Re: OK, Stocker "valve jobs".
 

SBC is 23 degree, SBF is 20 degree, etc.
What's BBC, 24 and 4, I believe, on the intake side.

Re: OK, Stocker "valve jobs".
 

Phil, So you believe that the stock valve angle + or - means you can't re-bore the valve guide hole at a different angle, face off the spring seat to match, change the the valve job sealing angle or possibly install new seats ,at the new angle, and then possibly modify the combustion chamber, which is already illegal? How much could you actually move the valve angle in the head and get away with it? Remember , the approved Stock replacement pistons have to have the valve reliefs at the original angle and depth.
Okay then , if that's what it now means. But it's not what it used to mean, and I go back over 50 years with S/SS tear downs. ;-)

Re: OK, Stocker "valve jobs".
 

Ya know, NHRA is notorious for being very vague and sometimes misleading with the wording of some of it's rules. That IS intentional. Many times I have contacted Tech Inspectors for clarifications and TWICE by TWO different Inspectors I've been told "we don't want you to ask for permission, we want you to beg for forgiveness!"
I will hope that the "any valve job" means what it says and I won't be throwing out a very good set of heads.
OBTW, talking about "valve (stem) angles, have you ever checked a set of SB heads after they've been cut .120 or more?

Re: OK, Stocker "valve jobs".
 

Correct Mark, they do give you a plus or minus ONE degree
Angle milled .120 would be just shy of a degree and a half, so, yes, technically illegal, but only if they actually know how to measure

Re: OK, Stocker "valve jobs".
 

Wouldn't angle milling the deck surface of the heads be a lot less work to basically accomplish the same goal?

Re: OK, Stocker "valve jobs".
 

That's what Billy was talking about

Re: OK, Stocker "valve jobs".
 

Question here, for anyone.
How would tech check the valve incline angle during a tear down, on a canted valve type engine....or any engine , for that matter ?
I don't know, and I've never seen it done.

Re: OK, Stocker "valve jobs".
 

Is it better to do the valve job before or after you port the heads?

Re: OK, Stocker "valve jobs".
 

That right there is some funny... um uh... excrement...
LOL

Re: OK, Stocker "valve jobs".
 

Level the head with deck surface up, and use an angle finder on the face of the valve. Similar to checking "things" out on a floating head type of seat and guide machine. Canted valve check would be the same process.