With a suitable radiator, there is no need to close the horn openings. .
Can you kindly tell me precisely why you say "not true"?Not true..
Here is a posting that Duke put on the Forum awhile ago.
http://catmbr.org/VB_forum/showthread.php?t=1601&highlight=Horn+Holes
There were a lot of replies and discussions in that thread! And Duke followed up with an excellent article that appeared in Tiger Tales later.
David
Different cars different requirements.
Duke has a high Hp motor which would put out lots of heat. I know Duke is not one to cut corners.. so a stock upgraded system may not be enough for him.
IIRC the issue for him was not so much idle.. but on the run.. hence his solution.
Each to their own. There are benifits on a stock car by blocking the holes as detailed in TEAE... there can be benifits on a modified car.. maybe not required.. but helpful....
If your car has temp issues check the fundamentals.. hoses, radiator.. see if there is bloackage inthe block/heads... if all is fine.. then upgarde fan.. close off hround.. block horn holes... if not.. upgarde the radiator, add thermo fan..
Dont fix things that are working fine... dont bandaid problems as a fix if there is a core issue...
examine... assess... fix, modify, upgrade as needed.
My car, fortunately, don't need no stinkin' flaps or whatever. Could it be that I have a proper radiator? No, that's too simple an answer.
I made 2 sets--installed one and sent the other to Warren. I noticed a difference and hopefully it's not because the weather is cooling down. I used the template that was posted on the site awhile back and cut them out with 22 gauge steel.
Did you stamp faux part numbers in them to drive future restorers crazy?
He did not. We only use real part numbers even on reproduction AC housings.
I did not use them and ended up making alloy ones to match the purrty alloy radiator.
I bent a flap in and mounted to old horn bolt holes.
I noticed a difference on both of my in tune cars.
The alloy ones too some time to do nice. Last time I used a Home Depot galvanized metal shingle and some alloy gutter tape black paint and it was 5 min.
crude but effective.