I'm still working on this '67 Firebird that belongs to a local guy. I have completed some suspension upgrades and installed the interior and am now tackling the drivetrain concerns.
I took it for a 1.5 mile drive, after idling for a few minutes, and the temp went to 207 degrees before I shut it down. He had said he hasn't been driving it because it quickly runs up to 210 degrees. A few minutes after I shut it down I used the laser thermometer that read 187 at the intake manifold beside the thermometer sending unit. I expected it to read higher than that.
To help I installed a set of the factory design closeout panels between the radiator bracket and the nose of the car. I had installed a thinner fan spacer to pull the fan out of the shroud but then the fan blades hit the power steering pump.
Presently it has a 2" spacer, my .5" spacer placed the fan blades about 1/3 into the shroud but as said the blades hit the steering pump. I have already boiled the thermostat on the stovetop to determine it fully opened at 180 degrees. I'm confident it is okay. It has a BeCool aluminum radiator that should be very sufficient.
One thing I noted is this engine has a bad dieseling problem when shut down. Also, for the short drive, I noted hesitation when accelerating. This engine was built by a local guy but he hasn't been able to give me any specifics.
So, might the root cause of all this be timing? Should I shoot for 36 degrees BTDC? I know I also need to check centrifugal advance and vacuum advance. I believe presently it has 87 octane gasoline and just about empty. I will refill with some 93 octane non-ethanol.
I figured I would check timing in the morning before the heat of the day. Right now outside it is 90 degrees with enough humidity to make it uncomfortable. So, I'm taking a break from it.