Everyone thinks changing plugs is easy on a hemi. Well, seven of the eight plugs are easy to replace. Trying to access plug #7 under the power brake booster is always a challenge. Chrysler actually made the #7 plug boot different than the other 7 boots. All but #7 use a bakelite insulator to locate the terminal on the end of the plug. The #7 boot, on the other hand, has a flexible rubber boot designed to bend so you can get it out without having to unbolt your entire power brake booster from the firewall. But if your car has any miles on it, that rubber boot is nowhere near flexible anymore.
Over the years I have figured out the exact combination of adapters and extensions to loosen the plug and then extract it from the tube in the valve cover. This can be quite entertaining if you are ever in the neighborhood of someone who has never done it before. It's kind of like watching a group of officers attack one of those "Leadership Assessment Obstacle Courses" in the military - you know the ones where you are tasked with getting over a 30 foot trench filled with radioactive hot lava and they give you 3 tooothpicks, a 55 gallon drum, a paper cup and a Playboy magazine, and 28 minutes to do it in.
Officer Candidates, here is your challenge: #7 spark plug has one inch of clearance between the brake booster and the valve cover. You have to successfully remove a 4-inch spark plug, a 7-inch spark plug terminal and a 3-inch spark plug socket from the hole and reinstall a new spark plug without breaking it. You have 28 minutes.....
