Stocker Cylinder Heads....

[Bill Diehl]

Bump, this is 2 years old now.....so how far down with the cutter can we go? on both ends of the job?

Are they going by looks, feelings, a measurement or who you are?

[Alan Roehrich]

Originally Posted by Bill Diehl

Bump, this is 2 years old now.....so how far down with the cutter can we go? on both ends of the job?

Are they going by looks, feelings, a measurement or who you are?

Ask your division tech people.

[Bill Diehl]

Originally Posted by Alan Roehrich

Ask your division tech people.

It is Indy that I am concerned with

[Adger Smith]

Bill, I have been told that as long as it swings around the guide C/L it will pass.
There seems to be no depth numbers any more. Let me qualify the above statement with "AS OF" July 2014. Rules can be a moving target you better call someone with a little more authority than this message board.

[james schaechter]

Originally Posted by Bill Diehl

It is Indy that I am concerned with

Good call. Come out of nowhere and be fast at Indy. That is cool,but it is a lock for getting invited to the dance. Seen it many times. Most of the time it works out. Most of the time....

[jmantle]

Originally Posted by Adger Smith

Bill, I have been told that as long as it swings around the guide C/L it will pass.
There seems to be no depth numbers any more. Let me qualify the above statement with "AS OF" July 2014. Rules can be a moving target you better call someone with a little more authority than this message board.

This is my understanding of the rule. As there is nothing in the rulebook saying you can't cut the manifold face in stock, if the bottom cut takes you over the maximum cc's, it's not hard to fix. I had suggested NHRA add something in the rulebook about not cutting the manifold faces but was shot down on that one. It would be interesting to know how many of the "expensive" heads have had the faces cut.

Jim Mantle V/SA 6632

[Bill Diehl]

Originally Posted by jmantle

This is my understanding of the rule. As there is nothing in the rulebook saying you can't cut the manifold face in stock, if the bottom cut takes you over the maximum cc's, it's not hard to fix. I had suggested NHRA add something in the rulebook about not cutting the manifold faces but was shot down on that one. It would be interesting to know how many of the "expensive" heads have had the faces cut.

Jim Mantle V/SA 6632

can't cut past the valve cover bolt holes the way I read it

[Adger Smith]

Bill, if it has had any angle milling at all the face needs to be milled to get the angle corrected. Even flat milling the head the intake surface needs milling for the intake to fit in the valley. I would say the odds are pretty good that there are very few that haven't had the intake surface milled.

[Lou Jeffery]

The basics of Fast stocker cylinder heads are very simple. If you consider each intake port and exhaust port assembly as a orifice you can flow them with a constant draw and establish an effective orifice size. There are endless ways to change or improve flow. The only way to significantly improve flow is to change the effective orifice size of the assembly by porting!
Stop lying to yourselves and Stop pushing NHRA to police something that is out of control. If NHRA were to throw out ALL modified stocker heads the pits would be empty. I know I know it's only the other guys that would stoop to cheating NOT YOU!
Just buy the $1000 cast iron intake and the $3500 heads and have fun like MANY others do. Louis Jeffery

[dennis dunlap]

All this just reminds me of the letter I got from nhra several years ago after being pitched out.... after further review ect ect... what's right?????? Sounds like my x_ wife...... I'm done thanks