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Should have a different impeller. 440'

I use hi-flow water pumps on my small block builds. Summit racing has them. A little pricey but worth every penny! 440'

Sounds like you have the cooling properly addressed. What pump are you running? Flow is the second part of the equation, I'd be looking at a high flow pump. 440'

Spectra most likely has what you need. 440'

Okay, do you know what you're pump and crank pulley diameters are? You might be under driving the water pump if the pulley is larger than the crank pulley. 440'

Are you currently running a high flow water pump? 440'

More flow better cooling. Use the aluminum housing with a hi flow pump. 440'

Like Jerry said, 8 blade! 440'

First, what's your current cooling system consistent of. Stock fan, pump, shroud? Typically, most cooling issues are due to lack of flow. The best improvement I've seen in addressing this issue is using a high performance water pump. They move way more coolant than a stock 6 blade impeller. 440'