69 Tri-power Carborators

[Richard B.]

My carburetors are leaking and I have decided to rebuild them. I want to replace the inlet fittings but I'm not sure if the one I found on Holly.com is the correct one. Holly part # 26-26 Fitting, Carburetor Inlet, 7/8-20 in. Male to 5/8-18 in. Female Inverted Flare, 3/8 in. line, Brass.
I am ordering the renew kit Part # 37-474, and Idle Mixture Screws part #26-101. Are there any other parts that I should order when rebuilding the carburetors?
When they were rebuilt the last time they were colored gold dichromate, what is the correct color, is this a paint?

[Mark D.]

Re: 69 Tri-power Carborators

For tri-powers, gold is correct.

[Dick W.]

Re: 69 Tri-power Carborators

My carburetors are leaking and I have decided to rebuild them. I want to replace the inlet fittings but I'm not sure if the one I found on Holly.com is the correct one. Holly part # 26-26 Fitting, Carburetor Inlet, 7/8-20 in. Male to 5/8-18 in. Female Inverted Flare, 3/8 in. line, Brass.
I am ordering the renew kit Part # 37-474, and Idle Mixture Screws part #26-101. Are there any other parts that I should order when rebuilding the carburetors?
When they were rebuilt the last time they were colored gold dichromate, what is the correct color, is this a paint?

Gold dichromate is a plating finish

[Mark D.]

Re: 69 Tri-power Carborators

Black phosphate for the larger diameter 4-BBL carburetors.

[Bob K.]

Re: 69 Tri-power Carborators

Before you remove your carbs for rebuilding, try lowering the fuel level. Set them about an 1/8 in below the sight plug, so that you have to shake the car to the side to get fuel to come out. Todays fuels expands with the heat. Don't waste your money on the mixture screws.

[Dick W.]

Re: 69 Tri-power Carborators

Black phosphate for the larger diameter 4-BBL carburetors.

Where do the pink carburetors go?

[Chuck G.]

Re: 69 Tri-power Carborators

My carburetors are leaking and I have decided to rebuild them. I want to replace the inlet fittings but I'm not sure if the one I found on Holly.com is the correct one. Holly part # 26-26 Fitting, Carburetor Inlet, 7/8-20 in. Male to 5/8-18 in. Female Inverted Flare, 3/8 in. line, Brass.
I am ordering the renew kit Part # 37-474, and Idle Mixture Screws part #26-101. Are there any other parts that I should order when rebuilding the carburetors?
When they were rebuilt the last time they were colored gold dichromate, what is the correct color, is this a paint?

I just had my 3x2 400 HP carbs rebuilt. I did not replace the inlet fittings, nor did I replace any idle mix screws. After about 13 years, gas started shooting out of the end carbs. I think the nitrophyl floats were saturated and just wouldn't "float" anymore. I went through the process of removing the NV/S assemblies many times, cleaning them, and re-setting the float levels.

A rebuild cured my problem. FYI, I tried to find brass floats for the end carbs, and could not do so. I ended up getting the nitrophyl ones again. I hope they last another 13 years.

I didn't bother re-painting/replating the carbs this time. They still have some gold tinge from the previous rebuild.

Chuck

[Richard B.]

Re: 69 Tri-power Carborators

Thanks for all the info. I'm wondering if I should replace the floats, this is the third time I've had issues with them leaking when it sits for a month or two.
The only reason I'm replacing the idle screws is that the heads look a little stripped. What about the filters should they be replaced also?

[Chuck G.]

Re: 69 Tri-power Carborators

Thanks for all the info. I'm wondering if I should replace the floats, this is the third time I've had issues with them leaking when it sits for a month or two.
The only reason I'm replacing the idle screws is that the heads look a little stripped. What about the filters should they be replaced also?

Where are they leaking?

Chuck

[Wayne M.]

Re: 69 Tri-power Carborators

........ I want to replace the inlet fittings but I'm not sure if the one I found on Holly.com is the correct one. Holly part # 26-26 Fitting, Carburetor Inlet, 7/8-20 in. Male to 5/8-18 in. Female Inverted Flare, 3/8 in. line, Brass.

Richard; others --- I'm no C3 person, but are the original fuel inlet fittings not the ones I show in the pic below ? [thick 13/16" hex] These are on a complete late '69 L68 setup I bought in early '90s. outboards dated 951, center 4055 dated 981.

Some of the GM carb blueprints shown in Colvin's book seem to (visually) confirm this.

[Mark D.]

Re: 69 Tri-power Carborators

Yes, those are correct.

[Richard B.]

Re: 69 Tri-power Carborators

They are leaking around the inlet and the center carb is leaking at the bow gasket.

I purchased the tri-power on ebay the center and front cards have the inlet you show in the picture. The rear carb is slightly bigger
Two of the three are the same size. See attached photos.


TriPower_0001.JPG TriPower_0002.JPG TriPower_0003.JPG

[Chuck G.]

Re: 69 Tri-power Carburetors

All 3 of my fittings are the same.

My problem wasn't really "leakage". Gas was literally shooting out of the end carbs because the floats wouldn't "float" anymore.

Chuck

[Michael B.]

Re: 69 Tri-power Carborators

Wayne,

Those fittings are not correct for the Corvette. They are correct for the Dodge 6-Pack though.

[Richard B.]

Re: 69 Tri-power Carborators

Thank you Mike, do you by any chance know the correct part number for the correct fittings for the tri-power set up?