OK, Stocker "valve jobs".

[Mark Yacavone]

Originally Posted by Rick J

Is this a "What would you do" type query?

Okay. Along those lines...
The rulebook seems pretty clear...Okay, it's a little murky, but I read that the valve head angle has to remain OEM, as it's always been.
The valve seat used to allow a 3 angle job, I think a quarter inch wide.
Later, when the use of Serdi type machines, using multiple angle cutters became common, NHRA approved the use of them , at any width.

They also allow the cutter to remove material down below the seat angle and along the sides of the combustion chamber, as long as the machining is done off the guide pilot. I don't see where this is specifically allowed in the rules but it's been done for quite a few years now.
In fact, the latter seems to be specifically prohibited by the book.
Talk about confusing... The guy that reads the book and wants to follow it, is probably leaving a lot on the table.

As far as this thread goes, If anyone is using non-stock valve HEAD angles, please let us in on it and when is it was okayed.
Or is it just a case of creative interpretation ?