440 Highway temps

[zombezoo]

Drivers head gasket looked better, bolts were more even to take out. Same white exhaust valves on the back two cylinders and darker valves on the front two. Seems that the back TBI assembly runs leaner than the front (Dual quad) so perhaps lean condition may be a contributing factor.

Will report back after work is done if highway temps get better. Thanks for the ideas, there are a few suspect items to chase here.

 

[Geoff 2]

White exh valves can be from coolant entering the cyls. Was the engine using coolant?

 

[zombezoo]

Hard to tell, it has a slow leak where the pump mounts to the housing I have yet to fix. It's on the list before I add the coolant back in.

EDIT:
I will add, I don't think it was burning coolant, the back 4 cylinders on both sides had white valves (dual quad setup), there was no coolant smell, and the cylinders did not look clean like coolant consuming cylinders usually do, every cylinder had carbon build up on the piston tops.

 

[josephqatarcarguy]

i have exactly the same problem but the weather here in Qatar is just insane , 115f but yea - if the engine temps come down when off the highway and at low rpms i wouldn't worry about it ... depending on what the weather there is 220-230 isn't overheating if engine temp comes down at lower RPMS.

440 heating only on highway speeds

 

[RJRENTON]

i have exactly the same problem but the weather here in Qatar is just insane , 115f but yea - if the engine temps come down when off the highway and at low rpms i wouldn't worry about it ... depending on what the weather there is 220-230 isn't overheating if engine temp comes down at lower RPMS.

440 heating only on highway speeds

Wow.....all I can say is Qatar is a great place to be FROM......stay cool, the best you can......
BOB RENTON

 

[PlymouthMakesIt]

You need to make sure your EFI system is advancing the timing properly, if it's not fully advanced by 2500rpm it will overheat quickly. Needs to be at least 35-40 degrees at cruise. I have no idea how your system controls the timing but it needs to be programmed to fully advance by about 2k and add a little extra at light load high vacuum cruising.

 

[#41]

Could have discovered this much easier by reading the plugs as previously suggested, but at least you are onto the real issue. Hope you get it resolved soon.

 

[zombezoo]

Could have discovered this much easier by reading the plugs as previously suggested, but at least you are onto the real issue. Hope you get it resolved soon.

These were the plugs. They told me I had a valve seal problem...

Stealth heads are installed. I reinstalled the old plugs to get it running, i will put in a fresh set and re-read them after a bit. I will say the new heads definitely run better.