Stock Valve Job

Dave Turner · 01-21-2009, 08:17 PM

Can someone please tell me where to find the current valve job guidelines for Stock in the 2009 IHRA rulebook?....(now online).

Thanks

Greg Hill · 01-22-2009, 09:16 AM

My understanding is any valve job and any angle.

Mike Taylor 3601 · 01-22-2009, 09:44 AM

Have checked and doesn't say but are specs above&below seat still the same? total of.250'' or.125''per side larger than head of valve& down .250'' from top of seat still apply,diagram is gone from book and doesn't mentionit, unless I overlooked it.
Mike Taylor 3601
I didn't notice IHRA I was refering to NHRA are they still same on valve jobs?

Wade_Owens · 01-22-2009, 11:31 AM

Dave, far be it from me to have the answer, but, I would contact an engine builder you trust. They seem to have info thats not in the rulebook. It is very confusing as to what is legal, reading it in black and white.........

Wade

X-TECH MAN · 01-22-2009, 12:22 PM

As I understand it the top cut is as it always was being .250 larger than the seat cut. The bottom cut now can be any angle and/or depth. Its been about 7 years since I have kept up with this stuff but thats the latest info I have.

Fred Popov · 01-22-2009, 01:30 PM

It would be really nice if someone drew a diagram of the valve and seat. Just a simple 3-angle valve diagram with labels of the acceptable dimensions that meets the new NHRA valve rules....I have CAD software so if you have a sketch on the back of a napkin scan it and send it to me. I will gladly draw it and post it.

Dave Turner · 01-22-2009, 09:56 PM

Thank-you Mr. J. - I think I can follow that.

01-21-2009, 08:17 PM	#1
Dave Turner VIP Member Join Date: Oct 2005 Location: Schomberg, ON, Canada Posts: 1,222 Likes: 1,606 Liked 364 Times in 138 Posts	Stock Valve Job Can someone please tell me where to find the current valve job guidelines for Stock in the 2009 IHRA rulebook?....(now online). Thanks __________________ Dave Turner SS/GT #1153

01-22-2009, 09:16 AM	#2
Greg Hill VIP Member Join Date: May 2006 Location: Louisville , KY Posts: 1,995 Likes: 68 Liked 279 Times in 68 Posts	Re: Stock Valve Job My understanding is any valve job and any angle. __________________ Greg Hill 4171 STK

01-22-2009, 09:44 AM	#3
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,352 Likes: 315 Liked 249 Times in 88 Posts	Re: Stock Valve Job Have checked and doesn't say but are specs above&below seat still the same? total of.250'' or.125''per side larger than head of valve& down .250'' from top of seat still apply,diagram is gone from book and doesn't mentionit, unless I overlooked it. Mike Taylor 3601 I didn't notice IHRA I was refering to NHRA are they still same on valve jobs?

01-22-2009, 11:31 AM	#4
Wade_Owens Senior Member Join Date: Jul 2007 Posts: 578 Likes: 0 Liked 3 Times in 1 Post	Re: Stock Valve Job Dave, far be it from me to have the answer, but, I would contact an engine builder you trust. They seem to have info thats not in the rulebook. It is very confusing as to what is legal, reading it in black and white......... Wade

01-22-2009, 12:22 PM	#5
X-TECH MAN Banned Join Date: Dec 2007 Location: Lake Placid, Florida Posts: 3,203 Likes: 1,047 Liked 235 Times in 110 Posts	Re: Stock Valve Job As I understand it the top cut is as it always was being .250 larger than the seat cut. The bottom cut now can be any angle and/or depth. Its been about 7 years since I have kept up with this stuff but thats the latest info I have.

01-22-2009, 01:30 PM	#6
Fred Popov Junior Member Join Date: Sep 2007 Location: Chesapeake, VA Posts: 64 Likes: 0 Liked 0 Times in 0 Posts	Re: Stock Valve Job It would be really nice if someone drew a diagram of the valve and seat. Just a simple 3-angle valve diagram with labels of the acceptable dimensions that meets the new NHRA valve rules....I have CAD software so if you have a sketch on the back of a napkin scan it and send it to me. I will gladly draw it and post it.

01-22-2009, 09:56 PM	#7
Dave Turner VIP Member Join Date: Oct 2005 Location: Schomberg, ON, Canada Posts: 1,222 Likes: 1,606 Liked 364 Times in 138 Posts	Re: Stock Valve Job Thank-you Mr. J. - I think I can follow that. __________________ Dave Turner SS/GT #1153