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-   -   Stocker Valves (https://classracer.com/classforum/showthread.php?t=52299)

STK1217 03-20-2014 07:31 PM
Stocker Valves
 
Are Under Cut and or Hollow Stems legal in NHRA Stock?

Alan Roehrich 03-20-2014 07:40 PM
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.

STK1217 03-20-2014 07:50 PM
Re: Stocker Valves
 
Thanks Alan
Better safe than sorry.

John Beasaw III 03-21-2014 09:07 AM
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?


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