The Improved racing unit shown using the longer bolts to the Thermostat housing is for their LT1 kit, not an LT4.
I needed the larger volume of their 0.5L CCR and the full recirculating with -10AN drainback feature. I have now created a mounting bracket for the Improved Racing CCR that can be adapted to other designs, I just do not like them. I bought both the MM and the Elite to try out to see which one worked best, which might be great for drag racing but not well received for road racing. I ended up sticking with the two Evil Energy ones for their cheap $30ea Amazon price.
The Improved design with the drain to the OEM LT4 crankcase will be completed in a few weeks as I have other obligations to wrap up at the moment. See the photos below and LMK if anyone wants a bracket to mount theirs.
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