dry rotted 14 x 10 Micky Thompson slicks.
1) un-mailed in gift coupon from a 1972 box of corn flakes.
Two pairs of brown leather flip flops, never seen more then 2 mph.
Education is what your left with once you forget things!
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