Only advantage to FiTech Go Port is the ECU is in the throttle body and it's very easy to install, and it supports power adder. The peak torque output was down 17 lb-ft, but torque suffered through much of the rev range, something we have come to expect with short-runner intakes (at least compared to the stock intake). Equipped with the Edelbrock Cross Ram, the LS3 produced 590 hp and 543 lb-ft of torque. We were excited about testing the new Atomic intake, as the FAST has all but ruled the roost for aftermarket composite intakes. The motor powers my street trod, so most street duty, with occasional passes at the drag strip. 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. ... Edelbrock 7139 - Edelbrock Pro-Flo XT EFI Intake Manifolds. Provided here for your viewing pleasure are the results of part 1 on the EFI intakes. After testing the stock truck intake, we were excited about the installation of the new Flo-Flo XT intake. TPI (6) Holley Sniper EFI (4) MFI (4) Stock (3) TBI (3) Edelbrock Pro-Flo EFI (2) Edelbrock Pro-Flo XT EFI (2) FiTech (2) SFI (2) 4-barrel Holley Terminator (1) Edelbrock Pro-Flo 3 Throttle Body (1) Edelbrock Pro-Flo 4 EFI (1) Show All; Get Results. This is an important point, as many of these intakes were not designed for our mild cam-only LS3 crate motor (specs on our COMP 54-496-11 hydraulic roller measure 231/247 degrees at .050 and .617/.624-inch lift with a 113 LSA), and would be better suited to something with wilder cam timing, or more displacement, or both. Topping the 6.0L was a set of AFR LSX 230 V2 heads. Like the Edelbrock X Ram and Speed Master downdraft system, the Carbon pTR represented something different. MSD Atomic AirforceRetail Price: $949Construction: CompositePart Number: 2702Runner Length: 8.5 inThrottle Opening: 4.10 inThrottle-Body Size Tested: Holley 105 mmFuel Rail: Stock LS3Injectors: FAST 75 lbPeak Power: 592 hp at 7,100 rpmPeak Torque: 493 lb-ft at 5,400 rpmAve HP (3,0007,000): 442.4 hpAve TQ (3,0007,000): 460.0 lb-ftTQ at 4,000 RPM: 454.7 lb-ft, What We Like: Another powerful composite LS manifold to choose fromWhat We Don't: Slightly heavier than factory composites. The Edelbrock Pro-Flo 4 EFI comes preassembled exactly as you see it here with throttle body and fuel rails in place. Your information will be collected and used in accordance with our  Privacy Policy. This intake from Symbol Performance sure looked the part—we suspect many LS owners will buy this product based on looks alone—but we wondered how well the short-runner design worked on a typical street/strip motor. Pro-Flo 4 is a complete engineered system providing the ultimate in performance, drivability & quality. Watch the video above and decide for yourself what EFi system might be right for you. Naturally we wanted to include both the Edelbrock Pro-Flo XT and the Performance Designs Carbon pTR, but this was easier said than done. What Should We Test? We suspected the Victor series intakes were limited by the 4150 throttle body used for testing, even on this mild LS3. Summit price: $362 (plus the cost of the intake), What we don't: Cost and trade-off in torque lower in the rev range on this application. Though quite ugly, the factory LS2 truck intake is a pretty good piece, on a stock displacement engine. There was also a slight change in the plenum volume between the two tops for the Hi Ram. Fits the following intake manifolds: Stock LS2, Stock LS3, Stock LS7, Holley LS Mid-Rise, Holley 95mm Hi-Ram, Fast™ LSX, Edelbrock Pro-Flo XT using 4 bolt TBs & … John Melton goes over the 7 things that everyone in the market for an EFI system should consider. Obviously the combination required more airflow than the single throttle body could muster, so the dual 4150 throttle bodies allowed the system to breathe. What we like: Ominous black finish, easy to install, low profile, What we don't: Short runners limit torque production. This system is available with an EFI intake or a carburetor-style intake with a throttle body on top of the manifold and the Pro-Flo 4 can handle up to 775 horsepower, depending on the application. There is just something about a dual throttle-body cross-ram that screams performance. What we like: Sleek tunnel ram, black finish, easy installation, What we don't: Short runners tend to limit mid-range torque production. None of them belonged on a cam-only LS3, and should be used on a motor that runs to at least 8,000 rpm (not just 7,000 rpm). FAST LSXRT 102mmRetail Price: $999Construction: CompositePart Number: 146602Runner Length: 10.5 inThrottle Opening: 3.970 inThrottle-Body Size Tested: FAST 102 mmFuel Rail: FASTInjectors: FAST 75 lbPeak Power: 592 hp at 7,000 rpmPeak Torque: 502 lb-ft at 5,700 rpmAve HP (3,0007,000): 447.8 hpAve TQ (3,0007,000): 466.0 lb-ftTQ at 4,000 RPM: 464.3 lb-ft, What We Like: Design improves entry into cylinder heads to increase powerWhat We Don't: Height of intake may limit fitment. Pro-Flo 4 EFI systems feature a high performance Edelbrock intake manifold with a 1,000 cfm throttle body, fuel rails and individual injectors for each cylinder. Since the Holley Hi-Ram was offered with different tops, we tested it again with a dual-quad-top equipped with a pair of Holley 950 HP carbs. These Edelbrock Pro-Flo XT EFI intake manifolds feature aluminum construction with a natural finish. For this test, we replaced the standard LSXR upper intake section with the larger LSXRT intake. a pro flo intake p/n 7139 is $451.99, but also need to buy the fuel rail p/n 3629 and is $167.99. ... Pro-Flo 4 EFI Traditional 4150-Style Kit #35760 For 1986 & Earlier Chevy SB. The Weiand intake has been with us for years and continues to be a solid performer. What we don't: We'd like to see them use a GM TPS for easy hook-up and air cleaners are always an issue with IR system (though most don't run them). Edelbrock has been the leader in EFI for over 40 years. There are several things that are intriguing about Edelbrock’s Pro-Flo 4 EFI. ... Edelbrock EFI Manifold Pro Flo XT GM LS1 $ 516.95. Naturally, air/fuel, timing, and temperatures remained constant during testing. Many aftermarket manufacturers have discovered that the stock LS3 intake is tough to beat. Least powerful of all the factory offerings, the LS1 definitely limited the power output of our 6.0L test motor. Holley LS Mid-Rise 112-589 90mm Holley 95mm Hi-Ram Fast™ LSX Edelbrock Pro-Flo XT using 4 bolt TBs Most other 90 through 95mm LS intakes using 4 bolt TBs . The answer is, obviously, yes. Something we really liked about the Speedmaster unit was, at $220, it could be purchased for little more than the factory TBSS intake. I currently have stock set up and an old distributor which I’m going to upgrade. Like the Speedmaster, the torque was down compared to the Trail Blazer SS manifold, but we soon discovered that only two other intakes would best the peak torque offered by the impressive Trail Blazer SS. Featured in early Camaros, Novas, Chevelles, Monte Carlos, Bel Airs, Impalas, and Corvettes, the popular 396 powerplant terrorized local drag strips and gave high performance engines a new standard. Edelbrock Pro-Flo 4 EFI. The Edelbrock Cross Ram may not have offered the highest peak power of the test, but it did offer the highest peak torque (543 lb-ft) and the highest average power and torque numbers. Though the design differed from the other long-runner, aluminum versions of production manifolds, we grouped the Holley Mid Rise with the Weiand, BBK, and Speedmaster intakes. The Mid Rise offered improved hood clearance compared to the Hi Ram, but the power gains were nowhere near as significant. When selecting an intake for a cathedral-port application, the FAST is the go-to choice, but the gains are much less prevalent on the LS3. The carbureted combo looked impressive and managed to match the LS1 for torque and horsepower. The two-piece design allowed full CNC porting. The shorter runners must be teamed with a cam profile that will allow the motor to rev to the effective operating speed of the runner length. After running 20 different LS3 intake configurations, we came across a couple of stragglers who were late to the party. Edelbrock High Flow Intake Elbow for 120mm Throttle Body to 4500 Flange $ 174.95. Stepping into aftermarket cast-aluminum intake offerings, the Speedmaster intake offered shorter (and larger) runners than the LS1 as well as a larger throttle opening. The FAST intake offered impressive peak power and the highest torque production of any of the intakes tested. $ 906.95. Fuel Injection Style. The GM engineers got this one spot on! Holley Mid Rise EFIRetail Price: $647Construction: Cast aluminumPart Number: 300-126Runner Length: 5.00 inThrottle Opening: 3.64 inThrottle-Body Size Tested: FAST 90mmFuel Rail: HolleyInjectors: Holley 75 lbPeak Power: 566 hp at 7,000 rpmPeak Torque: 469 lb-ft at 5,300 rpmAve HP (3,0007,000): 424.9 hpAve TQ (3,0007,000): 442.4 lb-ftTQ at 4,000 RPM: 441.2 lb-ft, What We Like: Versatility and better hood clearance than Hi RamWhat We Don't: Less power than Hi Ram. We also ran the Holley Mid-Rise in carbureted trim, though the dual-carb Mid-Rise was a more significant change in the intake design than the simple lid swap on the Hi-Ram. The BBK was the final cast-aluminum, long-runner intake we tested, and it performed very well. 226 CC at 5.250 Length = Holley Pro Dominator Tunnel Ram 264 CC at 6.000 Length = Edelbrock Pro Ram II 325 CC at 6.281 Length = Edelbrock Victor Ram August 29 to Sept 3 , 1984 US Nationals at Indy B/FX Class Camaro 2212 Lbs 6.20 rear gears 5-speed trans 103.75" RollOut Lunati solid roller 286/288-108 on 108 CL During testing for another story, we got a little greedy with the rpm and managed to tag a few intake valves. As expected, the curve nearly matched the EFI Hi-Ram, though the carbureted combo fell off at the top with peak numbers of 586 hp. Though some of the shorter runner intakes made slightly more peak power, it is hard to beat this long-runner design for average power production. The power gains were most consistent at the top of the rev range, but like the factory truck manifold, the Speedmaster even offered additional torque down low. Racers have run these intakes with … It looks like the forward-facing throttle body of the Edelbrock would be a lot easier to fit under a stock hood. This bracket allows for "flipping" your throttle body, this not only lowers the overall height of the throttle bod That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. 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. What we like: Impressive appearance, cross-ram coolness, unique, What we don't: Expense, Set up for drive-by-wire throttle bodies. For peak power, the Speedmaster was on par with the TBSS, but was down on torque. The quality was good and looking back we would like to have tried an adapter and larger (4500) throttle body to see if it was restricting the airflow of this (and the 4150 Super Victor) combination. Theirs has a carburetor-style throttle body. Holley (2) Get Results. The Edelbrock showed the … The intake features adjustable runner lengths, but this stroker combination ran best with the longest runners. (Holley does have one like this for SBC, but maybe not BBC yet.) What we like: Dual-quad tunnel rams look amazing, What we don't: Hood clearance is not ideal and having to purchase two 4150s. Equipped with the short runners in the Fast LSXR intake, the LS3 really wanted to rev. The Edelbrock Pro-Flo XT showed its high-rpm strength by making peak power at 7,000 rpm, even on the big-inch LS3 stroker. These power curves were to serve as the baseline for the other two intakes tested on the 415 stroker. This combination produced peak power at 7,000 rpm and was the first intake we tested to eclipse the 600hp mark. Torque was up by 1 lb-ft with a peak of 475 lb-ft. Back in the days of leaded gasoline an experienced tuner would adjust the A/F mixture the engine was getting from its carburetor by reading the color the fuel left on the insulator of the spark plug in the exhaust port and in the first 6 inches of the exhaust header. Equipped with the Edelbrock Victor Jr., the LS3 produced 600 hp and 503 lb-ft of torque. Since 1938, Edelbrock has manufactured its core products in the USA for quality and performance. Holley Mid-Rise CarbRetail Price: $321Construction: Cast aluminumPart Number: 300-120Runner Length: 5.00 inCarbs: Dual 600-cfm 4160Peak Power: 538 hp at 6,900 rpmPeak Torque: 465 lb-ft at 5,200 rpmAve HP (3,0007,000): 419.0 hpAve TQ (3,0007,000): 438.3 lb-ftTQ at 4,000 RPM: 450.1 lb-ft, What We Like: Perfect for dual-quad LS swapWhat We Don't: 4160 carbs limit tuning. The Edelbrock Pro-Flo XT showed its high-rpm strength by making peak power at 7,000 rpm, even on the big-inch LS3 stroker. Youtuber Nashville Early Bronco wanted to figure out the best EFI system to run on his ’75 Bronco so he pit the FiTech Go Street that he’s been running against the Edelbrock Pro Flo 4. Featuring 555 cubic inches, 723 horsepower and 652 ft-lbs of torque (with Pro-Flo 4 XT EFI), the engine is built by Pat Musi in his racing facility, using parts provided by Edelbrock. Like the single throttle body version, the dual-quad Hi Ram excelled at high-rpm power production. ... Edelbrock EFI Manifold Pro Flo XT GM LS1 $ 516.95. An extra 31 hp more than the LS1 is a hefty chunk of power and shows just how limiting the factory manifold can be on a modified 6.0L. $ 906.95. We had this original FAST/Wilson LSX intake laying around the shop, so we included it in the test. We suspect the Hi-Ram might show even greater gains with a wilder or larger test motor, but on this combo, the curves offered by the two tunnel-ram intakes (Hi-Ram and Pro-Flow) were all but identical. This version featured slightly longer runners than the low version. A review of the data will reveal that the difference between the least and most powerful intakes was over 65 hp. Not surprisingly, the aftermarket jumped on the band wagon to offer all manner of intake combinations for the new cylinder head configuration, so it was only natural that we had to test them. According to Edelbrock, the Pro-Flow XT … The setup is pretty close to 500hp at the crank. By making more torque than the truck intake and more power than the LS6, the TBSS offered the best of both worlds. Holley LS Mid-Rise 112-589 90mm Holley 95mm Hi-Ram Fast™ LSX Edelbrock Pro-Flo XT using 4 bolt TBs Most other 90 through 95mm LS intakes using 4 bolt TBs NOTE: Holley’s LS throttle bodies work with intakes that are ported and non-ported. Holley also offers a 92mm top for the Hi Ram, but you will need the 102mm version on almost any application except a turbo 5.3L. Manifold, EFI, Pro-Flo XT, Aluminum, Natural, Chevy, Small Block, LS1, LS6, Each. Free Shipping! In short, this was the most extensive LS intake manifold test ever devised. Equipped with the FAST adjustable LSXRT intake (with short runners), the 6.2L still produced 603 hp and 495 lb-ft of torque. Either version should easily fit under the hood where a factory manifold works. What we like: Amazing CNC work, the kind we hate to ruin by running, What we don't: Expensive and we feel it needs a 4500 flange (which they offer). EFI Hi-Ram Intake for 1 x 105mm & 1 x 92mm GM LS Throttle Body – Longitudinal Mount Plenum Top. Equipped with the FAST adjustable LSXR intake (medium runners), the 6.2L produced 593 hp and 512 lb-ft of torque. What we like: OEM quality fit, finish and impressive power. Symbol PerformanceRetail Price: $700Construction: Fabricated aluminumPart Number: 81001Runner Length: 5.5 inThrottle Opening: 4.01 inThrottle-Body Size Tested: FAST 102mmFuel Rail: TSPInjectors: Holley 75 lbPeak Power: 587 hp at 7,100 rpmPeak Torque: 470 lb-ft at 5,500 rpmAve HP (3,0007,000): 425.6 hpAve TQ (3,0007,000): 442.8 lb-ftTQ at 4,000 RPM: 439.5 lb-ft, What We Like: Impressive visual statement and top-end powerWhat We Don't: Fuel rails that use pipe fittings. $1,895.95. What we like: Better looking than stock LS3, adjustability, What we don't: Cost and minimal power gains over stock LS3. This optimized power production from one set of four cylinders at a different rpm than the other. Edelbrock Pro-Flo XT EFI LS2 Intake Manifold $566.05 $554.95 Holley Hi-Ram EFI SB Ford 302W 95mm $783.15 $769.95 Holley Hi-Ram EFI SB Ford 302W 95mm - side mount $783.15 $769.95 Essentially, they differed by way of runner length, and this version offered the shortest runners. Stock Trail Blazer SSeBay Price: $210Construction: CompositeRunner Length: 9.5 inThrottle Opening: 3.45 inThrottle-Body Size Tested: FAST 90 mmFuel Rail: FAST (modified mounts)Injectors: Holley 75 lbPeak Power: 562 hp at 7,000 rpmPeak Torque: 497 lb-ft at 5,000 rpmAve HP (3,0007,000): 444.4 hpAve TQ (3,0007,000): 464.6 lb-ftTQ at 4,000 RPM: 469.5 lb-ft, What We Like: Bigger throttle opening and best overall factory performerWhat We Don't: Limited availability and even more expensive than the LS6. That is why we are also including average power production from 3,000 to 7,000 rpm, torque production at 4,000 rpm, cost, throttle opening, runner length, composition, and even What We Liked and might change on each design. Is an intake manifold an important part of a performance LS build? 270.782.2900www.holley.com, Mast Motorsports Oh sure, it is possible to shift power production higher in the rev range with shorter runners, but this usually comes with a trade-off in low-speed torque, sometimes a significant one. 1 Review Add Your Review. Accepts a front mount 90mm throttle body that feeds the intake all the air it needs for maximum performance. Design provides improved clearance on Edelbrock carbs. It seems the Mid Rise Holley needed more airflow, as replacing the single throttle opening with the dual 4150 throttle bodies definitely improved the power output. 909.605.1123Speedmaster79.com, By clicking Sign Up, you agree to the  Terms of Use. You will notice that these peak engine speeds nearly match the cam-only 6.2L run with the stock manifold. Summit Price: $362 (plus the cost of the intake), What we like: Even More Top End Power than medium runners, What we don't: Cost and trade-off in torque on this mild LS3 application. Now we need to see how much boost it will take. Holley 300-122 - Holley EFI LS Hi-Ram Intake Manifolds. As you can see, there is nothing about a multi-port injection that is any more complicated than TBI. The Test Engine The polished finish would be right at home on a show car. Holley Sniper or Edelbrock Pro Flo 4? Leaning toward Pro Flo 4. Things got serious when we installed the 105mm throttle body on the Holley Hi Ram. The Edelbrock Pro-Flow shared the tunnel-ram design with the TSP and Holley Hi-Ram, but the runners were slightly longer than the TSP. The tunnel-ram intake offered impressive peak performance, but torque production did suffer compared to the stock LS3. What we like: Polished appearance, easy to install, still low profile, What we don't: Short(er) runners limit torque production. By clicking Sign Up, you agree to the  Terms of Use. Stainless bracket mounts to rear of Holley, Edelbrock, AFB, Quadrajet, Demon (excludes Street Demon), and In-Line Dual Quads. The system was polished to perfection and the center-pivot throttle assembly worked well. Sure, you can add power higher or lower in the rev range, but there will almost always be some sort of trade-off compared to the stock intake. What we like: Impressive power, strong visual statement. Unlike the previous cathedral-port examples, even the mighty Trailblazer SS (TBSS) manifold, the stock LS3 intake, has proven tough to beat. Blessed with what were essentially race heads right from the factory (flowing 315 cfm), the rec-port motors offered even more potential than the factory cathedral-port combos. Though the peak output shined, the short runners once again traded torque production lower in the rev range. Unlike the LS6 that matched the power of the LS1 down low (then took off), the TBSS intake offered more power and torque everywhere. Edelbrock is the most respected name in performance! Often referred to as the truck intake, the LSXRT top simply offers increased plenum volume on this adjustable intake application. Like the single-plane, carbureted intakes we tested, this piece offered short intake runners designed to promote power production higher in the rev range, and that is exactly what it did. 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. Holley 300-122 - Holley EFI LS Hi-Ram Intake Manifolds. My current 383 is 10.25:1 compression, AFR 1034 heads, Edelbrock RPM AirGap and a Comp 288 HR XE cam. Naturally, all testing was run with the same air/fuel and timing values that maximized power production for each manifold. i'm sure i can get it cheaper through other suppliers, but i'm using these prices for reference. Edelbrock Pro-Flo XT is engineering at it's finest with the introduction of these EFI intake manifolds. That work continues today through Holley’s market-leading EFI products as well as through Holley’s family of best-in-industry brands. Equipped with the short runners and FAST LSXRT top, the LS3 produced almost identical power to the standard LSXR top. First up was the LS6 intake. Edelbrock Pro-Flo XT LS1 EFI Intake Manifold . We'd like manual options. These Sniper intakes sure looked the part (especially the polished ones), and many will be purchased on looks alone. Sep 17, … Matching this range with the right cam timing, head flow, and displacement, and you have a winning combination. Holley EFI Hi Ram Intake with 1 x 105mm GM LS Throttle Body Flange, Longitudinal Mount Plenum Top For LS7 - Black. Compared to the LS1, torque was down slightly up to 5,200 rpm, then the Mid Rise started strutting its stuff. I was just curious if anyone had any first-hand experience with it. Like the others, the short-runner Hi-Ram traded torque below 4,700 rpm to the LS1, but motored away on the big end. Equipped with the FAST adjustable LSXR intake (long runners), the 6.2L produced 585 hp and 533 lb-ft of torque. eBay Price: $155Construction: CompositeRunner Length: 11.0 inThrottle Opening: 2.960 inThrottle-Body Size Tested: Accufab 78mmFuel Rail: Wilson billetInjectors: Holley 75 lbPeak Power: 535 hp at 6,900 rpmPeak Torque: 468 lb-ft at 5,100 rpmAve HP (3,0007,000): 418.9 hpAve TQ (3,0007,000): 438.6 lb-ftTQ at 4,000 RPM: 446.4 lb-ft, What We Like: OEM quality and fitmentWhat We Don't: Least powerful of all the factory intakes. WeiandRetail Price: $519Construction: Cast aluminumPart Number: 300-111Runner Length: 11.5 inThrottle Opening: 3.030Throttle-Body Size Tested: Accufab 78mmFuel Rail: Wilson billetInjectors: Holley 75 lbPeak Power: 566 hp at 6,900 rpmPeak Torque: 487 lb-ft at 4,900 rpmAve HP (3,0007,000): 438.3 hpAve TQ (3,0007,000): 457.7 lb-ftTQ at 4,000 RPM: 463.7 lb-ft, What We Like: Ease of installationWhat We Don't: Small throttle opening and weight of cast-aluminum manifolds vs. composite. This intake combination needed increased displacement and/or wilder cam timing to take advantage of what it had to offer. 936.560.2218mastmotorsports.com, Performance Design Equipped with the factory LS1 intake and Accufab 78mm throttle-body, the 6.0L produced peak numbers of 535 hp and 468 lb-ft of torque. BBK SSIRetail Price: $499Construction: Cast aluminumPart Number: 5004Runner Length: 10.0 inThrottle Opening: 3.345 inThrottle-Body Size Tested: FAST 90mmFuel Rail: Wilson billetInjectors: Holley 75 lbPeak Power: 568 hp at 6,900 rpmPeak Torque: 489 lb-ft at 5,400 rpmAve HP (3,0007,000): 439.2 hpAve TQ (3,0007,000): 458.2 lb-ftTQ at 4,000 RPM: 462.0 lb-ft, What We Like: PerformanceWhat We Don't: Weight and flexible bottom cover.