65 vs 66 Tri-Power
 

Questions,

Are they interchangeable?

I think the center carb flange is larger, is that true? Is there an adapter plate if running a '65 smaller center carb?

I have a '65 GTO, and I want to get a new tri-power intake and port the intake runners to match the #48 heads and intake gaskets (Fel Pro 1233), which are RAIV size.

I want to do it on a new one, so I don't have any down time on my car.

Thanks,

Brent

https://forums.maxperformanceinc.com...d.php?t=786314

Tri-Power intake identification.

Yes the 1966 intake is unique in that it uses all 3 large base Rochester carbs unlike the 1965 which uses a small base center carb.

The 1966 also uses a different choke setup, it has a thermostatic choke coil that mounts directly on the exhaust crossover unlike the 1965 which uses choke tubes and a choke coil mounted on the carb itself.

So it’s not quite as simple as using an adapter plate.

You can use the '66 aluminum repro intake. There are dual-mounting patttern Rochester 2 barrels used in big Pontiacs in the early '60's. I have several of them, which will bolt onto the '66 intake, but use the same choke, fuel lines, etc. as the '65 setup.

PM me for for details.

Is this what you are referring to Dick.

I think I'll just wait to find a '65. I want to port the intake runners to match my #48 heads and Fel Pro 1233 gasket, which I think are RAIV size. I want to leave the one on my car stock, so I'll get a new one to do the porting then swap it over.

I have a few of the throttle bodies that would work to put your smaller center carb on a '66 intake without an adaptor. That would be the easiest way to go if you already have a '66 intake. If not, I have six '65 intakes if you can't find one.

FWIW, the venturi size on the "small" '65 center carb is actually larger than the OEM '66 center carb.--1.250" vs. 1.180". Obviously, the throttle plates are smaller on the '65, but the smallest restriction, the venturi's, are larger in '65.

I'll DM you Dick.

I thought those double drilled bases were used on big cars when an "economy" option single carb was ordered, and it got a smaller venturi than even the 65 and earlier center carb.

You’re correct. Most of the “ economy carbs I have use the same 1.250” Venturi’s as the correct center ‘61 to ‘65 center carb.

In fact, the dual pattern base can be used with the correct Tri-Power center carb. You do need to use the “economy” fast idle cam assembly.

There is a 66 intake in the for sale section right now.

Have a few 66 intakes if any in need.

I would be interested in a 66 tripower intake. Feel free to call anytime.

Mike Wasson. 30.360.6385

65 vs 66 Tri-power
 

309.360.6385