I've done my transmission rebuild...head rebuild...so I want to learn about bottom end items now as in reality I know very little...but I am always up for the challenge.

So overall, what parts/work will I need to buy/do to attain ~3.6L?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k