Cowl Induction Air Cleaner Question?

[RonNova396L34]

Mr70
I'm curious now about this. When I answered the question, I referred back to the Nova Times August 1998 article on the Shadow Gray NNN giveaway car. They show an original AC A212CW air filter and it has the square mesh. Is there any difference between the open air cleaner on the cowl induction hoods versus non cowl induction or closed element air cleaner? Seems to me, the air cleaner on my 70 Nova when I bought it from the original owner had the diamond mesh but I couldn't find any writing on it so I figured it had been replaced at some time. I think I've seen the square mesh reproduction being referred to as the correct one as original? Are both accepted as correct when it comes down to diamond judging? Or what is accepted as correct? Which one is found more commonly? I personally like the looks of the square mesh. Somehow I knew this would happen when I answered the question but I try to keep an open mind and try to learn something new every day.
Ron [img]/ubbthreads/images/graemlins/flag.gif[/img]