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

[div 5]

Got the 48th edition of ND today and it has the picture that is missing from the 2008 rulebook. The way I read it the .250 measurement is taken from bottom of the seat cut but the picture shows it taken from the top. I'm following Bob's advice and waiting before I start my next set of heads.

[ss wannabee]

I agree with Adger......too many rules changes including major ones like this one in too short a period of time. But I guess it goes with the territory this fast-paced world we're in....Internet and all.......One has to wonder though if the entire national NHRA tech staff is being versed as well on these changes. I say leave the rules changes alone and LET'S JUST RACE!