the-jag-guy

iTrader: (11)

I know all of the parts basically interchange mechanically. What I',m wondering is whether the LS1 intake and 5.7 injectors can be run on a 5.3 with a (for the most part) stock 5.3L tune in the PCM. The engine displacements are very close.....

Has anyone tried it?

psiconversion

iTrader: (5)

Which MAF are you going to run?

Among other things, tune will have to be updated for the LS1 injector constant.

Jon
PSI

the-jag-guy

iTrader: (11)

What I'd want is to (ideally) put together a set up that would not require any retuning.

I have plenty of Camaro MAF, but if the truck unit is needed to go this way, so be it.

garys 68

iTrader: (1)

You can run the truck flex fuel injectors on an LS1 intake without changes. You just need an aftermarket fuel rail ($99 on ebay). The LS1 fuel rail wont reach the shorter truck injectors. Or you could use the truck fuel rails. Earlier truck injectors will work too, you just need to remove the plastic tips.
05 L59, truck injectors, harness, TB, MAF, f body LS1 intake.

parks450

iTrader: (17)

Just get injector adaptors from fci their fairly cheap and nice pieces,have some myself.

STUNTMAN

I have a 2000 truck 5.3 I want to swap the intake out on. You are saying that I can put my truck fuel rails and injectors in the LS1 intake. I just have to remove a plastic tip? I haven't pulled my injectors out yet, and I have never seen any out of a truck intake. with that being said, is it easy to tell what I need to remove?

garys 68

iTrader: (1)

A little more info with pics.
http://www.performancetrucks.net/for...e-swap-359987/

Z28-Vortec

iTrader: (4)

Sorry for bringing this older thread but I just want to make sure I am understanding this correctly.

So all I would have to do to use the flex fuel truck injectors part #12613411 on a LS1 intake is after market fuel rails like in the picture?

LS1 injectors are 60mm and truck are 48mm. Correct me if I am wrong.

The main thing I am wondering is how are the rails mounted to accommodate the height difference of the LS1 injectors vs the truck? Cut or trim the intake at all or custom mounting brackets for the fuel rails?

Thanks

garys 68

iTrader: (1)

"Custom" mounting brackets for the rails might be an overstatement. They're just little L shaped pieces of metal. But yeah, you just need to make shorter ones.

ctd450

iTrader: (1)

Are those $99 eBay rails any good? Are the an adapters o-ring or pipe thread? I am building an Ultra4 car and another U4 racer had his rig burn to the ground a few years ago because he ran cheap fuel rails that were npt on the ends, and one of them cracked around the an adapter.

Normally cheap parts scare me and fuel systems are one of those areas where i prefer to spend more money on good stuff and worry about paying for it later on, but if these rails are as good as the FAST or Aeromotive fuel rails they might be worth a shot.

Z28-Vortec

iTrader: (4)

K I wanted to double check, I couldn't quite tell from the picture.

garys 68

iTrader: (1)

They're ok, no leaks. But yeah they are NPT and I could see how cranking one down too hard could crack it. I would definitely upgrade if I needed new ones.

diesel240

iTrader: (4)

Finally an answer!!!

99VetteFRC

I put the LS1 intake rails and injectors right on my 4.8. It started and ran fine for a few months before I changed the injectors and put the turbos on. I bought EV1 connectors for $17 (for all 8) and put them in the harness. Very painless.

Z28-Vortec

iTrader: (4)

Where did you buy your connectors?

99VetteFRC

These are the exact ones I bought.

http://www.ebay.com/itm/8-Injector-connectors-Ford-Chevy-VW-GM-Buick-Jeep-Ev1-/290553010504?pt=Motors_Car_Truck_Parts_Accessories&hash=item43a64f1948&vxp=mtr

Z28-Vortec

iTrader: (4)

Thank you!

jiveass

i know this is old, but im runnin a 5.3 in my trans am, ls1 intake and injectors, maf...all the factory ls1 stuff on the 5.3...even ls1 tune.....car seems to run fine..has been for a year now as my daily driver....im not sayin it couldnt run better if tuned, but for me, its worked just fine the way it is.

autogeek23

iTrader: (13)

i understand this is old like stated above. i am going to be swapping in a 5.3 from a 2010 silverado. my ls1 stuff is going on it. intake etc. i understand the cam sensor is now in the front timing cover and the cam gear might be different. i want to use my 3 bolt cam from my ls1.

i have been searching for a while now still looking to find the adapter harness for the cam and crank sensors so they will work with my stock harness. also the adapters/extensions for the knock sensors that are now relocated to the side of the motor. i found them somewhere on here but cant find it again

any help is appreciated. i will continue to search in the mean time

fastcrash30

That cam swaps not gonna be easy with your 3 bolt cam. Someone correct me if I'm wrong but that 5.3 will have a single bolt cam w/4x cam gear that will only work with the 58x crank pickup wheel. Older ls1 had 3 bolt cam with 1x cam gear and 24 or 28x crank pickup wheel I can't recall which it was of the two. And the ls1 cam pickup is at the rear along with the sensor. Be easier to keep the cam in it or buy one for that application.