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You can buy silicone hose reducers or spin an adapter up in the lathe and have a join in the lower hose. Thinking about it a rubber sleeve with 2 back to back hose clips would work. Use the worm gear clips. Might be a trick finding something with a wall thickness 1/8. The bulge on the end of...

I would try a new Stant thermostat first.

Speedway Motors has some good tech articles on fans/shrouds etc on their web site you may find helpful. You may find a good shroud is all you need - they can make a big difference. Your 22 inch radiator if good is probably OK. At least an aluminium radiator is easy to weld tags to for shroud mounts.

What about a Cold Case radiator and using a fan shroud - this would probably nail it.

Those sensors are essentially a variable ground. Teflon tape often does not cause a problem but as pnora said - too much and you can get problems.

Install tip if interested - use some thread sealer as in dadsbee post and do not over-tighten it. Only tight enough to prevent a leak.

Year One sells the correct sender for a stock gauge. I have fitted their sender and it works. Sorry cannot remember the part number. Just get the one for gauges.

The purpose of the by-pass is to allow some water to circulate when the thermostat is closed. It will make the engine take a little longer to warm up. But - what it does is it warms gently the whole coolant system as the engine heats up. If you do not have a bypass when the thermostat opens the...

If it is air bubbles this can cause erratic operation of the thermostat as well. You are trying what is simple first and that is a good plan.

I had a problem with similar issues with a 302 Ford Windsor in a hot rod truck - erratic temperature fluctuations on the gauge but no engine overheating , boiling or loss of fluid. Did all the usual things - still the same. Looped the highest up heater connection back to the water pump and...

You could be right about air pockets. The heater core if connected properly was designed to bleed any air out of the cooling system.

There is a good article on Speedway Motors toolbox articles titled "Does a fan shroud make a difference" that it would pay you to look at. I know there are a few electric fan haters out there but I always use them as they run full tilt at idle and you can free up around 14 HP. But they do need...

General rule of thumb is if the car gets hotter while idling you have an airflow problem across the core as suggested earlier. An engine makes say 100 horsepower at idle and 250 horsepower at 3000 rpm. The heat load is substantially more from 250 HP at 3000 rpm on the cooling system. If the...

Just a thought - there are two types of cap - recovery and non-recovery. If you have no recovery bottle use the non-recovery that eliminates the little valve. They are designed to allow air and fluid out of the radiator.

Have you raised the angle of the engine transmission too much. From the front of the car the engine /trans should have around 2 degrees downward slope. Is the actual radiator cap working correctly? Sometimes it is a simple fix overlooked.

You can buy a fitting that you cut the top hose and the joiner has a thread in it.

Not quite sure what you mean but this may help: Non recovery you need an air gap in the radiator to allow the water to expand when heated but not push the cap to excess pressure. Recovery the radiator is completely full and the water expands in to the tank and back when the engine cools. The...

Yes that is correct.

I do not know a part number but most caps for a brand (Mopar or other)have the same dimensions and similar pressure ratings. So a cap, say of an earlier car like a 1960's Dart would fit. I get these over here easily from local parts houses. The only difference between the two styles of cap...

The only water that should displace in to the overflow bottle from the radiator is the amount of water required to allow the water in the radiator to expand when heated. I am guessing but say no more than 1/2 of a litre. If a shitload is going over to the tank the water is being pressurised so...