If you get a fuel filter from a C5 Vette, it can attach to the return line, and will regulate at 58 lb. Our '03s have a return line for the fuel, and our stock intake has a fuel pressure regulator system attached. ) You need to account for the TBSS being a 'returnless' system. (adapters are available to connect our harness leads to the TBSS 'USCAR' type injectors. TBSS fuel rail (you can't swap the one from your 360). Air ducting to the larger TB (various options) The throttle body (I got the TBSS one with mine, so I'm set) Here's what you'll need to account for (short version): But since I'm doing other things first, here's some info for you. I'm actually doing this now, as part of my Sierra build. It would also seem like an easier route would be for someone to make a 3 bolt throttle body bigger that 78mm.but I havent found 1 anywhere. Even if it's possible to use the 78mm on a 400hp motor it would seem logical that the peak torque and HP numbers would have to come at a much higher RPM. Maybe another reason they went bigger was to keep the usable torque numbers lower also. ![]() The 1 Im looking to use appears to have been used starting around 2009 and its 90mm. Which is why GM has increased the size of the throttle body as their HP numbers have increased. I would think its safe to assume the 295/310 hp that 78mm equipped motors run is about the top of its range and when trying to go over that you need more breathing capacity. They use a lower flow injector that just doesnt allow for much of an increase in air flow that you need when trying to make more HP. However once you start looking for more HP the 78 is very limiting. I dont think as Mooseman pointed out there is a huge difference in intake alone. In 05 they went to an 87mm 4 bolt throttle body and just kept getting bigger from there. But it's going to be a bit of time until then, as I mentioned above.įrom my research which is amateur hour at best.03-04 all came with a 3 bolt 78mm Throttle body. And of course, when I do put this in, there'll be pics and a write-up. My thanks to everyone who supplied input on this. If true, it would be a pretty cheap upgrade for '03-'05 5.3L owners. ![]() Would be a great way to be able to source one, via the pick-n-pulls.)īTW - I did check Rock just now, and indeed, at least for 2006 GMC 5.3L, the part # ( 12580420 ) and pic matches the TBSS (see post above.) So that could apply for non-Denali models as well, since that was the last year for the LWB. (For 2006-2009 Denali owners who want to see if they've got the TBSS intake - I'm sure we'd all be interested if you did. The article I linked to above has pics of the 'stock truck' intake (which I have), and the TBSS intake - you can see the difference there, if you're curious. The headers will go on at the end, after I put the heads back on) It'll be a little while before I put it on, b/c I want to eliminate taking the top half of the engine apart twice (if I put the cam in I've been looking at, a new set of lifters are going in, to - and the heads have to come off for those. The guy mentioned that he thought *all* 5.3L Envoys & TBs got the TBSS intake starting in 2006 - we surmised that the advertised HP increase between the LM4 and LH6 versions might have been (at least partly) due to this update, if GM actually did give all the later 5.3L V8s the TBSS intake. The TL DR version: It came out on top of all the factory intakes they tested, including the LS6 version. The guy I picked it up from had stated about 30hp increase, and pointed me here- where one of the enthusiast mags tested 20 different LS intakes (both factory & aftermarket.) The LS2 in the Chevrolet Trailblazer SS and the Saab 9-7X Aero are rated at 395 bhp (295 kW) (2006–2007) or 390 bhp (290 kW) (2008–2009) and 400 lb⋅ft (542 N⋅m) of torque due to a different (sometimes referred to as a "truck") intake manifold that produces more torque at lower RPMs. The LS2 in the E-series HSVs are modified in Australia to produce 412 bhp (307 kW) and 412 lbft. The compression of the LS2 was also raised to 10.9:1 compared to the LS1s' 10.25:1 and the LS6s' 10.5:1. The LS2 uses the "243" casting heads used on the LS6 (although without the sodium filled valves), a smaller camshaft, and an additional 18 cubic inches. It is similar to the high-performance LS6, but with improved torque throughout the rpm range. It produces 400 bhp (300 kW) at 6000 rpm and 400 lb⋅ft (542 N⋅m) at 4400 rpm from a slightly larger displacement of 5,967 cc (5.967 L 364.1 cu in). ![]() It also appeared as the standard powerplant for the 2005–2006 GTO. The LS2 was introduced as the Corvette's new base engine for the 2005 model year. Nice find and with the extras it seems like a deal.
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