Little tip here before you strip the screw heads and cause all sorts of mayhem.
Soak the manifold bolts with some good penetrating oil such as Seafoam deep Creep or PB Blaster before going to bed the night before your ready to dig in. Not just a little squirt..get them SOAKED real good. In fact, do it soon as you get home and get the carbs off and again before crashing. And again when you are getting your tools ready...see where I am going with this??? Lay a a rag on the tranny case to catch the slop.
Point is to get as much soaked into the threads as is possible. Use an impact driver and get a good solid whack on the driver the very first time. Press in on the driver so the bit is seated and held real firm..line up the hammer..and whack the thing pretty good. Be CERTAIN the driver is going in the OFF direction before smacking the bolts in even tighter too. Once the bolts break loose some will turn real easy and some will give some resistance. The ones that want to be stiffer hit again with oil and work the bolts back and forth to further loosen the cruds grip in the threads.
Another good way to get a good area to whack the impact is to take out the battery and use all your extentions and go in thru the battery box to get the bit lined up. the driver handle will be out in the open for a good lined up shot at it.someone had actually posted pics of this setup long ago but I dontrecall who it was or what thread was.
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