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Testing the waters to see if anyone has done an intake manifold upgrade to their 5.3L which led to a bigger throttle body swap as well. Not too sure if LS manifolds would be a good bolt on swap or if any modification would have to be made.. (L86) intake and throttle body on the 5.3 at least on the 14-18 trucks, i'm considering doing it.
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There are some things you can do to improve on it. I hope you find the information below helpful. Main Recommendation is dont touch the TBI 4.3L and if your 1994-95 4.3L has Vortec valve covers that does not make it a vortec engine. GM ran out of valve covers in 1993 and put vortec 4.3L valve covers on both engines.
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Re: performance upgrade for mercruiser 4.3L. Roller rockers 1.6/1 ratio will give you a little more lift and camshaft duration. Dennis moore makes high performance manifolds and risers for that motor also.
Edelbrock 600cfm marine carb with the 4.3 tuning kit. Edelbrock Vortec 4.3L 4bbl intake manifold.
Assuming you have a 190 hp model.
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With the factory internals limited to around 300whp, we're going to discuss five upgrades that can get you right up to these power levels: tuning, headers, camshafts, turbochargers, and carburetor upgrades (for the older versions). 4.3 Vortec Power Limits
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4.3 vortec marine Mercruiser/Volvo Penta S10 intake manifold conversion. You are looking at a Brand New 4.3 vortec MPI marine intake manifold assembled to be used as a bolt on Mpi conversion for your 1996-2003 S10 or full size 4.3 V6. This conversion eliminates the "spider" injection system that has been shown to be plagued with internal fuel.
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AFFORDABLE FUEL INJECTION offers multi-port fuel injection systems with many specific kits available for Chevrolet, Oldsmobile, Pontiac, Mopar, Ford and Buick. There are several kits available for Chevrolet that will fit most engines ranging from the 4.3-liter V-6 to 502 big-blocks. Kits include a port-injection-specific Holley intake manifold.
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However, V-8 and V6-90 main caps interchange, permitting V-8-style four-bolt main caps to be installed on the center journals, just like they can be fitted to a two-bolt-main 350 block. New cap.
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Induction The first (and last) modification that many people make to their 4.3L is to scrap the engine's stock intake and exhaust hardware for freer-breathing units. First things first: if your engine has fuel injection, then toss your throttle body, computer and intake manifold into the trash and set it on fire.
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The 4.3 manifolds are not that expensive, but need the same modifications and adaption that the V8 manifolds do. You will be in it roughly $800-1,000 for a full swap. I can see doing the marine intake if you have a modified 350. With a 4.3, you are better to just spend the same money and swap a 4.8, 5.3 or even 6.0L into the truck.
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covert your early 4.3L 5.0L & 5.7L GM Vortec to a more reliable MPFI spider system This article will explain the benefits of the GM CSFI to MFI Spider Conversion for All 1996-2001 4.3L 5.0L & 5.7L GM Vortec Engines As you may know the early style Central Sequential Fuel Injection (CSFI) or Spider units tend to fail overtime.
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The 4.3 Vortec engine is a V6 with 4.3 liters in displacement. The cylinder's bore and stroke are each 4.0 inches. With a 9.2:1 compression ratio, the engine has cast iron cylinder heads and a cast iron block. At 4,600 RPM, it has 195 horsepower and 280 lb-ft of torque. For smooth functioning, the 4.3 Vortec engine also has a balance shaft.
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Results 1 - 16 of 16 25 Records Per Page Default Sort Holley EFI Intake Manifolds 300-263 Intake Manifolds, EFI, Vortec Intake, Multi-port, 2,500-7,500 RPM Range, Cast Aluminum, Satin Finish, 4150 Flange, Fuel Rails, Chevy, 4.3-6.6L, Each Part Number: HLY-300-263 Not Yet Reviewed Estimated Ship Date: Tomorrow Free Shipping On Sale $490.46 $544.95
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Technical Engine & Performance 4.3 performance upgrades Jump to Latest Follow 50K views 50 replies 31 participants last post by robertcladner50 Feb 9, 2021 0Silverado5 Discussion starter 36 posts · Joined 2010 #1 · Jul 13, 2010 Like the title says I want some mild performance upgrades for the 4.3.
