Re: 72 blazer ls swap
 

I also tried the transfer case side mount but it is was off. Keegan yours looks like it is taller. I have pictures of what mine measures if anyone has one that they can verify if this is the wrong mount.

Re: 72 blazer ls swap
 

Thanks...much appreciated...!
I think I have a TC mount from a '71 if I can find it....I will measure it. I'm using a NP241 TC so I won't need it.

Re: 72 blazer ls swap
 

Are you planning on cutting the filler neck?

Smitty

Re: 72 blazer ls swap
 

To be honest I haven't thought that far. I was hoping the factory hose would connect to the tank. Maybe Keegan can tell someone how he did it.

Re: 72 blazer ls swap
 

If you mounted the tank just to the bottom of the frame, I think you are going to have issues with the neck hitting the body floor unless you put spacers in on the body mounts. I put in a 2 1/4 drop on mine so the neck clears the body. Once I finish mocking it up I will post on my build. Some people cut their filler necks on the tank to make up for it. Old tank and new one has a different neck size also.

Smitty

Re: 72 blazer ls swap
 

Yea I would say yours is short

Re: 72 blazer ls swap
 

Correct - I sandwiched my tank in so it would go any further "up" or that would have been the case. I also ended up putting some brackets between the two crossmembers to aid this even more. They run the same way as the frame. For the filler hose, I just double hose clamped the hell out of both ends. Someone showed me a link to some flared hoses at one time but I don't have it anymore.

Re: 72 blazer ls swap
 

OK I know it's been awhile since I've posted. I now have the brakes plumbed in, axles painted, brakes rebuilt and the fuel system roughed in.

Fuel system:
87 blazer tank and sending unit
Acdelco ep381 fuel pump with sock (can be ordered from a 95 s10)
Dorman 3/8" poly lines and connectors
Dorman 5/16" poly lines and connectors
Tanks fuel filter FF-10 (summit TNK-FF-10)
Dorman 3/8 and 5/16 steel line

Like most people have done I used the 87 blazer gas tank with the baffles. I showed in an earlier post how I modified the 87 sending unit by cutting off the flare nut, swagging the adapter lines and brazing them together with 45% silver braze. After some paint I installed the Acdelco fuel pump which fits right in the basket. After much searching at the local auto parts store I found summit was the only place I could find a 3/8" in and out fuel filter and it comes with a mounting bracket. Also since this is the first time I've used the poly fuel lines, I wrapped the lines with braided wire loom to help prevent it from rubbing through. As for installing the ends on the poly lines I did not want to purchase the install tool to do 6 fitting so I used the caulk gun method. Do some experimenting with it as I found it necessary to move the flare block a few times to make one fitting.

Re: 72 blazer ls swap
 

Since the frame is almost as far as it can go it was time to disassemble the truck. Once my buddy's lift frees up I will be pulling the body off.

P.s when I bought this true it was advertised as fully restored. I guess restored is a loose term

Re: 72 blazer ls swap
 

How do like those poly lines? I'll definitely use them again.

Re: 72 blazer ls swap
 

I like them, they are very quick and easy to install! Plus the fact that they will never rust out. I was a little worried about them rubbing through but hopefully the wire loom will eliminate that issue. Thanks for the suggestion

Re: 72 blazer ls swap
 

For what it's worth. For extra safety, I also tie wrapped the quick disconnects on the feed and return lines at the engine's fuel rail. I din't want to rely solely on the plastic clip to hold the line on, because it if should ever pop off with the engine running it could cause a fire. Just peace of mind IMO.

Re: 72 blazer ls swap
 

I ran the poly line in my LS Wagoneer swap. You are correct to secure the ends, They will not take any dangling load off the fuel rail. In a rush to get it on the road I did not secure the fuel line to the fire wall maybe 18-24 inches and it popped off maybe 18-24 inches. luckily no fire. I went AN fittings from the fuel rail to the filter Then ploy to the tank. As fair as the filter goes The C5 vett filters have a built in regulator witch makes life easier running one one line to the motor.

Re: 72 blazer ls swap
 

Last Wednesday I drove the blazer over to my buddies house and took the the body off the fame. After a week of scraping all the undercoating and grease off the bottom of the truck and to my surprise no rust in the floor boards, just the rocker boxes. I painted the bottom with por 15 for protection.. After stripping the firewall I learned how to paint with single stage paint. I think it turned out pretty nice. Put the body on the new frame today but stI'll needs to be bolted down. As Smitty and Keegan said I did have to space the gas tank down. I found a piece of 1" square stock aluminum and installed it as a spacer. I tried to picture it before I set the body fully down. Sits a little high but I think it will look good with the top off. I may need new taller garage doors now.

Re: 72 blazer ls swap
 

Well I figure it's about time I update this build. After having a busy spring the blazer did not get done by my estimated time of memorial day but I did have it running by the 4th of July.

So because of time I opted for a wiring harness from bp automotive. This harness is layed out very nice with all wires labeled. The only thing I would suggest is calling to place the order instead of doing it online. I ended up with the wrong injector connectors due to not knowing it was a flex fuel motor. I ran the harness through the firewall behind the passenger side fuel rail and made a bracket (shown) that allowed me to mount the computer and fuse panel right under the glove box.

As for the throttle cable, I used the one off the suburban and it fits great. You will barely have to ream the hole in the firewall and then just make a slot in the gas peddle for the cable to slide into it. I also used the lokar shifter linkage which took a lot less time to install than expected.

I reused the stock radiator that was in the blazer and uses the radiator hoses off the suburban. I trimmed a few inches off the lower one. Also I drilled and tapped the water pump to connect the steam ports to.. As for fans I bought a 2004 grand cherokee fan and put it into the stock shroud. Note that the 2000 to 2003 are single speed and the 2004 is a 2 speed motor. I have yet to have it bring on high speed.

The cold air intake was a part I found at a swap meet. I believe there's a part number on it if anyone's wants me to lookeep but I know it was for a carb setup. Then just a filter and boots from summit.

Re: 72 blazer ls swap
 

Sorry not sure why the one picture is upside-down . New carpet was installed along with some insulation

Re: 72 blazer ls swap
 

Now with the top off the new softtopper was fitted. It's 90% done at this point but I think inner fenders are optional lol. Once I get it cleaned up I'll take some better pictures.

Re: 72 blazer ls swap
 

Good work brother!

Smitty

Re: 72 blazer ls swap
 

Did you install the DD engine crossmember forward to accommodate the overdrive? I ask because I am installing a 4l80e with an ls3 and definitely have to come forward with mine to keep the tcase in the stock position.

Re: 72 blazer ls swap
 

Ya the engine has to move forward due to the transmission being longer I believe. I did a few mockups with mounting the t-case where it belongs to see where I needed to drill for the new crossmember. I can take a measurement if you would like, just let me know.

Re: 72 blazer ls swap
 

A measurement would be great. Did you simply slide the engine forward on the mounts or did you slide the crossmember forward? Since I’m going with a 4l80e/np205 in mine I am probably going to be moving the engine another 3-4” forward compared to the 4l60. I went this route for the reputation the 4l80 has to hold up to higher horsepower since I’m using an ls3 for my build. What did you go with for headers/manifolds? Any pics of the setup?

Re: 72 blazer ls swap
 

That is awesome. Love the setup and wheels

Re: 72 blazer ls swap
 

Do you have any photos of what you did with your brake lines?

Re: 72 blazer ls swap
 

Running adapters on them new style wheels?