bobotech Posted October 17, 2011 Report Share Posted October 17, 2011 in the process of trying to repair a problematic 90 base Lumina with the 3.1, we broke the water inlet fitting on the bottom of the intake manifold below the water neck area. Turns out to get a new one of those fittings, it is 80 dollars from the chevy dealer with a 2 week wait time. So we went back to the pull and save junkyard and pulled a intake manifold off of a 93 engine and cleaned it all up and went to put it on the 90 engine. It won't seat all the way on the right side of the engine when viewing it from the front. Are we just being stupid or something or is the 93 just not compatible with the 90 block/heads? Quote Link to comment Share on other sites More sharing options...
slick Posted October 17, 2011 Report Share Posted October 17, 2011 IIRC, yes. However, I do not remember specifics. You need a 91-93 manifold. Quote Link to comment Share on other sites More sharing options...
White93z34 Posted October 17, 2011 Report Share Posted October 17, 2011 the lower should fit just the same you will however run into issues getting the intake plenum on the bolt holes are different. Quote Link to comment Share on other sites More sharing options...
bobotech Posted October 18, 2011 Author Report Share Posted October 18, 2011 Well I'm not worried about the upper penum, we can get that cheap enough from the engine we pulled the lower intake off of. But the first poster said that it was different so I'm confused now. Quote Link to comment Share on other sites More sharing options...
bobotech Posted October 20, 2011 Author Report Share Posted October 20, 2011 Does anyone have any definite yes or no answer as to whether the 89-90 3.1 vin T manifolds are different than the 91-up 3.1 manifolds? I'm concerned with the lower manifold bolting TO the heads/block. If the upper plenum is different, than that is no big deal at all, just grab another 10 dollar plenum at the junkyard. I"m just extremely concerned that the the 93 manifold that we got will bolt in place on top of the 90 block that is in the car. Thanks. Quote Link to comment Share on other sites More sharing options...
slick Posted October 21, 2011 Report Share Posted October 21, 2011 Get the correct upper and lower. Quote Link to comment Share on other sites More sharing options...
bobotech Posted October 24, 2011 Author Report Share Posted October 24, 2011 Well we went back to the junkyard and got a different lower manifold. Got one off of a 90 Caviler and it fits perfectly. So at this point, we are good to go with finishing up reassembly. Quote Link to comment Share on other sites More sharing options...
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