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When do you need to do it, or when should you do it?

I always chamfer the top of the block if it protrudes into the combustion chamber around the valves.

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When did you do it? What valve size and lift is he generally accepted threshold?

Current plan is 2.14/1.81 valves and .500" lift (figured with a 1.5 rocker ) and about 300 duration. ( I'd have to pull the card)

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When did you do it? What valve size and lift is he generally accepted threshold?

Current plan is 2.14/1.81 valves and .500" lift (figured with a 1.5 rocker ) and about 300 duration. ( I'd have to pull the card)

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There's a much easier solution, unless it's a resto type build. (Use a 400 block)

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383 short block that needs no machining or a 400 that needs everything - Ive put the 400 up for sale. If I were to use it it would be a 451 stroker - since I have those parts and the machining wouldnt be alot different than a stock 400.
Likely never get to that. Ive had it ten years. I have two really nice low use 383s - no ridge and clean cranks.