Well the little truck has always run hot, too hot for comfort.
Well apparently it was hotter than the small block wanted, and it warped the heads
I had to swap out the milled "587" 360 Heads (warped 6 thousandths on one, 8 on the other) for a set of Milled 340 J Heads (with 1.88 Valves)
That's when I found out this motor had brand new Forged Domed Pistons in it, was bored .060 Over, and still had Crosshatch in the Cylinders
Somebody sunk a lot of money in that 273 not long before I got it
The little 273 really hauled after the head swap, you'd swear it was a drag car (gee I wonder why, high lift cam, high compression, and a 340 top end). But it wanted to run hot (I was hoping the heads had been warped all along and that was the cause, but it wasn't)
So to save my J Heads and the money spent on gaskets, I pulled over and left the truck cool down, and then returned to the garage to attempt to fit a bigger radiator in the truck. Right away it was obvious I wasn't going to get one in there without a BFH and some serious elbow grease. Another thing was clear, I wanted a radiator capable of cooling the 273 with ease.
Left to Right : B-Body 2-Core Radiator, D50 "Diesel" Radiator, "Super Radiator!" (C-Body 4-Core 440 w/ AC Radiator)
In the truck...
I had to remove the mounting brackets, it wouldn't fit with them on. (so I had to solder 4 individual brackets on the top & bottom tanks, to bolt to the top and bottom of the core support). 2 of the cores on the left side (right side in the picture) were damaged at one time and I had cut them off and soldered them shut at the tanks. It won't matter much, since it was plenty capable of cooling the 340 in my '74 Duster as is.
Sadly, I had to cut my front bumper and have to relocate my winch, since the radiator from my '74 Duster is a lot taller than the D50 radiator (Which already sat on top of the winch)