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Blazer engine swap questions


Softailguy's Avatar
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November 10th, 2017, 2:24 PM   #1  
Blazer engine swap questions

Hello all. Im new here so please forgive me if this has been covered before. I have a 99 blazer ls with the 4.3 4x4. Friend of mine is selling his 04 silverado 1500 4x4 with a 5.3 to me dirt cheap bc its got frame rot. The drivelines fine but the trucks not worth saving to him. Anyway, ive been watching videos on youtube about swapping engines. I know i have to mod the crossmember, get electric fans etc. My big question is this. My blazers throttle is cable driven. His is drive by wire. Is it a simple fix like putting the throttle position sensor on the gas pedal when i switch the wiring? Or do i need to get a different intake manifold and keep it cable driven?

 
bandit_601948's Avatar
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November 13th, 2017, 2:27 PM   #2  
I have a 99 blazer 4.3 too ! a 4.3 is nothing but a 350 with 2 cylinders missing ! everything off the Silverado should fit on your blazer ! all you have to do is switch everything over from the truck to your blazer !

 
Softailguy's Avatar
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November 13th, 2017, 4:00 PM   #3  
Thanks for the input. Im aware that the 4.3 is just a 5.3 or 5.7 with 2 cylinders chopped off. Its the different intake setup thats throwing me for a loop. From what i can see ill have to add the throttle position sensor from the silverado as well. Probably not the hardest thing seeing as im getting the whole truck as a donor to work with and i have access to a whole shop full of fabrication equipment.

 
SBchevyfan's Avatar
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November 14th, 2017, 11:17 AM   #4  
Can you just swap the intake manifold from your 4.3 onto the new engine? If so, everything should work as it did on the stock engine?

 
Softailguy's Avatar
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November 14th, 2017, 11:49 AM   #5  
I honestly dont know. I imagine itd be too short, and short 2 intake ports. Itd also be most likely more work than adding the tps. Guess im lucky that i have literally an entire donor truck to monkey with.

 
SBchevyfan's Avatar
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November 14th, 2017, 1:03 PM   #6  
Misread your post, thought you were swapping a 4.3 for another 4.3. Are they both TBI engines?

 
Softailguy's Avatar
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November 15th, 2017, 6:59 AM   #7  
Yes, theyre both tbi, my 99 is cable driven while the 04 is computer actuated. Theres a sensor on the gas pedal telling the computer how much to open the butterfly

 
SBchevyfan's Avatar
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November 16th, 2017, 12:59 PM   #8  
You might want to see if your old throttle body and cable can be mounted on the new manifold. If so, I would think it would be a fairly straight forward swap.

 
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