Re: OK, Stocker "valve jobs".
Well aware of BBC angel a cant of the valves. Spent a ton of money on a 68 427/ 400 project with 290 small plug heads. The car we got was from Wayne Shaw was a 69 350/ 350 car. I sold to John Livingston and he made the Tennessee Thunder car. NHRA made him change doors and put the key on the dash.
We enlarged the hole with an end mill to keep the tap drill from following the path of least resistance. And then spot faced the seat of the screw in stud.
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