Background: I have a 5752308 4100 on a 352 Thunderbird Special engine in a '58 Skyliner. I ended up replacing the jets last week to get them set for altitude (Denver) and had a few issues getting everything tuned. So I decided to pull the carb off and get it cleaned up. It had sat for several years after it's last rebuild so it's in pretty good shape.

Question: On the primary venturi assembly there are the sets of brass tubes that go down in the carb housing. The inner tubes on both sides are pressed up against the side of the outer tubes and are blocking a few of the holes on the outer tube. Is this a concern? If it is, how would you recommend getting the inner tubes to become more "cenetered" in the outer tube? I may have another primary venturi assembly laying around from a 5752309 4100 but they would definitely need some serious cleaning if they are compatible.

Thanks in advance for any information.

Kent

I assumed that this wasn't a huge issue and went ahead and reassembled the carb. I can always take that back out if needed. But I ran in to another little issue that needs some clarification.

The shop manual calls for a dry float setting of 0.435 - 0.465 inches from the float to the machined surface and a fuel level setting of 0.910 inches below the machined surface. The floats are nitrophyl and not the original brass but I still set the dry float setting first to the recommended range. After I put everything back on the car I checked the fuel level setting and it was around 0.7 inches. Therefore, it implies that I have too much fuel in the bowls.

Which measurement should I be following? The dry float setting or the fuel height setting?

Any help would be appreciated.

Thank you,

Kent

I would follow the wet float setting - especially since the specs are for brass floats. The fuel level is what really matters in the end anyway.

I've never personally done it; but I understand you can adjust this when the car is running.

I'd leave the brass tubes in the booster alone. If you botch the repair - repairing the repair would be difficult at best. I had a similar situation 5 or 6 years ago; I explained it to John at Pony Carbs - he said it wouldn't be a problem. But; if I really wanted to remove the brass tubes, do it with heat.

I didn't think the misaligned tubes would create a huge problem but I thought I should ask. Still need to get around to resetting the floats to give me the correct fuel height. Hopefully, I can get that done this weekend.

Thanks again,

Kent