5.3 harness vs 5.7 harness
Not gonna work the way you think. Not even remotely. What you’re gonna do is simply swap the long block and reuse every single part from the car. And I mean everything right down to the crank pulley. You will not be using anything from the truck, especially not the PCM (computer).
If you want to send out your camaro PCM to get reflashed with some better air/fuel/ignition tables that are more suited to the 5.3, you could do that, but if you plan on putting the 5.7 back in there, I wouldn’t waste the time or money.
If you want to send out your camaro PCM to get reflashed with some better air/fuel/ignition tables that are more suited to the 5.3, you could do that, but if you plan on putting the 5.7 back in there, I wouldn’t waste the time or money.
I went through this same swap on a 2000 Z28. Yes you should use the stock 5.7 harness and the stock 5.7 computer (should change the tune to reflect 5.3L).
But as others have said, you will just be using the 5.3 long block. You will need to swap over the following from your 5.7:
Complete Intake
Coil packs (unless you want to make spacers to move the 5.3 driver side coil packs to clear the fuel line)
Front accessories including the water pump and crank pulley. To mount the alternator, you will need to drill and tap one boss on the block.
And don't forget the LS1 oil pan, windage tray, and oil pickup.
Think I had to change the Oil Pressure Sending Unit too, but the rest of the 5.3 sensors were fine iirc.
But as others have said, you will just be using the 5.3 long block. You will need to swap over the following from your 5.7:
Complete Intake
Coil packs (unless you want to make spacers to move the 5.3 driver side coil packs to clear the fuel line)
Front accessories including the water pump and crank pulley. To mount the alternator, you will need to drill and tap one boss on the block.
And don't forget the LS1 oil pan, windage tray, and oil pickup.
Think I had to change the Oil Pressure Sending Unit too, but the rest of the 5.3 sensors were fine iirc.
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Joined: Aug 2014
Posts: 12
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From: Vegas
do u guys know if the color of the plastic connectors on the ecu matters? i know some of the truck are blue and red while some ls1 are green and blue. Would either one be able to be use as long as both are gen 3 engines?
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And you cannot simply swap them, lots of things are different. lt1swap.com will tell you what needs to be changed.
Joined: Nov 2003
Posts: 6,216
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From: Wichita KS / Rancho San Diego
Think of it this way. He is simply swapping one bare longblock for another. Everything else remains the same as it sits on his 99Z. All he has to do is drill and tap the hole for the alternator bolt and substitute the different displacement in the tune and he is good to go.
Of course there are things he can play with and modify if he wishes (PCV routing, etc.)
Of course there are things he can play with and modify if he wishes (PCV routing, etc.)
