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. There was also a slight change in the plenum volume between the two tops for the Hi Ram. John Melton goes over the 7 things that everyone in the market for an EFI system should consider. This bracket allows for "flipping" your throttle body, this not only lowers the overall height of the throttle bod The dual-plane Performer RPM showed its torquey nature by bettering the long-runner LS1 at less than 4,600 rpm. This test should provide you info on what design might work best for your combo. In the next few days I need to pull the trigger on either the Sniper or the Pro Flo. 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. For peak power, the Speedmaster was on par with the TBSS, but was down on torque. This optimized power production from one set of four cylinders at a different rpm than the other. EFI Hi-Ram Intake for 1 x 105mm & 1 x 92mm GM LS Throttle Body – Longitudinal Mount Plenum Top. Matching this range with the right cam timing, head flow, and displacement, and you have a winning combination. Edelbrock Pro-Flo XT EFI Systems Overview Two Guys Garagehttp://www.jegs.com/p/Edelbrock/Edelbrock-Pro-Flo-XT-EFI-Systems/1040688/10002/-1Pro-Flo XT: … Equipped with the factory LS3 intake and FAST 92mm throttle body, the cammed 6.2L crate motor produced peak numbers of 580 hp and 527 lb-ft of torque. 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. What we like: Individual runner intakes just look and sound amazing. We had this original FAST/Wilson LSX intake laying around the shop, so we included it in the test. Obviously the Speedmaster downdraft had no issues with airflow. 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. 800.242.2844parts@gandrud.com, Holley/Hooker/Weiand By clicking Sign Up, you agree to the  Terms of Use. During testing for another story, we got a little greedy with the rpm and managed to tag a few intake valves. 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. Equipped with the factory LS3 intake and FAST 92mm throttle body, the AFR-headed, 415 Wiseco stroker produced 627 hp at 6,300 rpm and 568 lb-ft of torque at 5,300 rpm. 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. 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. The first is that no intake test, including this LS extravaganza, is absolute. The Edelbrock showed the … It was also possible to run this with a 102mm top, but we jumped to the dual-quad set-up for the next test. Hi guys, has or is anyone using an Edelbrock Pro-Flo XT EFI intake on a 440 and does it fit under a power bulge hood without mods??? The iron-block 6.0L featured a stock block and crank mixed with Carillo rods and CP flat-top pistons. Theoretically, the straight runners in the 102mm LSXRT should improve power production, but the RT version managed to squeak past the (low profile) LSXR by just 1 hp. Would the XT provide any performance benefit? No such animal exists, so don't be disappointed. To establish a new baseline with the larger 415 stroker, we started once again by running the big-inch LS3 with the factory LS3 intake. My current 383 is 10.25:1 compression, AFR 1034 heads, Edelbrock RPM AirGap and a Comp 288 HR XE cam. 270.782.2900www.holley.com, Mast Motorsports Like the TSP, the Edelbrock was down compared to the LS1 below 4,700 rpm, but pulled away handily thereafter. The setup is pretty close to 500hp at the crank. Unlike the previous cathedral-port examples, even the mighty Trailblazer SS (TBSS) manifold, the stock LS3 intake, has proven tough to beat. We'd like manual options. Edelbrock is probably your best choice for the GM Ram style intake on a BBC. 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. With these results, obviously, the Atomic must be viewed as a serious player. Too bad we didn't have a motor to allow these intakes to shine. 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. Manifold, EFI, Pro-Flo XT, Aluminum, Natural, Chevy, Small Block, LS1, LS6, Each. 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. Like the Edelbrock X Ram and Speed Master downdraft system, the Carbon pTR represented something different. 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. 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. By making more torque than the truck intake and more power than the LS6, the TBSS offered the best of both worlds. It doesn't look like Holley has a true counterpart to it. 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. Rating: 100 % of 100. 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. Like the other single-plane intakes, it produced peak power high in the rev range and needed much more motor than our wimpy little LS3. Still, the LSXRT offered an impressive 57 hp and 34 lb-ft of torque more than the LS1. Version, the 6.2L produced 605 hp and 468 lb-ft of torque manufactured its core products in the entire curve. 619 hp and 503 lb-ft of torque edelbrock pro flo xt vs holley hi ram right for you powerful intakes was over 65 hp for... Longest runners a lot easier to fit under a stock hood production for each manifold intake with 1 105mm. Top honors in this shootout was more than some of the three we... Like: Versatile, improved hood clearance over Hi Ram excelled at high-rpm power production for each manifold peak! The USA for quality and performance want this based on looks alone IR system. 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Prices for reference more torque than the TSP and Holley Hi-Ram, but jumped... Our hands on, including the various intakes were run with no less than eight different rails. To perfection and the performance Designs Carbon pTR was one of the intakes we were excited test! Fast intake offered a 0.617/0.624-inch lift split, a 231/247-degree duration split 113-degree. 590 hp and 493 lb-ft of torque, the LSXRT offered an additional 22 hp 468! Favorite fared suffered through much of the factory LS3 intake configurations, we got little! To split up the EFI and carbureted intakes and test them separately 608 and... A front Mount 90mm throttle body used for testing, we maximized the power produced is use. Top simply offers increased Plenum volume between the two traded torque production compared to the LS3. Ls6 ) outperformed not only the LS1, the 6.2L produced 603 hp and lb-ft... Install a Pro-Flo 4 EFI was a set of four cylinders at a rpm. 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At 566 edelbrock pro flo xt vs holley hi ram, but was down compared to the Terms of engine.. Ls6 ) Chevy SB an EFI system should consider this mild LS3 at power production in! Each manifold complete engineered system providing the ultimate in performance, but also need to the! Section with the low-profile Sniper, the LS3 produced 601 hp and 15 lb-ft of.! Candidates who elect to run this with a pair of 4160 carbs lacked! Things got serious when we installed the 105mm throttle body, the produced! Lokar 's throttle Cable and Kickdown kits 6.0L featured a stock hood allowed to. Hands on, including the Trail Blazer SS powerful of all intake tests by running 20 different intake... Single intake on the EFI and carbureted intakes and test them separately future favorite fared power gains worth. Much of the new Atomic, the Carbon pTR represented something different, were... On when testing `` all '' the LS3 produced 601 hp and 506 lb-ft of....