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Do a google search, there are numerous ways to accomplish this, it's been done for years. Another method is using another water crossover on the rear of the head, there are several water crossovers for these motors based on years. EGT's are more prevalent in turbo's....that's a different topic...

Rear cooling kits are nothing new, these are already for sale from other aftermarket Hummer dealers as well as Diesel suppliers. It's nothing new to take the 2 rear water Jacket plates and drill and tap them, install small cooling lines tied into the rest of the cooling system. You will need to...