My 71 Duster work in progress

[b-body-bob]

The stupid thing still gets hot. 220 in the garage before I turned it off.

Maybe it's the fan. It didn't seem too enthusiastic about sucking in a paper towel held in front of the radiator. Maybe it's not getting enough air???

I've got a flex fan that came on the 400 that I could try in place of the 7-blade /6 w/ A/C fan that's on it.

I might need to monkey with the timing and carb too but it's starts/runs good enough that I doubt that would be out far enough to make it overheat.

 

[68R/T]

Maybe it's the fan. It didn't seem too enthusiastic about sucking in a paper towel held in front of the radiator. Maybe it's not getting enough air???

Definitely sounds like airflow issue.

 

[b-body-bob]

Definitely sounds like airflow issue.

In addition to the flex fan I've got an OEM electric fan from something or the other that cooled the roadrunner at the track, but I think it might be too wide for a 22" radiator. I'll dig those two fans out and see if they help anything. FWIW the flex fan is too large to fit inside the shroud so I might not mess with that. The e-fan, being an OEM part, has a shroud and rubber seal.

Another gotcha are the Cold Case shroud attachments - the factory style shroud fit, but the attachments stand off the radiator about an inch. So there's a gap all the way around it. I will probably try to fill that with some cardboard and gorilla tape - that might help. The fan is toward the engine side so it seems plausible that the fan is pulling air from around the shroud as much or more than it's pulling through the radiator.

At least I don't have to drain anything to work on it now.