Thread: fresh rebuilt 350 overheating rapidly and extremely low oil pressure

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Yaa'all over thinking it.

I say radiator. It's a common issue. Your rebuilt motor is way more efficient now, and cooking that dino to higher BTUs. Your old rad can't keep up. Have it serviced or replaced.

Originally Posted by firebird77clone

Yaa'all over thinking it.

I say radiator. It's a common issue. Your rebuilt motor is way more efficient now, and cooking that dino to higher BTUs. Your old rad can't keep up. Have it serviced or replaced.

I don't agree. This is a mild build, not that far from stock and an old radiator may have reduced capacity but it's not going to exhibit the fast temperature spike described. A radiator problem will be one that keeps creeping up and cannot handle capacity over time, IMO. You're saying that you can't even get past startup and the temperature is spiking. Here's link hat shows the back side of the two styles of pumps, and you can tell by the flow path which one you have. The impeller may not be so easy, but as noted at the bottom of the page it doesn't "cup" water, but creates a pressure difference that slings the water out the ends - Direction of water pump | FlowKooler Water Pumps - Chevy, Dodge, Jeep, Ford, & more There may be better links out there, but this one popped up early in the quest.