superstock hemi heads

SSDA Hemi · 11-22-2012, 06:33 PM

Part of the problem is the intake face on a Hemi is not at a 90 degree angle to the valve cover surface so the threads of the valve cover bolt breaks through at the bottom of the threads before you are close at the valve cover .

A simple wording of "valve cover bolt hole at the valve cover rail" would in fact keep a majority of the heads legal, BUT- why should some heads be exempt and some be outlawed?

All the heads have gone through tech. Legal yesterday but not today. The heads that are milled into the bolt at the rail need a spacer greater than what is milled to be legal and port volumes adjusted to correct cc's. No new Heads
can be built this way. Old heads grandfathered in.

Like Eric Jones stated " a few thousandths one way or the other isn't going to kill the head"

Hemi Moose · 11-23-2012, 07:10 PM

Are there any plans for the parties involved to sit down with NHRA and have a pow-wow, because this can't go on it will only hurt the class the drivers & owners involved and especially the fans!!!

SPS · 11-24-2012, 09:12 AM

I really don't know why anybody would argue this with Charlie. He likely knows and has seen more of whats going on than anybody.

Besides, as he said, this rule has been in the book and accepted for ever. A lot older than 1991.

It also affects all other engines (Chevys for sure) too.

As Charlie said, "where do you stop milling??" at the valve guide??

The cylinder head guys (the majority) have honoured this rule to date, so it is what it is.

FJ

SSDA Hemi · 11-24-2012, 05:02 PM

FJ, that is why the first call I made regarding this subject was to confirm that NHRA told John Gulius this was not allowed on a sbc…

Intake side of head may not be cut into ANY PART of valve cover bolt holes

Maybe "Any" means valve cover rail…(sarcasm)

I hope I'm wrong as I'll have 5 sets of heads I can use on my SS/DA and AH car and not have to spend money as I planned to do having a new set done to legal specs with the valve cover bolt un-exposed. The 5 sets are much, much better than the legal set on the SS/DA car right now.

But this fight is really between the two major Hemi Builders. I'm just in search of the truth as I like to push the rules right to the limit but not over...

SPS · 11-25-2012, 10:58 AM

Man, you can over-complicate this.

Best you look up the dimensions of a bolt, any bolt. It is the major diameter of the bolt (or threaded hole) that you can't cut into.

Yes, this started with the hemi heads, but it affects everybody. The Chevy heads are right there as far as being cut.....have been for years.

Simple rule .

FJ

Ed Wright · 11-25-2012, 01:26 PM

I just don't get what is so hard to understand here.

SSDA Hemi · 11-25-2012, 02:58 PM

FJ, you just contradicted yourself with your two posts.

I was being sarcastic with my question as to what ANY PART means!

Alot of people don't understand whats really going on here. Next week after gainesville you may understand why Pizza Joe started this thread. And it wasn't on my behalf.

11-22-2012, 06:33 PM	#1
SSDA Hemi Senior Member Join Date: Nov 2005 Location: NJ Posts: 503 Likes: 130 Liked 451 Times in 77 Posts	Re: superstock hemi heads Part of the problem is the intake face on a Hemi is not at a 90 degree angle to the valve cover surface so the threads of the valve cover bolt breaks through at the bottom of the threads before you are close at the valve cover . A simple wording of "valve cover bolt hole at the valve cover rail" would in fact keep a majority of the heads legal, BUT- why should some heads be exempt and some be outlawed? All the heads have gone through tech. Legal yesterday but not today. The heads that are milled into the bolt at the rail need a spacer greater than what is milled to be legal and port volumes adjusted to correct cc's. No new Heads can be built this way. Old heads grandfathered in. Like Eric Jones stated " a few thousandths one way or the other isn't going to kill the head"

11-23-2012, 07:10 PM	#2
Hemi Moose VIP Member Join Date: Jan 2010 Posts: 2,824 Likes: 0 Liked 12 Times in 12 Posts	Re: superstock hemi heads Are there any plans for the parties involved to sit down with NHRA and have a pow-wow, because this can't go on it will only hurt the class the drivers & owners involved and especially the fans!!!

11-24-2012, 09:12 AM	#3
SPS Member Join Date: Jun 2004 Location: Cayuga, Canada Posts: 298 Likes: 37 Liked 3 Times in 2 Posts	Re: superstock hemi heads I really don't know why anybody would argue this with Charlie. He likely knows and has seen more of whats going on than anybody. Besides, as he said, this rule has been in the book and accepted for ever. A lot older than 1991. It also affects all other engines (Chevys for sure) too. As Charlie said, "where do you stop milling??" at the valve guide?? The cylinder head guys (the majority) have honoured this rule to date, so it is what it is. FJ

11-24-2012, 05:02 PM	#4
SSDA Hemi Senior Member Join Date: Nov 2005 Location: NJ Posts: 503 Likes: 130 Liked 451 Times in 77 Posts	Re: superstock hemi heads FJ, that is why the first call I made regarding this subject was to confirm that NHRA told John Gulius this was not allowed on a sbc… Intake side of head may not be cut into ANY PART of valve cover bolt holes Maybe "Any" means valve cover rail…(sarcasm) I hope I'm wrong as I'll have 5 sets of heads I can use on my SS/DA and AH car and not have to spend money as I planned to do having a new set done to legal specs with the valve cover bolt un-exposed. The 5 sets are much, much better than the legal set on the SS/DA car right now. But this fight is really between the two major Hemi Builders. I'm just in search of the truth as I like to push the rules right to the limit but not over... Last edited by SSDA Hemi; 11-25-2012 at 02:59 PM.

11-25-2012, 10:58 AM	#5
SPS Member Join Date: Jun 2004 Location: Cayuga, Canada Posts: 298 Likes: 37 Liked 3 Times in 2 Posts	Re: superstock hemi heads Man, you can over-complicate this. Best you look up the dimensions of a bolt, any bolt. It is the major diameter of the bolt (or threaded hole) that you can't cut into. Yes, this started with the hemi heads, but it affects everybody. The Chevy heads are right there as far as being cut.....have been for years. Simple rule . FJ

11-25-2012, 01:26 PM	#6
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: superstock hemi heads I just don't get what is so hard to understand here. __________________ Ed Wright 4156 SS/JA

11-25-2012, 02:58 PM	#7
SSDA Hemi Senior Member Join Date: Nov 2005 Location: NJ Posts: 503 Likes: 130 Liked 451 Times in 77 Posts	Re: superstock hemi heads FJ, you just contradicted yourself with your two posts. I was being sarcastic with my question as to what ANY PART means! Alot of people don't understand whats really going on here. Next week after gainesville you may understand why Pizza Joe started this thread. And it wasn't on my behalf.