Another Obs Ls Swap

Hey guys been a long time lurker and collecting parts at the same time. So I will start off by giving a little backround info of My truck. The truck is a 1989 gmc sierra z71 stepside, that a guy in our marina had since 1995 I had always bugged him to sell me the truck but he kept saying he would never sell it. It then turned out to be a work truck and then he needed money so in 2008 I bought the truck from him for $500 to be used as a mud truck. The truck made it to one mud run and I decided i needed a project after that. So it all began with tearing the cab, box and everything off the frame. I then had all the suspension and frame redone and powder coated red. Every nut, bolt and bushing has since been replaced. the next step was to have the body re-done. it turned out that the cab needed new rockers and cab corners while in the process i cleaned the inside of the cab and had it rhino lined to seal everything up and mounted seat out of a 2006 denlai. so i replaced those and i also added new fenders as well. then for the motor i had just a basic 350 roller with some slight bolt ons and some mild head work. alot of my friends now have the nbs trucks and started doing some 6.0l swaps so i am not going to lie i jumped on the band wagon when i found a 2004 lq9 out of a silverado ss with 100 000km and 4l65e and awd transfer case for $800. the one downfall was the wiring had been cut and there was no computer. that was not a big issue since a guy that runs a speed shop around here had a carb set up on the same motor. i have stripped the motor down completely por15'd the block, bought the edelbrock 7118 intake and msd box and a 750 holley double pumper carb. I have bought a areomotive by pass regulator so i can still run my factory intank fuel pump since it is brand new and i have gone with the pace setter long tube headers. i have already pulled my transmission and driveline and disconneccted all the wiring and hoses going to my tbi motor. the only thing left is to pull the tbi motor out. i know you guys like pictures so i will post some of the truck. dont mind the dust i forgot to put the cover on it over the winter.
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well i guess you can only have so many pictures so here are some more

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Wow, what a transformation. Truck looks real good. Good luck with the swap.

Nice gauge cluster and I like the red.

Hey man great job with the truck, It looks killer! Just wondering what kind of side mirrors you have on it I've never seen those before.

thanks guys some love the red and some hate it. as to the gauge cluster that was a royal pain in my ass. finding all the wires from the stock wiring harness which did what and then running power and grounds for every light and gauge in there. the mirrors were a bad idea i found them on ebay and from the pictures they looked to be a decent size but when they arrived they were only 4". the other news is i have the motor out and sold it for 900 to another guy with a tbi. but i came to a complete hault last night when i went to put the ls into the truck. i bought the transdapt 4572 motor mount apapters and measured the centre hole on that and the centre hole on the tbi from the tranny housing face and the transdapt mounts move the motor back 1.5 so 14.5" from the tranny housing and the old tbi is right around 16" so what motor mounts should i get and what are the part numbers. the reason i went with the 4572 was because it was suppose to keep the motor in the stock location.

Dirty dingo is what im getting... they're adjustable so u can stick the ls in the original place. (And use the original frame brackets) Alot of ppl on this forum and others have used them and they're specifically designed for this kind of swap!! Just go to dirtydingo.com and use the motor mount kit for 88-98 4wd trucks and blazers.

thanks i ordered the dirty dingo mounts now i have to wait 6-10 business days plus 40$ shipping. god i hate living in canada some days.

Yeah that's gotta suck sometimes!! its nice down in va tho... 1-2 business days for my motor and tranny to ship from Ohio!!! :D but 3-5 for most other parts!

so my powder coated dd mounts showed up. they look really good. have any of you guys that have done the swap tried putting the motor in with the long tubes on or am i crazy for thinking of putting the headers on first? i want to have as much on the motor as possible but i am an hours away from my truck so i cant do any quick measurements.

so last night i finially got a little bit of time to work on my truck. i got to pulling the old transdapt mounts and switched them out for the dirty dingos. i must say those mounts are really nice to work with especialy with new hardware. i ended up pulling the flywheel of the 6.0l and the flywheel from my old tbi motor. i lined up the converter to the 6.0l flywheel and the openings were a little of. so i rotated the flywheel 45degrees and re drilled the holes to 9/16 to match the 700 torque convertor. i bolted the flywheel back on and installed the hughes performance crank spacer. next step was to obvioulsy pull the truck up and throw the motor in. so i figure most guys aren't interested in doing the reading so here are some pictures. although i do have one question for you guys that have used the dirty dingo mounts did you place your tranny and crossmember in and pull the motor back to line it up or did you push the motor forward hook the tranny up to the motor and full the cross member and tranny back as one piece then torque the motor mounts down?
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I had my motor as far forward as possible so it was easy to set in, and easy to hook the tranny to it. Then once I had the 2 connected i used 2 ratchet straps tied to the motor to suck it back so the tranny would line up with the holes. Then just tightened the motor mounts down

thanks for the advise i will give that a try when i go to work on the truck. i ended up having to drill and tap the holes bigger in the heads. one for my mechanical temp gauge and the second was for my electric fan temp switch. how bad of an idea is it to plug the steam ports. i ended up breaking the one arm off on the front that usualy runs to the tb. so there was another motor out there that had the individual blocks so i capped them off for the time being so i could get it running till i could find a replacement. i also decided to use my original tbi motor alternator. since it was rebuilt and beefed up to 160amps also i would not have to change any of the wiring and i already had to but a resistor in for the system to charge. the only issue was with the left side mount off the alternator i had to make a .200 shim to make it sit parallel with the other side which bolted in directly.

a little update. i have mounted the transmission to the motor bolted in the crossmember and bolted the transfer case up to the transmission. put the pacesetter long tubes on (70-2265). there are 2 slight issues. the first is they just barely touch the drivers side frame rail and 2 using the 700r4 transmission it just slighty touchs one of the ears on the casing. but would be fine if you use a new 4l60e. all fluids have been filled except for coolant. i am still deciding where to mount the fuel pressure regulator. the only thing beside coolant and fuel left to do is hook up the power and ground for the msd box then i should have a video of open headers for you guys :D

Going to be fun once done

Looks good bud let us know how it runs!

not sure where i left off. so the motor is in. all the drive line is in (transmission/transfer case/ drive shafts). i have mounted the fuel pressure regulator to the fire wall since i had the braided stainless lines there for the tbi set up and thats where there was enough room to mount regulator with out modifying my lines. i powered up the msd box for carb setup. just needs a ground and 12v acessory power wire and one wire that powers the tach. then just a couple plugs for a map sensor. crank sensor and cam sensor. the final wire is for ac which the truck does not have so i didnt have to worry about that one. next step was to put on the pace setter headers. they fit relatively well. there was only 2 issues with these headers for me. the first was with running the 700r4 the one header just slightly rubs the transmission housing where the bottom dust cover bolts to. i just used a sawzaw to trim that back a 1/4" the second issue was on the drivers side frame rail the one tube for the header rubs the frame. when the truck goes in to have the exhaust joined the guy is going to heat the tube up a little bit and bend it over for me. so now that everything was hooked up. it was time to start it. i go to turn the key and no fuel pressure. it turns out since i was running the factory fuel pump to supply the pressure regulator. that my original computer needs to see oil pressure to send power to the fuel pump. good thing i didnt cut out any of the original harness. i had to build a t out of aluminum so i could run an original sensor and one for my mechanical gauge. it fired up right away. ill post a couple pics of the headers and second start video its kind of short and needs some serious carb adjustmest but man does it sound mean and got power compaired to that wimpy 5.7
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