brake Posted October 30, 2011 Report Share Posted October 30, 2011 Are all 3100 and 3400 (ohv) motors a direct replacement for the 3100 in my 96 Grand Prix SE? Or only certain years/models/platforms? Impalas and Montana vans are everywhere. It knocks like a Jehovah and it hasn't sprung an intake manifold gasket yet at 254k kilometers...I'm waiting for it. It would be much easier for me to get a used motor and do all of the gaskets while it's on a stand and then just swap it in, assuming everything would be a direct fit and I wouldn't need to buy anything aside from new motor mounts. I found a '95 3100 with transmission (out of an Oldsmobile) for $200. Mileage is much lower than mine. Is that a direct fit? Quote Link to comment Share on other sites More sharing options...
Mater Posted October 30, 2011 Report Share Posted October 30, 2011 any should work. just switch over your injector harness and front accesory drive if it is diffrent. N-bodies had a diffrent belt routing then then W and U bodies Quote Link to comment Share on other sites More sharing options...
urbex Posted October 30, 2011 Report Share Posted October 30, 2011 Ha ha...knocks like a Jehovah... That's funny!!! Quote Link to comment Share on other sites More sharing options...
brake Posted October 30, 2011 Author Report Share Posted October 30, 2011 Ha ha...knocks like a Jehovah... That's funny!!! it runs decently enough but it's the loudest piston slap i've heard on a motor that actually functions. i don't want to do the top end gaskets on a motor with a shitty bottom end thanks guys! any other bits of advice would be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
brake Posted October 31, 2011 Author Report Share Posted October 31, 2011 (edited) The plot thickens. I was offered a complete van w/ a 3400 in it that has recently (10k ago) had the top end rebuilt with new gaskets and had the heads reconditioned/acid dipped/magnafluxed. 400 bucks for the whole van, it's a 98 venture. going to see if he'll sell me the motor by itself because i really don't have a spot for the van...my vic and grand prix take up the driveway. Edited October 31, 2011 by brake Quote Link to comment Share on other sites More sharing options...
Mater Posted October 31, 2011 Report Share Posted October 31, 2011 (edited) if you get the whole van though you could re-coupe almost all the money just from scrapping it pulling a engine from a U-body is pretty tough it has to be dropped out the bottom unless you get a little ambitious with a saws-all it was not fun when i had to replace the engine in my old race wagon (said in a german accent) 2003 Oldsmobile Silhouette GLS it had 3500 heads/LIM and ported 3400 intake Edited October 31, 2011 by Mater Quote Link to comment Share on other sites More sharing options...
brake Posted October 31, 2011 Author Report Share Posted October 31, 2011 (edited) hmm, good to know. I don't even really have room for the van itself so needing to drop it out of the bottom would make this almost impossible. I am always up for a challenge but I don't think I have the necessary gear for this kind of thing. Edited November 1, 2011 by brake Quote Link to comment Share on other sites More sharing options...
GOT2B GM Posted November 1, 2011 Report Share Posted November 1, 2011 As soon as you say you can't , you won't be able to.... Rip into it!! Quote Link to comment Share on other sites More sharing options...
ptcfast2 Posted November 1, 2011 Report Share Posted November 1, 2011 I can hook you up with a new GM crate 3.1 LG8 V6 but it's probably a bit costly for ya. Got $2,150? Quote Link to comment Share on other sites More sharing options...
Psych0matt Posted November 1, 2011 Report Share Posted November 1, 2011 I can hook you up with a new GM crate 3.1 LG8 V6 but it's probably a bit costly for ya. Got $2,150? I don't know that anyone would pay that insane amount of money for a 20 year old slow (albeit reliable) engine Quote Link to comment Share on other sites More sharing options...
ptcfast2 Posted November 1, 2011 Report Share Posted November 1, 2011 I don't know that anyone would pay that insane amount of money for a 20 year old slow (albeit reliable) engine LG8 was introduced in 2000, so it's only 11 years old! The one I'm talking about is a 2003 model (with the LG8 GM did tons of yearly updates between each year to improve the engine, 2003 and 2005 were big upgrade years). So it's only almost 8 years old. But it's a new turn key crate with 0 miles so the price kinda explains itself (its cheaper when compared to what they originally went for a few years back) It's not that bad a price if you want a newer/recent engine that will easily go 250,000+ miles with proper maintenance. Never been a fan of junkyard/used pulled motors honestly, rather buy something rebuilt or new - it's worth the money sometimes (like if you put a bunch of money into the car and plan on keeping it for years, buy new else just get a used one with lowish miles). Quote Link to comment Share on other sites More sharing options...
brake Posted November 1, 2011 Author Report Share Posted November 1, 2011 I'm realizing how easy it would be to just hack the front end off of the van and pull the motor straight out. If I can find a place to keep the van for a few days I'll do it. Quote Link to comment Share on other sites More sharing options...
Psych0matt Posted November 1, 2011 Report Share Posted November 1, 2011 so it's not a 3.1 (mpfi) Also I was half asleep and just rolled out of bed Quote Link to comment Share on other sites More sharing options...
Mater Posted November 1, 2011 Report Share Posted November 1, 2011 rent a storage unit for a week or so. some even have plug out lets Quote Link to comment Share on other sites More sharing options...
brake Posted November 5, 2011 Author Report Share Posted November 5, 2011 What do you guys figure I will need to use from my 3100? Sensors, actuators etc....also, will a 3400 car computer be needed for proper fuel metering? Quote Link to comment Share on other sites More sharing options...
ptcfast2 Posted November 5, 2011 Report Share Posted November 5, 2011 What do you guys figure I will need to use from my 3100? Sensors, actuators etc....also, will a 3400 car computer be needed for proper fuel metering? Read this - should help tons with this swap: http://crzyz28.sytes.net/images/banners/portal/gm_v6/31-to-34-swap-guide.pdf Quote Link to comment Share on other sites More sharing options...
brake Posted November 5, 2011 Author Report Share Posted November 5, 2011 hey, look at that! thanks. Quote Link to comment Share on other sites More sharing options...
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