Stocker Valves

STK1217 · 03-20-2014, 07:31 PM

Are Under Cut and or Hollow Stems legal in NHRA Stock?

Alan Roehrich · 03-20-2014, 07:40 PM

Evidently. The rule book says that stainless can replace regular "steel" valves, the stem diameter and head diameter must match the OE spec in the guide, titanium is only legal if the OE part was titanium, and the stems may not be filled unless the OE part was.

Hollow stem undercut stainless valves with OE diameter heads and stems have been passing tech for some time now.

STK1217 · 03-20-2014, 07:50 PM

Thanks Alan
Better safe than sorry.

John Beasaw III · 03-21-2014, 09:07 AM

Here's a dumb question? Are longer than stock valves allowed?

Not sure if they are even needed. Just a question.

And im guessing the cut back stems are a no no too?

03-20-2014, 07:31 PM	#1
STK1217 Member Join Date: Nov 2006 Posts: 137 Likes: 48 Liked 10 Times in 7 Posts	Stocker Valves Are Under Cut and or Hollow Stems legal in NHRA Stock?

03-20-2014, 07:40 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,113 Likes: 1,571 Liked 1,827 Times in 414 Posts	Re: Stocker Valves Evidently. The rule book says that stainless can replace regular "steel" valves, the stem diameter and head diameter must match the OE spec in the guide, titanium is only legal if the OE part was titanium, and the stems may not be filled unless the OE part was. Hollow stem undercut stainless valves with OE diameter heads and stems have been passing tech for some time now. __________________ Alan Roehrich 212A G/S

03-20-2014, 07:50 PM	#3
STK1217 Member Join Date: Nov 2006 Posts: 137 Likes: 48 Liked 10 Times in 7 Posts	Re: Stocker Valves Thanks Alan Better safe than sorry.

03-21-2014, 09:07 AM	#4
John Beasaw III Member Join Date: Jan 2002 Location: Marion, N.Y. Posts: 126 Likes: 0 Liked 2 Times in 2 Posts	Re: Stocker Valves Here's a dumb question? Are longer than stock valves allowed? Not sure if they are even needed. Just a question. And im guessing the cut back stems are a no no too?