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overheating issue resolved. I found a machinist locally who made me a very nice 5” water pump pulley which has increased my fan speed to the factory recommended 1.3:1 water pump pulley to cam shaft pulley ratio. Also added hood to radiator coil seal, replaced the water pump, and added a radiator...

I know this is ancient history, but what kind of “plastic bottle” rig did you set up? I want to add one to my 71 demon. The radiator overflow tube goes towards the driver side, where the battery is also installed so there is little space. Thanks Al Graham.

Thank you. I’ll call them tomorrow.

i am having cooling issues at low speeds/idle and am looking for a 5” water pump pulley. Where did you get a 51/4” pulley? The shop manual for my 71 318 and a/c calls for a fan to crankshaft pulley ratio of 1.3:1. My current set up gives me a .92:1. I want to leave the crankshaft pulley alone so...

Thanks to all. Starting at the beginning.

Thank you. I’ve done that and been reading for five days.

It overheated the same but lower temps. I replaced the radiator and added an NOS fan shroud. That was four years ago. I’ve hardly run the car since. These numbers are at least 20 degrees higher. I am going to measure the fan tomorrow, but it is a more stout fan than the original. When you say...

I have a 71 demon with a 318 engine and three speed transmission. During a restoration the engine was rebuilt. Modifications to the engine included a performance cam, Holley 4bbl carburetor, electronic ignition, and headers. I had some initial issues with engine overheating especially when...

BrianT, what is the ID of your upper radiator hose please?

What is the ID of this hose please?

I am driving a 71 demon with a 318 engine, 3 speed with a stock 22" radiator(new) and a 17" 7 blade fan. I have an autometer temp gauge that is accurate. I added a shroud last week. I have also installed an a/c from classic. The car heats up nicely to 180 and stays there unless when am stuck...

Autoxcuda mentions foam to seal around areas of shroud in the picture. I have a 71 demon with a stock radiator and a shroud like the one shown. What type foam do I need to get? I would imagine a rather closed cell one that will stand up to high temp. Any suggestions?