Need clarification on bottom cut

[Moparteacher]

I have just dropped off my heads at the machine shop with instructions on the legal valve job for stock heads, but I suspect I have given the wrong instructions. So I need clarification and proffessional opinion.
Chrysler 383, 906 head.

The updated rules, posted on the NHRA site, state: "In third from last sentence delete “bottom cut may not extend more than .250 inch below seat angle”.

So am I to understand the bottom (throat) cut MAY extend deep into the port, thus removing additional material from the bowl? Legal?

Can I cut at any angle? 75 degrees? 80 degrees? etc. reguardless of the original bottom angle? Legal?

If a 75 or 80 degree throat cut opens the bowl, what happens to this valve job when NHRA comes out with the maximum runner CC's for stock heads?

What about the top cut? How far out can the top cut extend? It wouldn't be hard to utilize the top cut to unshroud the valve. Legal?


Could someone please clarify what exactly is legal and what is not.


Thank You
Gary Weaver