Conversions & Swaps LSX Engines in Non-LSX Vehicles
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The G-Body Swap Thread

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Old 12-13-2015, 10:15 PM
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whew, read this whole thread in one night, was making a list summarizing what I need for a swap, helping with a 1980 El Camino build.

Seems the elk needs the 1992-1994 Roadmaster tank, factory sender with upgraded pump?
Old 12-15-2015, 10:22 AM
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Why not get an 85-87 elco tank, direct bolt in?
Old 12-15-2015, 08:52 PM
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Originally Posted by HILROD
Why not get an 85-87 elco tank, direct bolt in?
Tank is the easy part, but the 4.3 injected sender seems impossible to find. The Wagon seems to have the other problem, the sender is made, but the tank is off the market, but I can at least find a few of those in a salvage yard. My understanding is it is a bolt in, but the filler neck is a smaller diameter than the elk and will need some fabrication there.

But if you have any ideas for the eco tank instead, I'd love to go that way! The universal TPI conversion setups are about as expensive as a tank.
Old 12-16-2015, 07:44 PM
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Great news to Elco owners Ls swappers fuel injection sending unit
http://www.dixierestorationdepot.com...0219&d=880&p=2
Old 12-16-2015, 07:46 PM
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2002 5.3/4L60E 1985 El Camino..,,
Old 12-17-2015, 12:36 AM
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Originally Posted by toyin
Not sure what the deal is with the drivers side but it don't line up for ****! I don't know if they're supposed to line up like this but i wouldn't think so. I've seen a couple pictures of the Spohn mounts but they are always the passengers side and never the drivers side.
They are not a true bolt in for the G body only for the third generation Camaro, they just happen to work in the g body. A little false advertisement I'd say.... Found this out the hard way like you. I did just buy the UMI ones for mine so we'll see if they are a true bolt in like they say.
Old 12-18-2015, 04:40 PM
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well still waiting for my power steering set up i got the engine (2010 LS3) mounted to a th350 trans that was in the car from before the swap. I used the hooker/holley motor mounts(part#12643HKR) that mate to the stock clam shells which the instructions tell you to move rearward to the next mount holes in frame (picture shows the oem mount spot) im curious if any of you have used these mounts from holley and if this looks to be the amount of room you have between the rear of the block/heads and your firewall (pic shows the amount of room i have) seems too tight. trans dip stick tube has no damn room to go where it normally does. that aluminum plate covering my heater box opening is about 1/4 inch thick as well
seems to me the original clamshell mount holes would be better my oil pan is miles away from the frame so theres room there and tonnes of room up front for fans /rad/ etc so..... let me know people thanks
Attached Thumbnails The G-Body Swap Thread-img_4240.jpg   The G-Body Swap Thread-img_4241.jpg   The G-Body Swap Thread-img_4242.jpg   The G-Body Swap Thread-img_4243.jpg  
Old 12-18-2015, 04:53 PM
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also the holley g body ls swap trans crossmember is not even close to lining up with the trans mount bushing on the th350 trans (came out of a 78 monte)
one thing after another with this damn swap haha
Old 12-18-2015, 04:53 PM
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Yes it will be close to the ac/heater box with my 5.3 the power steering pump pully is close to steering gear box. I used a smaller pully to clear. With new motor mounts u shouldn't have any problems
Old 12-18-2015, 05:12 PM
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Talk to toddoky and see if your in the right holes. On my cutlass I had 7/8 between head and firewall. What ps pump/ alt are you using?
Old 12-18-2015, 05:40 PM
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Originally Posted by G-BODY-JAMES
well still waiting for my power steering set up i got the engine (2010 LS3) mounted to a th350 trans that was in the car from before the swap. I used the hooker/holley motor mounts(part#12643HKR) that mate to the stock clam shells which the instructions tell you to move rearward to the next mount holes in frame (picture shows the oem mount spot) im curious if any of you have used these mounts from holley and if this looks to be the amount of room you have between the rear of the block/heads and your firewall (pic shows the amount of room i have) seems too tight. trans dip stick tube has no damn room to go where it normally does. that aluminum plate covering my heater box opening is about 1/4 inch thick as well
seems to me the original clamshell mount holes would be better my oil pan is miles away from the frame so theres room there and tonnes of room up front for fans /rad/ etc so..... let me know people thanks
The engine inclination angle has a profound impact on the clearance between the cylinder heads and the firewall; what crossmember are you using to support your TH350? That could be the cause of your problem and may require you to use shims between the crossmember and trans mount. You'll want to investigate that in conjunction with checking your U-joint working angles. As a quick-check, you can eyeball the relative angle difference between the bottom surface of the trans pan and frame to get an idea of where you're at...if the bottom of the trans pan is level with the bottom of the frame, or angled down in the rear compared to it, then you will have the clearance issues you are describing and your U-joint operating angles will be non-optimized.
Old 12-18-2015, 05:42 PM
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Originally Posted by G-BODY-JAMES
also the holley g body ls swap trans crossmember is not even close to lining up with the trans mount bushing on the th350 trans (came out of a 78 monte)
one thing after another with this damn swap haha
The Hooker G-body crossmember was not designed to work with a TH350 or 700R4 transmission.
Old 12-18-2015, 07:12 PM
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You could go with a 4l80. It will work with crossmember , has overdrive and will handle a lot more torque than a t 350.
Old 12-19-2015, 10:50 AM
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Originally Posted by Toddoky
The engine inclination angle has a profound impact on the clearance between the cylinder heads and the firewall; what crossmember are you using to support your TH350? That could be the cause of your problem and may require you to use shims between the crossmember and trans mount. You'll want to investigate that in conjunction with checking your U-joint working angles. As a quick-check, you can eyeball the relative angle difference between the bottom surface of the trans pan and frame to get an idea of where you're at...if the bottom of the trans pan is level with the bottom of the frame, or angled down in the rear compared to it, then you will have the clearance issues you are describing and your U-joint operating angles will be non-optimized.
ok yes the angle is not set yet as the holley cross member (ls swap g body) is not attached yet it doesnt mention a th350 anywhere in the instructions but it does mention th400 and 200r4 and im guessing the th350 sits in the same catagory as them....... so i have to buy an instalation kit (12650HKR) to mate the trans with the crossmember i believe... im finding that with the holley ls swap stuff there is an instalation kit with everything that nobody mentions and also i jacked the trans as high as it would go it was touching the body and that still wouldnt leave enough room for the trans dip stick. it seemed like at least

Last edited by G-BODY-JAMES; 12-19-2015 at 10:56 AM.
Old 12-19-2015, 10:54 AM
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just read the other message haha so there is no way this holley crossmember will work with the th350??????

and i plan on running a built th400 but i cant afford it right now so was just going to use the 350 to get the thing moving the harness ive had made by psi is set up for the th400 not a 480 or 460le so.....
Old 12-19-2015, 11:03 AM
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Originally Posted by jimmyg
Talk to toddoky and see if your in the right holes. On my cutlass I had 7/8 between head and firewall. What ps pump/ alt are you using?
i ended up with a 2011 silverado 5.3L 145 amp 2 pin alternator it fit the bracket mint and has the 2 pin plug i needed old alternator was 150 amp tho dont know if this will matter i had to get the 2 pin alt as my PSI harness was created for the LS3 from the 2010 camaro as i was led to believe id use everything from that engine and now realizing this in not the case at all as none of the holley stuff was designed in any way to work with the ls3 accesories out of a doner camaro. well the ps and alt anyways
so i broke down and ordered the holley ps pump resivoir kit and idler pully as they were cheaper than an 06 vette by quite a bit and they are designed for the bracket i hope they work!!! probably need another installation kit for them haha
Old 12-19-2015, 11:10 AM
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at least it looks cool haha
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Old 12-19-2015, 12:09 PM
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Originally Posted by G-BODY-JAMES
just read the other message haha so there is no way this holley crossmember will work with the th350??????

and i plan on running a built th400 but i cant afford it right now so was just going to use the 350 to get the thing moving the harness ive had made by psi is set up for the th400 not a 480 or 460le so.....
The Hooker crossmember will not work with a TH350 in any configuration; the mount location on the TH350 is more than 5" further forward than that of the mount location on a TH400 or 2004R, which are the same as a T56 (within 3/16"). What year/model is your car? The 78-up A-body/ Malbu cars have proven to have tighter clearances at the firewall than the G-body designated cars for some unexplained reason.

Last edited by user 4737373; 12-19-2015 at 12:17 PM.
Old 12-19-2015, 03:59 PM
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Originally Posted by Toddoky
The Hooker crossmember will not work with a TH350 in any configuration; the mount location on the TH350 is more than 5" further forward than that of the mount location on a TH400 or 2004R, which are the same as a T56 (within 3/16"). What year/model is your car? The 78-up A-body/ Malbu cars have proven to have tighter clearances at the firewall than the G-body designated cars for some unexplained reason.
Will the Hooker crossmember part #12644HKR work with the 4L60 and 4L65?
Old 12-19-2015, 07:29 PM
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Originally Posted by upflying
Will the Hooker crossmember part #12644HKR work with the 4L60 and 4L65?
Yes, but it requires the use of an additional cantilever bracket that attaches to the center beam of the crossmember...it's shown on the Holley website under the G-body swap system application.


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