OK, Stocker "valve jobs".

[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!

[Billy Nees]

If you know that your spring seat will take the cut without going through or getting too thin/weak then sink the spring seat. I don't know much about 302s but might there be an "offset" retainer (gotta be steel) available? Maybe a combination of both? A shorter spring?

[pmrphil]

Yeah, I agree, the spring should fit the head, not try to make the head fit the spring.

[Henrys Toy]

Originally Posted by 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!

Good morning Jim and to all,
The ideas you have listed will work. You can also find out if your favorite intake or exhaust valve manufacture has valves that are plus .050 and or .100 longer. Then use different assembly height keepers and / or retainers to get to your final height requirement. Have you contacted you valve spring Manufacturer to see if there is some other number valve spring that can accommodate the pressure's you're looking for?
Then you won't have to perform any additional machining processes.
Just a couple of suggestions that might help you, Have a Good Day.

Respectfully,
Henry Kunz 1534 H/SA

[goinbroke2]

Well, I sunk the seat of an intake enough to get 1.90 installed height, that gives me 130# on the seat and 290# over the nose. Still on the high side but livable.

Exhaust I sunk it as far as I like it and only got installed height of 1.805 which is still way to short.

I'm going to start calling around for valves +.100 and see how quick I can get them.


(quite the change from a bracket racing engine build!!)