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Robert Simpson · 03-30-2016, 02:43 PM

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??

03-30-2016, 02:43 PM	#5
Robert Simpson Senior Member Join Date: Aug 2004 Location: Jacksonville, Florida Posts: 808 Likes: 7 Liked 20 Times in 12 Posts	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??