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I am still looking for you, I have been all over the 86 FSM and see many images but they have yet to give torque / tightening sequence. still looking for runner to intake torque.
I found this image which should be the one to give torque / sequence but they failed to do so on it and the pages prior to and after it.
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Thanks for the link. Do the tubes and upper plenum get tightened all together in one operation, gaskets dry? Why would GM leave this out of the FSM, crazy.
I am getting ready to do it in the spring and it will be the biggest job I will have undertaken.
Come to think of it everything I have seen and read has the runners pre mounted before intsalling plenum. The removal process was always plenum off first so I would think plenum on last after tightening the runners.
As for the gaskets I have zero experience with the plenum, I would say follow the gasket maker if know one else with more experience chimes in.
One point made on a website was, "just don't break it, it is just air coming through the plenum, no fuel so you would want it sealed but it is not fuel or anything."
As I recall it's much easier to put the runners loosely on the lower plenum so that you can move them around a little bit when you install the upper plenum and gaskets.
I recently did my injectors this fall and gaskets go on dry. Make sure the mating surfaces are spotless with NO old gasket material. Start every torx bolt, then snug them in a center out pattern.
As I recall it's much easier to put the runners loosely on the lower plenum so that you can move them around a little bit when you install the upper plenum and gaskets.
This is what I did when I reinstalled the intake on my 91. Dry gaskets. Crossing pattern tightening. Been over a year now.
