![]() 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. This is the TBSS that we’ve used on several engines during dyno testing. ![]()
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