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This is a rebuilt 1969 351W with same thermostat 180, new water pump, same radiator with 13lb cap, new temp sender, fan installed correctly. I don't think I'm forgetting anything.

When I was first breaking in the engine at 2000-2500 rpm the temp guage would read middle with a very slight lean to hot. It was always consistent even when idled. I was also breaking it in on open headers.

After installing a new exhaust system the engine is now overheating in idle in less than 10 min. I always thought the heat would decrease. The temp gauge is now going full hot. I can see coolant in the tube on the radiator building up.

Before I start buying new parts I really need some ideas. Its bugging me out
 

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This is almost always because of an undersized electric fan, missing shroud or the need of an electric fan. how is the radiator? remember, at 2000 rpm your fan moved high cfm through the rad, at 750rpm it is greatly reduced. Check your timing, believe it or not low or high timing affects heating. good luck
Joe
 
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