By Dan Sanchez, DS Media If you thought a small block LS V8 couldn't make big horsepower without a supercharger, then you haven't heard of Mike Mavrigian's project 408. © 2020 Power Automedia. He pulled in just as we were making our final pulls on the Holley LS3 Hi-Ram (300-117) so his timing was spot on. This entails using a custom wiring harness in place of the clunky production version. It works by replacing the existing system with longer tubing and an improved filter. Intake manifolds are formed to deliver air and fuel to the cylinders set in the engine. Injectors: Holley 75 lb Carb vs. EFI: A Look at LS Engine Induction Options. These operate just like the multi-point self-learning control systems. We have a great online selection at the lowest prices with Fast & Free shipping on many items! The carb flange is designed for a 4500 carburetor, and the intake is available as a carbureted intake without fuel injection bosses machined, or a fuel injected intake with either 8 or 16 injectors. If you plan on using a stock computer, an aftermarket wiring harness is a wise investment, as the factory harness is cumbersome. Ave TQ (3,000–7,000): 438.6 lb-ft This also requires a XFI ignition box to control the spark. Peak Torque: 493 lb-ft at 5,400 rpm With these results, obviously, the Atomic must be viewed as a serious player. The cost and power made it a desirable alternative to the factory LS1 intake. This intake combo showed there was plenty of power for swap candidates who elect to run their LS with carburetion. Related: ls carb intake cathedral ls intake manifold ls carb intake used msd 6014 ls carb conversion ls camshaft ls carb intake manifold ls msd box ls carb intake kit ls3 carb intake 5.3 carb intake ls1 carb intake Though the most affordable of all the factory offerings, the truck intake easily outperformed the LS1 by 14 hp and excelled at torque production, nearly matching the performance-oriented LS6. The dual-plane also offered more power at speeds of more than 6,300 rpm, but the LS1 was slightly better between those two extremes. Free Shipping! If you know how to work on carburetors, those antique fuel mixers do a pretty good job and do it for pennies. We promptly installed the L.O.D. For example, the factory generally sets the truck engines to run rich at wide-open throttle (WOT) to prevent overheating the catalytic converters. Ave HP (3,000–7,000): 419.0 hp The free MSD software allows you to set your ignition curve — or simply plug a two-pin piece in the side of the box that has a pre-determined ignition curve. Runner Length: 5.5 in TQ at 4,000 RPM: 426.6 lb-ft, What We Like: Simplicity of carburetion Runner Length: 6.50 in TQ at 4,000 RPM: 466.6 lb-ft, What We Like: Torquey nature of dual plane eBay Price: $155 Injectors: Holley 75 lb Though we know you have already skipped ahead to the data, there are two important points to consider. TQ at 4,000 RPM: 455.1 lb-ft, What We Like: The originator with plenty of performance Check out the results to see how your favorite or future favorite fared. Peak Power: 544 hp at 6,900 rpm For the absolute best solution for big power look no … When it comes to the subject of getting air to your engine, Briggs says that there are limitations on stock piece. Peak Power: 587 hp at 7,100 rpm Equipped with the LSXR, the modified 6.0L produced 591 hp and 505 lb-ft of torque. Then the self-learning software tunes the system to match your air-fuel ratio and ignition timing inputs. This arrangement will also need a fuel regulator. Ave HP (3,000–7,000): 438.3 hp We're still here and ready to ship your orders! This intake started the composite revolution, and we’d like to know how many were sold to LS enthusiasts before they upgraded to the LSXR versions. Our unique 2 piece design allows us to port the entire intake runner maximizing airflow and velocity. Save $10 off $299, $20 off $699, $30 off $899, $100 off $1,899 Orders One need only look at the peak power difference between the least and most powerful intakes in this shootout was more than 60 hp. Like the tunnel-ram intakes, the single-plane design featured short runners, but where the tunnel-ram intakes offered the same runner length for all eight cylinders (for even power production), the single-plane featured four long(er) and four short(er) runners. The production LS7 intake manifold was the first of the factory rectangle-port units, and considering that it was designed to feed a 427-ci engine that turns 7,000 rpm, it’s a very impressive piece of engineering. Ave TQ (3,000–7,000): 446.0 lb-ft* The performance is often worth the investment. Runner Length: 10.0 in So why take a giant technological step backwards? What We Don’t: Loss of torque inherent in single-plane design. $759.99 $749.99. Something we really liked about the Speedmaster unit was, at $220, it could be purchased for little more than the factory TBSS intake. With this carb & intake the 5.3L woke up and made 350HP @ 5600RPM and 370 ft/lbs @ 4100RPM. Like the others, the short-runner Hi-Ram traded torque below 4,700 rpm to the LS1, but motored away on the big end. Before we move on, let’s touch on tweaking the stock GM ECU with a tuner like HP Tuner, EFILive, or the new software from JET Performance. Design: Single plane Ave HP (3,000–7,000): 413.4 hp For our version of this scuffle, we’re going to place our attention on the LS engine. A stock 6.0L with a cam and headers will need at least 30 lb/hr injectors to supply sufficient fuel. Throttle-Body Size Tested: Accufab 78mm 8:00am - 5:00pm CST M-Thurs. What We Don’t: Like to see larger throttle opening and longer runners. - Read More. $1,118.95 Ships directly from the manufacturer in 24hrs It also requires a factory fuel rail specific to this intake. The LS7 intake has proven to be extremely effective in … Intake manifolds are combination specific, meaning that the ideal intake for an 8,000-rpm stroker combination would be different than one designed for a stock 4.8L truck motor. 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