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Best access to change the rear bank is through the right side of the engine under the intake manifold. You'll need a small assortment of hand tools to find the right combination of extensions to get the rear bank out. It's a pain in the ass, and if you've never done it before plan on taking your time and not needing your car for several hours.
On the right side of the intake manifold there is a group of brown wires bolted down with a 12mm bolt. Disconnect the bolt so you can move the wires to the side for access. You'll also see a black hose about an inch in diameter going from a port in the top of the valve cover to a nipple on the bottom side of the intake manifold. Slide it off that nipple and move it to the side, and you should have a shot at getting back there to the spark plugs. Reach back, pop the plug boots off and work them out. Now you'll have to screw around with your tools to find the best way to loosen the plugs. What I always did was put a 3" extension on a spark plug socket and place it in the spark plug tube, put a ratchet on the extension, loosen the plug, remove the extension and back the plug out by hand.
Like I said, it's a pain in the ass, but with a little time and patience, you can get it done. Post if you need help.
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