It’s a buddy from work, so I’d have to confirm. He’s a big block Chevy guy and 454 intakes are 2.19, so at least. Probably 11/32 guide for the cutter, but hoping he has a 3/8th.
I’ve see where people make a fly cutter out of an old valve, and I have plenty of stock 906 valves, but the are smaller than what’s in the stealth heads.
