Mattt

I recently saw a 2006 Suburban w/ L59 5.3 engine at the pick a part, and noticed the fuel rails looked a lot like the fuel rails that are on a TBSS/NNBS intake manifold. Both were the SS box type rail. Anyone know if these are the same fuel rail?


I have a NNBS/TBSS intake for future use, but it has no fuel rails currently, so I'm looking for a set of rails.

Also wondering what injectors the NNBS/TBSS intake has from the factory and how would they compare to my existing 2004 5.3 Flex Fuel L59 injectors 33#?

I've read the L59 FF injectors are a 33# slightly higher flow over the std. LM7 5.3 engine injectors.

In researching the NNBS/TBSS swap, I seem to remember reading previously that the Flex Fuel engine made for an easier swap for some reason(maybe injector plug being the same), but I can't remember what that reason was for sure. Anyone know what about the Flex Fuel 5.3 adapts easier to the NNBS/TBSS swap?

Lastly, my '04 5.3 L59 has a return line. Is the corvette filter the only option for converting to NNBS/TBSS manifold and using it on a return style fuel system?

Thanks in advance for weighing in on this thread.

ILuvJDM

iTrader: (4)

No those are the flex fuel rails for NBS, but they are not tall enough to fit on a TBSS or NBSS intake. They have the same profile as the standard NBS rails.

Mattt

Ok thank you for the info on those. I was being hopeful with them working.

I also need the 4 bolt throttle body as the intake I have was bare. Finding one of these 4 bolt throttle bodies has been challenging. What is the going rate for a 4 bolt throttle body and what applications did a 4 bolt throttle body come on besides the NNBS/TBSS intake? Is it available from any other application? I've looked at various classified and parts sites and been unable to find a used factory TB.

In the past, I've seen one pop up in a pick your part with a busted intake manifold from a front end collision. The PYP wants about $50 out the gate to buy it but that seems pricey for a junk yard part to me. Is that a fair price, above or below the going rate?