NHRA Rule Change for Valve Grind

[Bob Pagano]

Yes Greg it does say that... But 17 lines above where it says any valve job it says: must retain stock head & stem diameters & stock seat angle.
Looks to me it allows more room below the seat for multi angles or what ever... & it says nothing about what goes on above the seat. No more restrictions about top angles @ +.250 bigger than the valve head diameter. No more picture in section 1:2 of the engine section of the General regs....
It looks to me like I can now do some very nice work above the stock seat, into the chamber, & .250 below the stock seat angle.
Hummmm.. the mind is in overdrive. Just because the rule says I have to put the stock seat angle on the valve.... does it have to touch the stock seat angle in the head?

Adger Smith
on Bobs sign in