1987 – 2004 Jeep YJ/TJ Chevy LSX Conversion Radiator – Downflow – Dual 11″ HPX Fans

When swapping your Jeep YJ or TJ to a SBC or LSX/LTX motor, you’ll find that 99% of the radiators out there are crossflows. And they won’t work like you want them to. Why is that? Well, there is a myth in the radiator world that crossflow radiators cool better than downflow radiators. And this is in fact a myth. The origins of this myth go back to the 1970s when radiators were made from copper and brass versus modern aluminum. In the copper/brass universe, downflow radiators were made with extra copious amounts of solder. This was because of the obvious: gravity. These radiators were subject to a lot more effects of gravity on the bottom of the radiator, hence they needed extra thick solder joints to keep the radiators from falling apart. The bottom tank of the radiator had to support all of the weight of the upper part of the radiator plus the coolant. With aluminum, due to it’s 4x strength compared to brazed copper and lighter weight, this is not the case. Downflow radiator cores are