Fuel leaks with a system designed to run at 43 to 58 psi is very dangerous. The brackets end up in a Z-shape to bolt between the fuel rail and the manifold and are easy to make.īe aware however that adapting fuel rail mounts can be hazardous from a fuel leak standpoint because if the mounts are not accurate, the injector can leak between the fuel rail and the injector o-rings in the fuel rail. We made our own out of 0.120-inch sheet aluminum. The Sniper fuel rail kit is affordable but it does not include mounts for the TBSS intake. The factory fuel rail is unique to this intake and rather than buy a new one (which might be expensive and will still need to be adapted to the fuel delivery system), we converted our TBSS over to use LS1/LS6 aluminum fuel rails from Holley. If you already have a stock truck intake on your 5.3L engine, then you can adapt the injectors and probably the MAP sensor too. This manifold is bare which means you will need fuel rails, injectors, a throttle body complete with sensors, and a MAP sensor. The good news is that you can buy this as an AC Delco part straight out of the Summit Racing catalog for a good price considering it’s a brand new composite AC Delco part. But first, let’s answer your question about where to get this intake. Of course, EFI means several other changes to your car. My guess is that the Trailblazer SS intake would also fit under your hood line. I’ve never measured the clearance for an LS swap in a second generation Chevelle like yours but I do know that this manifold will clear the stock hood of the first generation ’64-’67 Chevelles. The biggest issue with the TBSS is its height, which means it can be a tight fit with the hood closed. The TBSS will make more torque than the earlier truck intakes and yet will make more horsepower than the old LS6 intakes. The GM engineers did their homework on this intake as Holdener discovered. The Trailblazer SS (TBSS) intake is tall like the early truck manifolds but a little wider. Conversely, the early LS Corvettes and Camaros used a much shorter intake that gave up a little torque to make more peak horsepower. The truck intakes were designed to enhance low-speed power in the rpm range where trailer towing puts a heavy emphasis on torque. He compared that Trailblazer intake to both the stock, cathedral port truck intake, and the LS6 Corvette intake. Our buddy Richard Holdener has probably done more LS engine dyno comparative testing than anybody we know. The SS models came with LS2 truck engines that were equipped with a different intake manifold than the car version, and it works very well. This was stock on the 6.0L Trailblazer SS model SUV. The intake that I think you are referring to is the GM Trailblazer SS intake. Does this manifold exist? If so, where do I get it? The engine is stock but I’m thinking of ways to make a little more power. Do you know what he’s talking about? I have a ’69 Chevelle that I’m about to put an iron 5.3L into. He said it was from a truck or an SUV but he wasn’t sure. I’ve heard there is a really good factory LS intake manifold out there for cathedral port intakes but the friend who mentioned it didn’t know anything more than that. The throttle body mount is a four-bolt so there are plenty of options including Holley’s affordable Sniper 92mm unit. We’ve outfitted it here with custom brackets to mount a Holley fuel rail. Would this yield noticeable results vs adapting to the 3 bolt TB and stock setup? As I'm on a budget (aren't we all?) I'd much rather spend the ~$25 for an adapter than the ~$240 for the x-link plus TB if the end result is the same.This is the TBSS that we’ve used on several engines during dyno testing. The truck is tuned already, if that has any bearing (understanding it will need to be refreshed post-install).Īdditionally, I've read some swap to the larger TB and need to purchase an x-link to make it work. Herein lies my question, I've read the stock injectors on the LQ4 are just barely capable of handling the stock setup, so should these be upgraded to higher rate at the same time as the install? If so, what poundage should I be looking at? I'm not looking to boost or anything I would think would need a huge increase. Not a big deal as I was looking to swap over my injectors to avoid needing adapters. I'm currently looking to purchase a TBSS intake via Marketplace for install on my '03 LQ4 and it's missing an injector (and TB as is typical). I understand this topic has been discussed ad nauseam, but the forum search and links to other forums yielded conflicting results (and also missing photos, thanks photobucket).
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