5.3 LS Engine Swap into Ol’ Blue 1971 Chevy Truck Part 7 1


The project that never ends….continues!! This time we install LS Swap Throttle Cable, Spectre Intake, and create a mount for the LS Engine ECM.

In Part 6 we left off with some celebratory beers, after I finally resurrected the 5.3 LS in it’s new (44 year old) home! Now it is time to get everything hooked up so I can finally drive it.

All of the universal throttle cables that I have been finding are $40+ with the Locar brand being 60+. Little expensive for me, so I did some searching around and found a GM part number 15040848 on a forum. Turns out this cable is for a 99-03 V8 Chevy truck and fit perfectly. Found it on GMPartsDirect.com for$22.33 that came out to $35.30 after shipping and handling.

GM 15040848 Throttle Cable

GM 15040848 Throttle Cable

Engine side of the throttle cable that hooks up to the LS throttle body.

Engine side of the throttle cable that hooks up to the LS throttle body.

Fits right into the factory bracket and onto the throttle body.

Fits right into the factory bracket and onto the throttle body.

Pedal side of the LS throttle cable.

Pedal side of the LS throttle cable.

The square hole on the bottom right is where I removed the factory '71 cable from. All I did was take a step bit and drilled it out one step at a time until it was round and the throttle cable snapped into the firewall.

The square hole on the bottom right is where I removed the factory ’71 cable from. All I did was take a step bit and drilled it out one step at a time until it was round and the throttle cable snapped into the firewall.

Had to cut a slit in the '71 throttle pedal, then the cable slid through and the factory GM plastic retainer just clipped right in.

Had to cut a slit in the ’71 throttle pedal big enough for the cable to slide through , then the factory GM plastic retainer just clipped right in.

I was amazed at how stupid easy this was. I had my Dad stand at the front and watch the throttle body while I ran the pedal through the full range of motion. I ended up bending the pedal rod slightly just so I didn't bottom out the throttle plate when full throttle.

I was amazed at how stupid easy this was. I had my Dad stand at the front and watch the throttle body while I ran the pedal through the full range of motion. I ended up bending the pedal rod slightly just so I didn’t bottom out the throttle plate when full throttle.

Next, I went about mounting the LS engine computer. I wanted it in the engine bay, but not mounted to the wheel wells since I don't want to have to move it every time I take the wheel well out.

Next, I went about mounting the LS engine computer. I wanted it in the engine bay, but not mounted to the wheel wells since I don’t want to have to move it every time I take the wheel well out.

After deciding where I wanted it , I cut a piece of cardboard approximately the same size as the computer.

After deciding where I wanted it , I cut a piece of cardboard approximately the same size as the computer.

Then bent up and tacked together a small bracket out of 1/8" x 1" steel. Should still have plenty of room for the headlight connector and wheel well.

Then bent up and tacked together a small bracket out of 1/8″ x 1″ steel. Should still have plenty of room for the headlight connector and wheel well.

Went to the hardware store and acquired some rubber foam weatherstrip. I figured the computer would need some kind of vibration damping.

I figured the computer would need some kind of vibration damping. So I bought some rubber weatherstrip to isolate the computer. Which actually ended up working pretty well.

M-D Building Products 6593 Sponge Rubber Tape, 1/4-by-3/4-Inch-by-10 feet (Closed Cell), Black

now that I know the thickness of the rubber I could start bending and welding brackets (not an exact science).

now that I know the thickness of the rubber I could start bending and welding brackets (not an exact science).

Ta-da, easy bracket done and welded on.

Ta-da, easy bracket done and welded on.

Now, the more complicated bracket that I will be using to bolt the computer in. I used my vice and a hammer to make the bends, then drilled holes and welded nuts on for attachment.

Now, the more complicated bracket that I will be using to bolt the computer in. I used my vice and a hammer to make the bends, then drilled holes and welded nuts on for attachment.

Here you can see the design I came up with has two L shaped brackets at the bottom that cradle the computer. Then I have one strap with two bolts to hold the computer down and in the brackets.

Here you can see the design I came up with has two L shaped brackets at the bottom that cradle the computer. Then I have one strap with two bolts to hold the computer down and in the brackets.

The foam-rubber weatherstrip will give me something to snug the computer down against so it won't come loose.

The foam-rubber weatherstrip will give me something to snug the computer down against so it won’t come loose.

View from the backside.

View from the backside.

Here it is welded to the firewall.

Here it is welded to the core support.

Pic of the finished, painted mount with foam weatherstrip installed.

Pic of the finished, painted mount with foam weatherstrip installed.

Computer bolted in.

Computer in.

Perfect? definitely not, but it is simple and should work out pretty good.

Perfect? definitely not, but it is simple and should work out pretty good.

Meanwhile Christmas came and went leaving me with a new camera and a sawzall… So I decided to use both of them!!

Is that??

Is that??

Yep.

Yep.

Looks good. Will look really good after I build a tube bumper for the front that matches the rear.

Looks good. Will look really good after I build a tube bumper for the front that matches the rear.

This is the intake I pieced together on Amazon. 4" all the way through, ended up costing about $80.

This is the intake I pieced together on Amazon. All Spectre parts. 4″ all the way through, ended up costing about $80.

Amazon Intake Parts List:
Spectre 8131 Black 3″ Cone Air Filter
Spectre Performance 9723 Aluminum Intake Tube
Spectre Performance 9771 Black 4″ Intake Coupler
Spectre Performance 9781 Black 4″ 90 Degree Boot 

Here is the intake installed. It conflicts with the upper coolant hose outlet on the water pump. Haven't decided what I am going to do about it yet. You can also see the installed throttle cable in the background.

Here is the intake installed. It conflicts with the upper coolant hose outlet on the water pump. I will probably have to order another piece or two once I decide where I want my filter to be.

 

Stay tuned for Part 8 when I tackle wiring the whole truck from head light to tail light and convert all lights to LED.

 

    Ol’ Blue LS Swap LINK INDEX:

 


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