Stocker Cylinder Heads....
 

The head rules arent what's in the rulebook. Several engine builders have been told 1 thing and the tech officials something else. Tech's interpretations of the gray areas can be different and judgement calls vary from division to division.

There is a big difference between a stock head and a Stock Eliminator legal head. The legal bowl cut drastically changes the appearance, and its not mentioned in the rules.

CYLINDER HEADS
Must be correct casting number for year and horsepower claimed,
per NHRA Technical Bulletins or NHRA accepted. Porting,
polishing, welding, epoxying and acid-porting prohibited.
Combustion-chamber modifications prohibited. Cylinder heads are
additionally restricted in that they must retain original-size valves at
original angles +/- 1 degree and must be able to hold original
cylinder-head volume per NHRA Specifications. Runner volumes
may not exceed the current Super Stock cylinder-head volumes as
listed on www.NHRARacer.com. Regardless of the poured volume
measurement, any modifications to intake or exhaust runners
prohibited. Any evidence of modifications from the original castings
will be grounds for disqualifications as determined by NHRA in
NHRA’s sole and absolute discretion. Any aftermarket steel valve
permitted, must retain stock head and stem diameters. Only
engines OEM-equipped with sodium-filled valves may use sodiumfilled
replacement valves. Titanium prohibited. Hardened keepers
permitted. Lash caps prohibited. Valve-diameter tolerance: +.005-
inch or -.015-inch from NHRA Specs. The following are prohibited:
spark-plug adapters; cylinder-head studs; any grinding in ports or
combustion chambers; removal of any flashings; sandblasting or
any other modification to cylinder head; any film coating of intake
and exhaust runners; any film coating of combustion chamber.
Runners and combustion chamber must retain OEM appearance.
Final acceptance as determined by NHRA in NHRA’s sole and
absolute discretion. Intake side of head may not be cut into any part
of valve cover bolt holes. Heat riser passage may be blocked from
intake manifold side of cylinder head. Blocking passage down in
valve pocket prohibited. The following are permitted: polylocks, jam
nuts, screw-in larger-diameter rocker studs or pinned studs, bronzewall
valve guides. Valve spring umbrellas optional. Cylinder head
may have all of the seats replaced. Any valve job permitted,Oringing
prohibited. Exhaust plates prohibited.

We need the rulebook updated and clarified, please.

Wade

Re: Stocker Cylinder Heads....
 

The rule book is not going to get changed. It simply come down to a judgement call by the person doing the tear down.

Re: Stocker Cylinder Heads....
 

And this is why the 'Class' is nothing like it's 'original' intent.

Re: Stocker Cylinder Heads....
 

Well contoured replacement valve seats are the rich man's pocket porting.

Re: Stocker Cylinder Heads....
 

I heard something over the weekend that really got my attention as I never really thought of it that way.

"You don't read the rulebook to see what you can't do. You read it to see what you can do."

Re: Stocker Cylinder Heads....
 

We need consistency from one division to another. What we don't need is one tech person's " I don't like the way this looks".

Re: Stocker Cylinder Heads....
 

What is Wade talking about? Did something happen resently with his heads? Tech should be uniform from one division to another. If I run in division 4 and check out legal, and show up at division 3 with the same engine, it should check out legal as well. Provided the heads cc correctly, etc.

Re: Stocker Cylinder Heads....
 

The way the rules stand today, you may or may not be legal depending on who worked your heads and what division your torn down in. I currently want to purchase a new set of heads. I have talked to tech over the last 10 months about these cylinder head rumors and what will pass and what wont. If I'm going to spend $1700-$5200 dollars, I ask for 2 things, a lower et and to pass tech.

Its no secret that the top head guys are grinding, porting and covering up the work with acid, media or spray welding. It was done back in the day and still happens. If some are going to be told its ok, isnt that where I need to spend my money? You know their stuff should be faster.

All I want to know is 1) what are the current rules, 2) will tech be consistent, 3)is the person or people telling everyone its ok to grind and cover up going to stand by what he/they have told the engine builders, or flip back and use the written word as a scape goat.

Everyone one of you guys who know me know I'm not a **** stirrer and dont want to be considered one. Just get everyone on the same page. If the rulebook is law, update it and stand by it. If modifications are going to be ok, dont quote the rulebook to us. That judgement call BS has got to go.

There is no pride in running an illegal car for me. If I'm fortunate enough to stand there and hold a class win Wally, it will be because my car is LEGAL. I just need a little clarification on what that is.............

Re: Stocker Cylinder Heads....
 

There is no pride in running an illegal car for me. If I'm fortunate enough to stand there and hold a class win Wally, it will be because my car is LEGAL. I just need a little clarification on what that is.............


X2, btw Wade love the car all Black(no decals), good luck with your concerns.

Re: Stocker Cylinder Heads....
 

There was a story years ago about 2 chevelle wagons that had the Quarter panels spread apart for wider tires. It was illegal to spread the quarter panels apart for wider tires. One of the chevelles was obvious where they had used a hydralic jack to spread the quarters and not done any body work to finish it. The other chevelle had the quarters finished very nicely and you could not hardly tell anything had been done. Well at the U.S.Nationals the one that was obvious got bounced and the other one was allowed to run and the tech guys knew it had been done to both cars.. When you enter the grey area of the rules, you enter at your own risk. Good luck trying to get NHRA tech to tell you what they buy and what they won't. I am not trying to be a smart *** ,just repeating what a tech man once told me.