While changing my fuel injectors, I also changed my spark plugs. The #8 plug is in a difficult spot to say the least. Here's how I changed mine. First, I used a spark plug socket (with rubber holder inside) with a 3" 3/8 extension bar. Work it into #8 hole, the end of the extension should be visible. Attach a 3/8 universal joint, then another 3/8 extension bar (I used a 12"), and a socket wrench to the end of that. Should look like this
http://www.zr1.net/forum/picture.php...pictureid=1604
Loosen the spark plug until it is free. Now take apart everything up to the 3" extension bar. It won't come out with the spark plug attached so, pull the 3/8 extension out alittle bit (you might need needle nose to do this)and grab it with a pair of channel locks. With a screw driver push the socket down, while pulling up with channels, and separate the socket from the extension.
http://www.zr1.net/forum/picture.php...pictureid=1605
http://www.zr1.net/forum/picture.php...pictureid=1606
Now to get the socket out. I took apart one of those telescoping mirrors with magnet, by unscrewing the magnet.
http://www.zr1.net/forum/picture.php...pictureid=1607
Tape the magnet onto a piece of wire. Make sure you wrap it tight, you don't want to lose your magnet down there. I used electrical tape and put a couple wraps around the bottom for good measure. Don't worry it works through the tape. I tested it on a heavy socket to be sure.
http://www.zr1.net/forum/picture.php...pictureid=1608
Fish the socket out of the hole.
http://www.zr1.net/forum/picture.php...pictureid=1609
Get your new spark plug ready. This is what the assembly looks like together.
http://www.zr1.net/forum/picture.php...pictureid=1610
First, drop the new plug down the hole. Then work the 3" extension bar into the socket, attach the universal, and hand start the new plug. Attach the 12" extension bar with a torque wrench on the end. Tighten 19 ft/lbs (according the LT-5 supplement manual).
http://www.zr1.net/forum/picture.php...pictureid=1611
Once it's tight, gently turn the wrench CCW to help loosen the socket from the plug, don't loosen the plug from the block. Disassemble the socket and long extension. Now work the rest of the assembly free of the plug. Once it's free, take off the universal joint and remove 3" extension and socket. Your done, easy right

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