Quote:
Originally Posted by oldskool
OK, I got another dummy question for you guys who know what the rules were for AHRA & IHRA.
I seem to remember several differences, from NHRA rules.
I have some pics of the 1970 Knafel GTO, nat record holder. It appears to be running in the 2-FA or FA-2 class. So, exactly what is that ? Is it a Stock class ? SS ? 
We attended the World Nats race in Amarillo, in '76, IIRC. We saw a car there named "Packin Poncho". It was a '69 GTO, with a hood scoop. Looks like it ran in the SS3 class. Can someone here clarify the AHRA/IHRA rules, for Stock/SS ? |
The Knafel GTO was probably running the AHRA Formula Stock class. AHRA considered this a Stock class but was more like Super Stock, hood scoops, aftermarket intakes, any size tire that would fit in the stock wheel well, etc. Formula 1 was for cars with multiple carbs, Formula 2 was for four barrel cars, and Formula 3 was for 2 barrel cars.
IHRA was Super Stock, I believe they were based on the same formula as AHRA Formula stock but had also had a SS/4 class that was for NHRA legal cars.