Ok guys... little feedback from my side.
After having LOTS of overheating and radiator leaking problems I did take the risk to have bring me a new radiator from Europe to Argentina and smuggle it through the customs. It worked all fine and it was fitted within about 1hour!
Bought it from All American Imports. Comes as a complete bolt on kit with new extra long shroud, longer bottom hose, rubbers on brackets, deeper bottom plastic cover and radiator cap. Price 489EUR. All original Toyota. But they don't want to tell the part number. Not sure why it's so secret, but I respect that.
I installed it on my 1993 HZJ75, although it's made for a HZJ7/79. Everything fit just perfect, except the overflow tank bracket I need to change.
The radiator is much taller than the HZJ78 and also taller than my old crappy australian brass 4 row radiator.
I just drove on flat roads so far, no pass yet! Hope to be able to test it soon and see how much better it cools down! So far the needled stayed at 72degrees on small hills! But this was not a problem before either. (see other overheating thread for 1HZ I made lately)
I took some pictures and measurements:
Old radiator: the core is about 6cm thick
New radiator: the core is about 5.5cm thick, about 0.5cm thinner than old one
Old radiator: the core is 51x50cm in size
New radiator: the core is 51x56cm in size, that's about 12% increase in surface
Old radiator: has 43 vertical bars/rows or how you call them
New radiator: has 59 vertical bars&rows and they are thinner than on the old one
Old radiator: ribs are regular
New radiator: ribs are super fine, looks like they would have much more surface than the brass radiator ribs!
Some pictures...
My old HZJ75 4 row brass radiator vs. the new one. Tanks are less tall on new one but the whole radiator is about 6cm taller.
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This picture they sent me. It's the standart HZJ78 vs. their taller radiator:
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That's how the old ribs looked like on my brass radiator:
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And this are the new ones. Very fine!
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A picture from top, did fit perfect:
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