x2 for keeping it clean. I just had the original radiator rodded out on Medina, my '71 T-code Monaco, and
@71Polara383 tells me that she once again is cooling properly. I'll be driving that car for the first time since the cleaning for several hundred miles this coming weekend at the 2020
CATL, so I'll be able to judge for myself.
There is a (very expensive) OEM alternative, Glen Ray.
@saforwardlook has used their services -- see
here.
@Trace 300 Hurst has only good things to say about the Spectra Premium CU332. He drive his Hurst in Florida weather with it. To quote him:
"The Spectra and a redo of the entire cooling system -- back flushing the engine, new stat and housing, all new hoses, hidden overflow tank to keep air out of the system, checked for correct pump -- solved the (overheating). Recently I (installed) the correct repro 7-blade and thermal clutch unit (from Tony's) and now I have a quiet, OEM looking 190* system. Love it. Note: I run 16 degrees timing with the dizzy limited to 18 degrees mechanical advance (FBO Mopar Distributor Limiter Plate) and this timing setting also helps with engine heat, gives instant starting, and outstanding low-end power."
I bought a CU332 for Snow White (my '70 N-code Polara 'vert) on the strength of that recommendation and because the CU332 looks almost factory (and because Snow had already lost her original rad at some point in the 30 years when the previous owner had her). When I made the call not to take Snow to Carlisle this year, I lent the still-in-the-box CU332 to Wyatt for Elvira, her T-code sister. Wyatt's experience on the trip from IL to PA and back was that his car ran too hot when outside temps were high but the radiator did fine in cooler climes. I'll see how the SP performs once installed in Snow White, hopefully sometime this month. FWIW, both Elvira's and Snow's engines have been rebuilt.