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I have Tri-Y's in my 66 Shelby and think they're perfect. I don't believe they were made by Doug Thorley but I understand they make the best.

When you take things like ground clearance into effect I think you'll find the Tri-Y's attractive. I road race the car all the time in open track events and have at least as much power as anyone else.

"If you're under control you're not going fast enough"
Parnelli Jones
 

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I'm not familar with the part numbers but I have the Ceramic coated Hooker Super Comps on my 66'
with 302 manual trans. The fit was perfect, I bit of a challenge dealing with the Z bar, I'm sure it's that way with any headers. I don't have power steering so I can't comment on how that would be...

1966 Mustang Coupe, 302 custom roller cam, holley 650dp,http://www.289mustang.com
http://www.289mustang.com/images/vmfcar.jpg
 

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Discussion Starter #4
I currently have the Tri-Y's in mine also (backed up by a 2 1/2" exhaust ,crosssovers and flowmasters). The Tri-Y's are now 20 years old and a little too rusty. The real issue is that when I hit certain straightaways that I can come into fast (back straight with chicane at Watkins Glen or main straight at Limerock) I am running out of top end. I have a very tricked out Holley up front (webber jets etc..) and the O2 sensor doesn't go too lean. What carb CFm do you run and what is the diameter of your exhaust tubes. Have you tried a x-pipe crossover.

Thanks, Bob.
 
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