66 Valiant slant six radiator upgrade/swap

Thanks, very helpful. A split upper seam is an endemic problem w/ the early round-top radiators. One shop said they solder in an internal brace to avoid that. The later square-top ones work better, but don't look correct.

Slants don't leave much room. Note how they recessed the water pump in the block and put a pulley groove in the damper to squeeze them into an early A. You have a thick radiator, but still ample room. If you have 3", the thin fan-clutch for my 1985 M-B 300D should fit. In my 64 Valiant, I have just 2.5" so could barely fit a nylon flex fan, leaving ~3/4" to the radiator. When I bought it, it had no fan, just an electric pusher (M-B) rigged to run all the time directly off IGN (yep, melted the key switch), w/ 2-core radiator from "not a Mopar".