Clean Air Hose Carburetor

[Duke W.]

Re: Clean Air Hose Carburetor

Note the dashed line inside the exhaust manifold in post 3#. That is a steel tube pressed into the manifold. lower tube and upper tube to the choke housing slip into this tube pressed into the manifold.

This tube can rust out allowing exhaust gas to be drawn into the choke housing and this will quickly foul the choke vacuum break system, so if your choke gets sticky you need to check all the pieces, inlet to outlet as follows.

Rubber hose from carb air horn nipple to lower pipe

Lower pipe that fits into steel tube pressed into manifold.
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Manifold tube (part of the manifold installed at Flint, so not specifically called out in the AIM)

upper pipe from manifold tube to choke housing.

Duke

[Peter M.]

Re: Clean Air Hose Carburetor

Have a look at the pictures in Noland's book. It appears the 1963 routing is different than 1964 and 65.
Kind regards.

[Thomas B.]

Re: Clean Air Hose Carburetor

Don Cheema, I take it you have successfully installed this tube on your car. Can you share a few details? Which engine do you have, do you have ac or no ac, which vendor did you buy it from and part number and how easy or difficult was it to install? I plan to attempt installing on my car this spring. Thanks much

[Thomas B.]

Re: Clean Air Hose Carburetor

Here's a pic from Engine Builder Mag website for an L75 showing the tube installation.

[Leif A.]

Re: Clean Air Hose Carburetor

Gotta love it when a newbie member (original PO) starts a thread asking a question...gets 19 responses for solutions to his problem and, yet, 25 days later all you get back from the OP is crickets. No resolution whatsoever. GRRRRRR!!!

[John F.]

Re: Clean Air Hose Carburetor

I never started the thread, but I just installed mine on my L76, it is different from the L75. I had to remove the PS splash shield, starter heat shield, rear ignition shield on PS, and get the (-) battery cable out of the way. Got it all in with a few choice words.

[Thomas B.]

Re: Clean Air Hose Carburetor

John,

Where did you find the correct tube for the L76?

[John F.]

Re: Clean Air Hose Carburetor

Corvette Central Part#352205.

[Thomas B.]

Re: Clean Air Hose Carburetor

Corvette Central part description for #352205 indicates for 1964-65 carbureted engines. They show #351270 for 1963-63 all, 1964-65 with fuel injection. Is it possible this was a late 63 production change? The date on AIM Sheet 4.00 for L76 (see earlier post) is 6-7-63. Is this the initial release date for that sheet?

Found similar info at Vette Products of Michigan. Part #4002 for 1964-65. Part #4000 for 1962-63.

Both vendors say for carbureted engines with no distinction between engine options.

[Harry S.]

Re: Clean Air Hose Carburetor

Is the CC part steel (magnetic) or non-magnetic stainless steel?

Don, do you have a 250hp engine or 300hp? Both schematics are in this thread.

[Thomas B.]

Re: Clean Air Hose Carburetor

They don't indicate magnetic or non-magnetic. Is that important?

I should say they don't indicate type of steel.

[Harry S.]

Re: Clean Air Hose Carburetor

They don't indicate magnetic or non-magnetic. Is that important?

I should say they don't indicate type of steel.

Original was steel (magnetic), some of the reproduction piping is stainless steel. If you are going to flight judge your car then locate steel. If you are not going to Flight judge the car then stainless is ok.

[Thomas B.]

Re: Clean Air Hose Carburetor

Harry,
Do you know which tube would be correct for an early '63 per my previous post? Would the special tube per the AIM for the L76 be for late 63 only?

Thanks

[Harry S.]

Re: Clean Air Hose Carburetor

I just went back and read through the thread. It appears some of the posts confuse the choke tube with the fresh air tube. The tube to the choke is just there to provide heat to the spring inside the choke. It's a mechanical way to tell the engine you are up to temperature.

Best I can tell the 1963 fresh air tube is inserted into the underside of the manifold as far as needed to have the mounting bracket go over the stud for mounting.

The 63 part was 3817306, all engines base, L75, L76 and L84. Same part used in 64 and 65 on L84 engines.

I do not believe that part changed in 63.

[Thomas B.]

Re: Clean Air Hose Carburetor

Possibly I'm interpreting the AIM incorrectly. Looking at L76, Sheet 4.00 (see earlier post in this thread) I was led to believe the routing for the fresh air tube is different for the L76 than for the other engine options. I just noticed that a part number for the tube is not shown on that sheet. There is probably another sheet in the AIM for all engines where the part number is shown. I don't have access to my AIM right now but that's probably where I would see part number 3817306 for all engines as you pointed out.

Thank You