Yes, coolant does go through the intake manifold. But its from side to side, not front to back as I recall.blueday wrote: ↑Tue Mar 07, 2023 10:40 pm Does the intake have coolant passages running through it front to back? I've never worked on these motors before. I come from sbc world.
I'll test the heater and watch temp tomorrow night. Moving the ir gun around the radiator and hoses are the coolest in the system. I'll also double check heater.
Previous owner had it since 2018 I believe and had it running around then. Has been sitting up since.
If I had a blown head gasket I'm between Cylinder and coolant passage I'm sure it would push air in the coolant and also seems like once cooled off it would leak coolant into Cylinder and I'd see some white smoke out the exhaust on start up plus maybe milky oil by now?
This is a good point. I would expect the manifold in the vicinity of the EGR valve and the carburetor heater to be hot. The heat riser directs 100% of one bank of exhaust gas through the intake manifold if closed. That will be HOT. The heat riser should open at operating temperatures and exhaust gas will then be available at low pressure through the manifold. This is enough to supply the EGR valve. While the engine warms, 1/2 of the total exhaust gas goes through the intake manifold cross-over passage, at considerable higher flow and pressure. This will get rocket hot if the heat riser valve does not open as the engine warms up.
He already has.candymancan wrote: ↑Thu Mar 09, 2023 11:43 am Look at his rusty coolant. Change the t stat.. change and flush all the coolant. This is probably the issue.
Hey that's good to know and makes me feel better about the drastic temp differences. Thanks.Scotty54 wrote: ↑Sat Mar 11, 2023 9:05 am One thing to add regarding manifold temp - AMC racers often add a coolant passage to the rear of the manifold to circulate coolant right to left in the rear of the engine. I don't think any of the off the shelf makers have this but I have seen exotics like Herman Lewis intakes or similar with this passage added. The F to R difference is normal.