I have those same flex injectors and my e-bay Multec to EV-6 adapters look completely different.



12613412 next to 2005 LQ9 injector

 

Thanks, do you have a link to the adapters you have?

 

Just checked my e-bay purchase history and these are the ones.

LQ4, LQ9 4.8 5.3 6.0 Delphi wire Harness to LS2 LS3 LS7 EV6 Injector Adapters

 

Thanks for the help, the ones I bought are actually from the same seller and the description he says is exactly the same: male Delphi style on "his harness end" to EV6 female. So this makes no sense.

I also having problems with my Walbro 455 lph. It looks like you got the Walbro drop in with the bucket included, my problem is they don't make a "drop in" with the bucket already included for a returnless system since I have an 05. All the information that I can see almost everywhere from everyone else on the forum is for return systems. It seems like everyone around here converts to a return system and i'm not quite sure why. My stock original bucket with the metal top was rusted so bad the metal lines broke off when I was pulling it out, so I went and stupidly bought a new Delphi one at Advanced auto for $350 when I should have been more patient and got one from Rock auto or really should have went to the junkyard and pulled one.

I got the Walbro 450 lph pump but the people who sold it to me say it requires extensive modification to put in the stock bucket, even though they say it is a direct replacement on their website. So none of this is going as planned and I've already got about $800 into this. The new Delphi bucket I got has an additional hose coming from the pump that looks like its for the venturi thing for when fuel is low, however my stock original one dosen't have this extra line coming from the pump and neither does the Walbro 450, so I am even more confused. I think its important to have this feature so I don't have to worry about running out of gas.

Does anyone know the best way I could go forward? Or should I really convert to return system? I also can't find the pressure regulator on the new Delphi or my original bucket and I am also hearing that the 450 will overpower it as well, even though the people who sold me the Walbro 450 said specifically that "it will not overpower the stock regulator" and it is a "direct drop in". This stuff can seem so hopeless at times and make you feel like you are just throwing money out the window haha

 

Contact the seller maybe they shipped the wrong adapters. Do they look like those on the ebay site?

I'm in the process of going returnless when I swap the old truck intake for the TBSS. As as many members here have done the universal Walbro pumps, I'm sure someone can help out. I've never done one and that was one of the reasons I went with the drop in unit, the 255lph should be plenty for my N/A setup.

 

I contacted them and sent pictures, it does look like they put the wrong pins in the connector housing.

I really want to do the TBSS/NNBS Intake too, but I wonder if our 6.0 gmt-900 flex fuel injectors will work with the TBSS manifoldn? I wouldn't think there would be a problemaproblem. Also every time a GMT-900 hits the junk yard
​everything is ripped apart and gone by the time I get there. Rock Auto does sell the AC Delco manifold for $128 I think but I know there is some more stuff I think you have to do.

 

The injectors will work as they came out of a NNBS intake but with square ports. The hard part is choosing the correct fuel rails to match the injector height as the rail cups that hold the injectors are different heights. To complicate things further is the TBSS cathedral intake intake has the fuel rail mounting tabs on the inside whereas the NNBS square port (that our flex injectors came out of) has the rail mounting tabs on the outside so the rails are not interchangeable. Then the later TBSS intakes have different MAP sensor hold downs and our trucks can't use that newer style MAP sensor. So the early TBSS intakes up to 2009 has the same MAP as the older trucks. The TBSS part number 12580420 intake is the one to buy. Then us return style guys have to run a Corvette filter/regulator to use the non return TBSS rails, then change the injector flow rate in the tune to a non vacuum referenced regulator flow rate.

 

So I was walking at the junkyard today and thought I had struck out since the 2007 NNBS truck they had someone had already beat me to it and pulled the motor, I was hoping to get a NNBS intake it had a 4.8. I came across another suburban that had the motor pulled and I looked at some heads just sitting there on the ground and they had 706 stamped on them.

Unfortunately LKQ likes to overcharge for things though and I had to pay 117 for both of them, I forgot to get the rockers though, but I guess I can reuse my existing ones.



I am thinking of sending them off to one of the big name shops to get CNC'ed and get bigger valves installed as well and milled also.

I just hate spending that kind of money and put them back on to this escalade then end up selling it. I don't think anyone who buys it will care. I am running some projections on DynoSim for as high compression I can get an E85, the numbers look good so far but its still not going to be as fast as I want it to be. I know everyone is going to say turbo too, but to me the work to install these heads and a cam is the same amount of work or less than trying to install a turbo and dealing with frustrating exhaust routing. On top of that this truck is filled with rust and I know I am going to have a nighmare in front of me trying to remove these rusty headers. I just feel really unmotivated right now to do anything.