need info on 5.3 swap
 

i bought a 5.3 out of a 99 1500 ,brought whole truck home,do i need anything out of the inside of the truck,i think i got a good deal for $500.00 for motor and everything, could anyone give me some info to help me out on setting my 87 1500 up for this,wiring,mounts,headers??????:waah:

Re: need info on 5.3 swap
 

You are going to need motor mount plates. I got my from transdapt i think they were 9542 there are two and i cant remember the difference but one wont work so double check you are getting the right one.

If you are going from carb to efi you "should" use a tank with baffles. Although not needed if you keep the tank over 1/4 full. You can use a fuel pump on your stock sending unit to get the 58 psi you will need for the 5.3l I think the part number is ep241 Its for a 95-98? vortec i think. For fuel lines you can get by with auto parts house "fuel injection" rubber fuel lines with two "fuel injection" clamps at each connection. Trust me you need the fuel injection hose for the psi rating and two clamps that are not worm style.

transmission mount unbolts and slides forward or back depending on which mounts and then rebolts. Driveshaft might have to be modified make sure you have about 5/8 of travel in the slip joint or you WILL send your pinion into your carrier and destroy your rear end. dont worry it will make a loud noise and spray gear lube on your back window right before it does so you can get in the slow lane on the highway.

For the wiring harness you can buy them from many different companies online. Be wary of ebay vendors that modify. You could check out lt1swap.com i got all of my diagrams from the and modified my harness to work.

with the exhaust i had to rotate the stock manifold collector about 30 degress and reweld it so i didnt have to cut or notch my frame.

DBW if a very nice setup and i like it very much but if you dont have it i think that you can use a OBS throttle cable from your pedal to the motor.

If you have any questions let me know i have just figured all of this out the hard way.

So are you having to keep all of your emissions components? It can be done and still pass smog and visual inspection!!!!

Re: need info on 5.3 swap
 

your '87 tank should be fine, an ive heard the EP381 is a better pump choice

Re: need info on 5.3 swap
 

thats it ep381 fits pretty good on the stock sending unit.

Re: need info on 5.3 swap
 

There is a ton of info on the LSx swaps in this sticky here......
http://www.67-72chevytrucks.com/vboa...ysprune=&f=206

Re: need info on 5.3 swap
 

i still have the whole truck,could possibly use the fuel lines of it???i will check on the mounts,i also found out that the trans harness is in with the motor,so that was a good thing,so i'm going to use the trans now,and i will check the harness link,will keep you posted,and some pics also thanks

Re: need info on 5.3 swap
 

Moved to the LS swap forum.

Search though the LS swap threads sticky at the top of the page and scroll down to the 73-87 section. There are a couple dozen completed and in progress swaps there.