Those headers sure run hot, even right after startup! Got a loaner of a FLIR camera from work, so was able to map out the engine bay.
View attachment 1715205212
Also checked the timing, it 20° initial at idle, and total advance is 34° by around 2500rpm.
A/F ratio is currently 13.5:1 at idle and 12:1 under load.
Neither of these appear to be a source of excess heat.
(Will pull the plugs and compression test tomorrow after work)
So, for the cooling system:
Thermostat housing: 208°F (180° thermostat installed)
View attachment 1715205213
Upper Hose: 170°F (rubber insulates)
View attachment 1715205214
Lower Hose: 167°F
View attachment 1715205216
Top of Rad Tank: 210°F
Bottom of Rad Tank: 201°F
View attachment 1715205215
So based on all that, I strongly suspect that the water is flowing to the radiator, but in such low volume that it cannot cool the engine?
Failing water pump?
It's and old one, I probably should have installed a high flow one when rebuilding the engine. Didn't think about that until now!
