The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 71 350 running hot coolant backup up problem

**Gregski** · 01-10-2018, 04:02 PM

ok just to level set here is an update, I realize the first gen small blocks have a coolant bypass in the block and the water pump on the passenger side, but just in case that was clogged I added a bypass hose from the intake manifold to the water pump, very common thing especially if you have vortec heads, lets call it insurance

this may have dropped the operating temps 5 degrees or so, not 100% sure because the ambient temperatures have dropped from the first test by like 10 degrees by the time I tested this fix, so who knows

we'll leave it on for now

pic of red engine is not my engine just some pic I stole off the interwebs, just thought this pic would be helpful for those of you following along at home, LOL (don't mind that "this needs to be drilled" comment)

01-10-2018, 04:02 PM	#28
Gregski Post Whore Join Date: Aug 2014 Location: Sacramento, CA Posts: 10,814	Re: 71 350 running hot coolant backup up problem ok just to level set here is an update, I realize the first gen small blocks have a coolant bypass in the block and the water pump on the passenger side, but just in case that was clogged I added a bypass hose from the intake manifold to the water pump, very common thing especially if you have vortec heads, lets call it insurance this may have dropped the operating temps 5 degrees or so, not 100% sure because the ambient temperatures have dropped from the first test by like 10 degrees by the time I tested this fix, so who knows we'll leave it on for now pic of red engine is not my engine just some pic I stole off the interwebs, just thought this pic would be helpful for those of you following along at home, LOL (don't mind that "this needs to be drilled" comment) Attached Images Last edited by Gregski; 01-10-2018 at 04:16 PM.