OK, Stocker "valve jobs".

[Larry Hill]

If you angel mill the head enough to change valve angle more than 1 degree in relation to the deck of the block deck, would you have to relocate valves guides to the 23 degree + or - 1degree to be legal in a SBC ?

[Billy Nees]

Originally Posted by Larry Hill

If you angel mill the head enough to change valve angle more than 1 degree in relation to the deck of the block deck, would you have to relocate valves guides to the 23 degree + or - 1degree to be legal in a SBC ?

Well, I guess the "proper" way to do it would be to not angle mill the head enough to get into that situation. On occasion, I have angle and flat milled a SB head to get what I need.

[Jeff Stout]

Will any motor benefit from a 1 or 2 degree valve angle change?
I assume you could angle mill head and install guide and seats at a angle to get as much as possible.

[Mark Yacavone]

Originally Posted by pmrphil

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.

Thanks, Phil
With all due respect, I knew how to go about it on a Serdi or similar table.
So, in a few words, it's never gonna happen at an NHRA tear down...
Yet, if this is what this phrase means, here it is,..almost right at the top of the cylinder head paragraph.


BTW where is this spec available for various oddball engines?

[pmrphil]

It would be fun to watch them with a bubble level - "hey, it's almost touching the line, is that a thousandth?"

[Larry Hill]

Always remember to level the level.

[Adger Smith]

If My memory is working I believe about 1 degree on a SBC head was .125 angle mill.
I havent looked at the rules in quite a few years and the one thing we used to do that is pretty clear we can't do anymore is pour the heat riser passage completely full of melted aluminum and shape the Ex. valve pocket.

Will a top angle with an outside radius that gets into the chanber wall be considered illegal as a "Chamber Modification? It Could be considered "Unshrouding"

[Billy Nees]

Originally Posted by Adger Smith

Will a top angle with an outside radius that gets into the chanber wall be considered illegal as a "Chamber Modification? It Could be considered "Unshrouding"

Hi Adger, well I guess that it COULD be couldn't it? I guess it would all depend on who's interpreting the rules on that day.

[pmrphil]

I've been doing a +.250 over valve diameter top cut for years. Does wonders for airflow with a BBC

[goinbroke2]

Since all the head guys are here, ill ask here?.

How do you raise installed height? Never had this problem before, i have lock/retainers that raise it up but not enough.
1) Sink the valve deeper, but that lowers compression
2) mill the spring seat down

I need around .100 on intake and .140 more on exh, thoughts?

Oh, and the reason i need more height is because my spring pressures are too high. (70-80# too high)

Or am i looking at it wrong???

Not too proud to admit i dont know much!