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Recently I found this post on the forum, and the following picture from John 65's cowl induction that he made for his Vette.
It looks a very simple DIY, because the 'lining' to cut the hole is already molded on the inside of the hood itself. https://www.corvetteforum.com/forums...ood-vents.html
I read that from 1973 - 1976 the C3 had a cowl induction system with a valve that opened and closed. Why did they remove that feature? I 'd think it would be very good to get fresh air in.
Would it hurt the engine when I cut a hole in the hood where 'John 65' did, to function as a permanent cowl induction?
Last edited by Novusuhu; Jul 23, 2018 at 09:23 PM.
Would it hurt the engine when I cut a hole in the hood where 'John 65' did, to function as a permanent cowl induction?
No, it would not hurt your engine at all to cut that air hole.
However, in order to be a real "cowl induction" set up it would need to have the seal in place between the air cleaner body and the hood. It certainly won't hurt to get some more air in there.
The cowl induction proved to be less than stellar in the performance area and was dropped by GM. But the discontinuation was due more to the loud noise produced at full throttle than anything else. It was not really GM's choice at the time, rather a government mandated Noise Standard handed down to them from the newly formed Environmental Protection Agency.
I have the factory cowl induction system on my '73. It functions as designed and I have to tell you, I love the way it howls at full throttle. There is no mistaking the sound of those Rochester secondaries opening.
I installed the 73-76 cowl induction grille on my 77 but I did mine strictly because I like the look of the grille in the hood. Yes you can install the complete system ( which I did not) but you would have to modify the inner structure of your hood to accommodate the air path from the air cleaner to the vent.
Last edited by persuader; Jul 24, 2018 at 02:55 AM.
I installed the 73-76 cowl induction grille on my 77 but I did mine strictly because I like the look of the grille in the hood. Yes you can install the complete system ( which I did not) but you would have to modify the inner structure of your hood to accommodate the air path from the air cleaner to the vent.
I think I will stay by only cutting a hole under the hood were you can't see it (like in the picture of John 69). Maybe in the future I'll ad the top grill.
What is a good and 'cheap' material to make an air tunnel from the hole to the air cleaner? How can I fasten it to the hood?(not permanently)
get sheet metal for duct work. cut, bend, pop rivet it together where it fits good. now you have a mold to make it out of glass. lots of wax before pouring in the resin...
77 DIY 'cowl induction'
