Well,....After reading all the other posts on the subject I have some to add,..................68 and up will phit fysically.............I believe ( and could be wrong ) the lids with only two sets of louvers was a 2 year thang..........70-71. All newer than that would have the "four set " lids.
The bit about having enough air is two-fold..............If you're just ruinning a 1600, you can get by with just changing to the "two sets" lid.............but will have to put standoffs of some kind ( lower or upper ) on anything larger...........without some other mods, but would be advised to stay with what you have. ( my opinion )
The second of the "two-fold" air issue , is that you can cause your engine to starve for air to use for combustion due to a vaccum formed by the fan sucking all the air into the compartment, and pushing it out through the heaters.................this would happen if you have the heaters, or not, cause it'll still shoot all your air out around the engine , causing a low pressure in there and enriching your fuel air mixture in a most peculiar fashion.................you'll likely have a car that runs a while on the freeway then just dies,.............flooded of course, then you'll be able to just jump in and start it when you and your friends get back with the tow vehicle.
There is always a way around all these concerns. I shall attempt to introduce an idea, for lack of a model.
It's possible to just do what you are talking about, if you supply another source for your intake air, both for cooling and for combustion...............two seperate sources would be best, to eliminate the second of the Two-fold issues.
I'd suspect you'd want to make darn certain you don't try and pull air in from around, behind or near the engine, as it will be HOT air. Not a great thing for cooling air to be hot , ya know. However, it might not be such a bad idea to be able to control your air temp to the engine manifold/carb..............warm air to keep carb icing down in the winter sounds like a good idea to me.
Now, All that I have said so far has no model, but does put some fairly important info in front of any of the folks looking to read about things to be aware of for such a interchange..................So, take a minute or two, and see if you can come up with something that's gonna spin heads with the rest of us,...........................I have my ideas still, but have not atttempted the application ye, and look forward to seeing any kind of practical application of this stuff.
Hope this helps.
( any of you guys with the car that quits after a few on th highway see anything that'll help here?)
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