Just curious, do they go up to 1.60 exhaust valves to bring the seat height back up? I imagine if they’re using some of the value priced 5/16 stem Chevy 305 valves they’re getting really good bang for the buck.
I believe @perfacar raced 273's and I think he would know. I'm not sure you would need the 1.60 exhaust valve. I'm just getting back into research, but I am looking at 5/16 or 8mm valves for cheap, light, and quality alternatives for valves. The +.100 Magnum valves look interesting. I always used Chrysler or aftermarket stainless steel valves with 3/8 stems, but that was a long time ago.
