There are some good writeups on this an I think I have some instructions I downloaded. Be sure to ask the forum when you are about to do this job so we can share the info with you.

For me, I took a full weekend to do it. There is a lot to get out of the way first before you can even remove the intake. There was also a single nut associated with the power steering bracket I couldn't find. LOL Overall it wasn't so much difficult but rather annoying.

You will likely need a 3/8" drive torque wrench too.

When I did mine I took the opportunity to upgrade the fuel injector system from the poppet style nozzles to the port valved nozzles.

 

Thank you. If you still have those instructions I would greatly appreciate it if you could send them to me

 

I've attached some of what I've saved and scanned along with a this link:
https://blazerforum.com/forum/tech-a...-4-3-v6-46168/

The scans from the manual are from my 99 Service Manual. A word of caution about the service manual instructions; I think they were written as if the engine had been removed from the vehicle. Be sure to read over all of them, especially the one "How To Replace Intake Manifold Gaskets On A GMC Jimmy 4_O.pdf".

Note that according to the file "LowerIntake 2001 Lesmyer Blazerforum.pdf" the upper intake plenum doesn't have to be removed if you are only replacing the lower intake manifold gaskets.

As I mentioned above, use the FelPro gaskets with the metal frame. These come part of a gasket kit: MS 98002 T (https://www.oreillyauto.com/detail/c.../fel0/ms98002t). This is a good opportunity to replace all the gaskets on the top side of the motor so I used the full kit. I wish I had used some threaded rods to act as guide rods for placing the intake in place. You might be able to do this by cutting off the heads of the old bolts if you replace them. I wasn't happy with my RTV job on the front and rear rails and I wish I had purchased my own RTV to use instead of using the small amount supplied with the gasket kit.

Also, this took me a whole weekend in my garage. If this had been on my 68 Mustang, it would have taken only an afternoon. The difference is how crowded the Blazer engine compartment is and how much stuff you have to get out of the way first.

Be sure to ask questions and report back on how you get along.

 

i would suggest a crows foot for those fuel lines next to the firewall, maybe 5/8"?...if you round those off with an openend,,,you might not be happy...never mind that PITA nut on the bottom of the ac compressor...i tried every wrench i own,on that one..LOL