Re: Within Stock rules???
 

From the NHRA Rule book
“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.”

Based on this how is this motor legal?[/QUOTE]

If I remember correctly the heads were CNC from the factory? If that is the case how can NHRA prove that additional CNC had been done? Short of the cc's? When I first saw several years ago where CNC heads were installed on some of the super cars that clearly opened the door for additional porting. The thing I don't get from the article is the changing of the cam, to a larger grind? How can you tell this "Stocker" engine from a "SS" engine??

Re: Within Stock rules???
 

On the subject of the porting, you are correct. This was an issue on the SS AMX heads throughout their history. How do you know what is correct?


As for the camshaft specs, the .641" lift is what is in the Tech Bulletin, regardless of any advertising for the LS7. I suspect that some of the confusion is that people assume this engine is the same as the LS7 engine installed in Corvettes, but it is not. It is a spec engine for their Factory Shootout cars, not a production engine.

Re: Within Stock rules???
 

For most, the real issue is what the rule book says and what is currently being done and allowed .

Isn't it time for the rule book to reflect what is currently being done? For a racer to spend $1000+ to cover up what isn't being enforced certainly doesn't help the racer.

Maybe it's time for the rules to state: If the ports meet the CC's, the valve sizes are correct and there's no welding or epoxy, they pass.

Re: Within Stock rules???
 

I agree with you on this one Alan!

Not that I expect anything to every change
except maybe to get worse and more expensive!

Re: Within Stock rules???
 

That is exactly how the rule for porting in Super Stock was originally written. Given time and pressure, you have the current Super Stock head rule. Is that what you want? Be careful what you ask for or how brilliant you think your solution will be or what you give in to.

Re: Within Stock rules???
 

Just what I was thinking.

Re: Within Stock rules???
 

Dwight, you ain't just whistlin dixie, bud. :cool:


I know a couple of guys who could push some fast Super Stock heads through those loopholes. It's bad enough as it is.

Re: Within Stock rules???
 

All very good points, Dwight. -Al

Re: Within Stock rules???
 

If I remember correctly the heads were CNC from the factory? If that is the case how can NHRA prove that additional CNC had been done? Short of the cc's? When I first saw several years ago where CNC heads were installed on some of the super cars that clearly opened the door for additional porting. The thing I don't get from the article is the changing of the cam, to a larger grind? How can you tell this "Stocker" engine from a "SS" engine??[/QUOTE]

In this case it wouldn't be very hard they bragged about it in a magazine article.

Re: Within Stock rules???
 

Except what you are forgetting is that this is a school doing this. They disclose what they are doing because they use it as a teaching tool. Although I have not seen them at a NHRA race, if they are staying true to form from their NMRA days, they have their actual students working at the races. I think its cool that they are opening up and sharing with the masses , and at the same time training the next generation of engine builders.