NET) propose des petites annonces gratuites de voitures anciennes et de collection, un agenda des manifestations et un annuaire des professionnels de l'automobile de collection. The 1990 Chevrolet 454 SS is a high performance full size pickup that mated the C1500 standard two wheel drive cab with the 454 cubic inch / 7. Your truck is like 255 stock. If you find a plug in this condition, check the rest of them. had to go to smog referee to get it passed. GM Trouble Codes - Check Engine Light Codes. We want the best flow numbers with the smallest port volume and the highest velocity (up to a point). the truck has 72,000 miles on it. The early systems from 1982-1986 are just too old to do much with. The engine was zero decked, bored. 3) A numbers. 30 over), AFCO radiator with dual fans (Sniper kicks them on at 185°F), Stewart 180°F thermostat (high flow style), 16 lb Stant cap. There's information showing the largest GM TBI comes off the 454 engines prior to 1994, so 1993 or older is suppose to have dual 2" butterflies rated at 645 cfm. 383 chevy 450 horsepower street stroker engine. Also you will notice a bigger gain. 3L (W) L35 Engine. This is on a 1995 454 TBI without going to premium fuel. The stock ones are 45 lb/hr. Your TBI will make way more power and be more reliable than a carb ever will. Each TBI has a complete one year warranty. It was like night and day. TBI are known for leaky throttle shafts. Unfollow gm tbi parts to stop getting updates on your eBay Feed. Obx Throttle Spacer For 91 To 95 Chevrolet Silverado Ck 454 Tbi 7. Chevrolet LT1 general information. More power and mpg for a Gen VI 454? Another (which I like more, and looked like they really flow benched it) came up with 242 intake cfm. the small block TBI was rated at 490 CFM stock, and the big block at 645. Also what gear are you running in the rear. CFM Technologies specializes in GM Throttle Body Injection, Carburetor Spacers, and drag racing, circle track racing, and street & marine performance. 3l V8 Motor 140k Miles $925. Or at a lesser degree batch fire. Whether you stick a turbocharged LSX engine between your frame rails, or put nitrous on your big block, the Terminator™ ECU can grow with you, unlike the competition where you are stuck with an entry level ECU. At same time I will get rid of that crappy TBI setup and change to a full sequentiell EFI using Vortec parts, distributorless ignition with coils and PCM from a LS1 which I can easily programm myself to my liking. it should however have a 4bbl manifold but use a TBI adapter for the TBI. You may have to change the injectors to 350's, they swap out pretty easy. 1987-1991 were still SLOW computers with tiny chips limiting what can be done with the system. In order to improve a TBI 350, it need to breath better. you need diffrent heads, diffrent cam, a quadrajet would bolt right on and that is your best bet for induction. RBS Superchargers is a professional supercharger building and repair service that stocks new and used parts, blower kits and accessories. Depends upon how built up your fresh 350 is. nice carbs when they actually work. Your order may be eligible for Ship to Home, and shipping is free on all online orders of $35. This is a popular carb for the small block Ford and is the trickiest Performer carb to tune. Had the injectors Flow matched and ultrasonically cleaned by witch hunter performance. Direct shipping means you get it fast and our experienced new engine center employees know most of the accessories that you may need to finish your repower or new engine installation with minimal problems. GM Throttle Body Injection 1987-93 LO3 (5. 2" blades """"" ?? the reason I'm asking, is If I run the 454 tbi the throttle would be cracked less than the 350tbi at same engines speed/load correct. Also, if plugs are old, but look great, except for a VERY thin, black appearance, that won't wipe or scrape off; is that indicative of an engine problem?. Along with Plug and play wiring connectors to adapt it to the 350 TBI motor. TBI Wiring Harness W/ECM 350 SBC 454 BBC TBI ENGINE SWAP. com specializes in (OEM) original equipment TBI Assemblies. I used a modified TBI unit off a 454 and it screams like a MF, but dialing the idle in is a real pain as the BB unit was fat even on a 454. Impressively enough, the TBI system was able to support the considerable power jump, almost matching the horsepower of the Dominator. The throttle shaft is very tight, no slop. 5 PSI on an injector flow bench using test fluid with same density as gasoline. I'd recommend using the PROM chips from factory police vehicles. 0L) and LO5 (5. The calculator will tell you the cfm range you need. as the throttle wouldn't be opened as much as it would be with the smaller tbi. This is what the next volume in the Ultimate TBI series adresses. CSI Automotive Sales, Service & Parts. About the only thing an '88 TBI 350 has going for it is that it is a 1 Pc. Unfollow gm tbi parts to stop getting updates on your eBay Feed. Every TBI will be Flow Bench tested, calibrated, and idle adjusted making it ready for easy installation. I also plan on getting the ecm reprogramed to handle the more bigger motor. · GM ECM used in 1987-92 trucks. 95 38-1796 throttle body spacer 454 w/tbi 87-90 (1) $59. The stock 305 / 350 TBI units can flow about 505 CFM. There is a list of mods to the TBI that will improve air flow in to the engine. 3 superchargers and Ford inlet systems on Cobra’s, Lightning’s and Shelby’s with Kenne Bell has been – and still is a huge part of our business, as will be the 2019 Shelby GT500 with it’s relatively small 2. In fact, this two-barrel unit is known for increasing a vehicle's torque and horsepower by up to 25 to 42 percent--greater than the output of most stock throttle bodies. RPS Alpha One Gen 1 and 'pre-Alpha' Rebuilt kit (1972-1990) with Gimbal Bearing, Exhaust, u-Joint, Shift Bellows, Gasket, Water Hose. You may want to look for something like that. what size carburetor for my 454 chevy? i had a 750 edelbrock carb on my stock 454 with peanut port heads so im guessing it was only around 230-250 horsepower at the most and it ran great and had loads of power most of it was low end torque. The computers in the tbi trucks don't like a lot of changes. (I'm running the big one at the moment) The cam is a Comp Cams LT1 unit, the chip is custom from Brian at www. 95 shipping available. Background: Traumatic brain injury (TBI) is one of the most common types of injury, especially among young adults. This system is based on the Production GM (Chevrolet) throttle body fuel injection system and electronics used from 1987 to 1991, on 305, 350, and 454 engines. This is the delima i have with my trail rigs 454. Hours: Mon-Fri 10am-7pm • Sat 10am-6pm. So, assuming a middle-of-the-road figure of 4 cfm per hp, and a typical intake flow of 390 cfm at 0. the check engine light was on all the way but it ran great. I was thinking of adding a TBI UNIT: 670 CFM Holley 2-bbl with 80lb/hr Injector Holley 670 CFM adapted for use with Howell or GM wiring harness and ECM. RBS Superchargers is a professional supercharger building and repair service that stocks new and used parts, blower kits and accessories. Mercury/Volvo Optimum Marine series TBI kit Starting from $1375. I have some brodix bb3's and bb2 extras sitting around. REMEMBER FREE SHIPPING THIS KIT IS FOR A STOCK BIG BLOCK CHEVY 454 (7. 8 L Engines LUV: 4 CYL 2 BBL HITACHI: 1972: All. There is a conversion factor. Loosely install the TBI on the intake manifold using the new base gasket provided. 7L 670 CFM TBI. This corrects the mating of the throttle body and intake. 00 cab is for sale at 400. RV with Chevy 454 engine problems: Mark: 9-9-09 : I have a 1986 El Dorado motor home with a chevy 454. It was originally purchased in 1978 as a project engine for my dad’s 1930 Model A coupe. 3L V6 TBI an an example: Stock 4. Each TBI comes complete with injectors, TPS, air control valve, and throttle body bushings. Well in my opinion a cold air intake, exhaust and a tune from TBI chips. On the TBI unit itself, again, depending upon how built up your 350 is, you may actually need the 2" TBI unit(aka one from a 454). It has run open loop for years to putter and plow the driveway on an estate. I have been looking forever trying to find an ideal idle RPM for my 350 small block with the edelbrock 600 cfm. 454 Vortec - What happened to the horsepower? Showing 1-14 of 14 messages. 550 Horsepower 496 Big Block Chevy "Judgement day" Not wanting to leave anything up to chance we bolted the 496 to the DTS engine dyno. Holley designed these throttle bodies with all relevant emission provisions and hook-ups for a true 50-State legal installation. Mercury/Volvo Optimum Marine series TBI kit Starting from $1375. So I've been a fan of the Carter AFB Edelbrock carb on my street cars for many years. Part #: BP4962CTC. 2 cfm available to the cylinder at full valve lift, it generates 1 hp. it is equipped with a 4l80e overdrive trans that is controlled by the computer. Explanations of each input are below the calculator. TRB Fan IOM. If you find a plug in this condition, check the rest of them. Forged Connecting Rods, Power Forged Pistons 8. 500” exhaust, on a 4" bore at 28" H2O, with clay radiused port opening. Flow Calculator; Looking for 500 horsepower to the rear wheels? How about 1000 horsepower at the crankshaft? You can determine what size fuel injectors you will need by entering a few simple details into our calculator. This page is dedicated to the owners of these vehicles equipped with GM's dual point fuel injection (model 220 TBI). 4L/454 Intake Manifold and Carburetor Combos and get Free Shipping on Orders Over $99 at Summit Racing! Perf. RV with Chevy 454 engine problems: Mark: 9-9-09 : I have a 1986 El Dorado motor home with a chevy 454. cal is very strict on after market parts. Data Sheet. Repack your core in the box that your remanufactured carb came in, adhere the UPS label, and give to any UPS driver or UPS drop box. Plus, you can use any intake for SBC with a TBI adapter. 7lt tbi is a 530 cfm unit (1-13/16 opening) the 454 uses a 670cfm unit with a standard 2" bore. Putting it all together: Fuel Pump Selection. The result is much more air flow and equalized fuel. *RPO stands for Regular Production Option. simple and easy!. NET) propose des petites annonces gratuites de voitures anciennes et de collection, un agenda des manifestations et un annuaire des professionnels de l'automobile de collection. Works Fr s. but by the time you do all that, it still isn't. The 454 TB (also 50mm) is rated at 670 cfm at 1. Just upgraded to the big block radiator from the original small block radiator in my '90 Burb. heads are easy peasy. 4L Compatible With GMC CHEVY C/K Pickup Truck Van Camaro 305 350 454 HEI652R Red. Installing a Holley 670 CFM or GM 454 large bore TBI unit is a popular performance upgrade for V­8 TBI or carbureted engines. We sell wholesale to the public. 5:1-CR street engine, you can expect that for every 3. The larger throttle blades allow for more CFM flow. I attached some comparison pictures. Uses special Howell calibration PROM. The 454 TB has a bigger bore (670 cfm, IIRC) and larger injectors. 454 Budget Build. New and Remanufactured Throttle Body Assemblies for 305, 350, 454 Chevy, GM, GMC Trucks, Cars, Vans and 6 Liter and 7 Liter Trucks. I used a ported throttle body from CFM Technbologies, Inc. Engine Power–1200+ HP C7 Z06 Corvette. then there is a tentioner for the trans throttle on the drivers side of the tbi unit. I am very happy with these mods, there have been no problems at all. and that would phuck up the t. Though they might physically fit you will limit your rpms to less then 4500 and might lean out the engine. GM TBI 220 & TBI 300 ADJUSTABLE FUEL PRESSURE REGULATOR It has become common practice to remove the original fuel pressure regulator and replace it with an aftermarket adjustable unit. REBUILD KIT GM Tbi Throttle Body 200 220 85-94 Chevy Caprice Impala Mc S10 Blaze - $39. I have some brodix bb3's and bb2 extras sitting around. 5:1 Compression. Spectre air intakes are manufactured from high quality polished or powder coated aluminum tubing and come complete with a high flow air filter engineered to increase airflow and performance. The 454 system would be calibrated to flow more fuel then the 292 would need. Also, different year models used different connectors. similar to a chainsaw you cant have it to. My TBI was bored to 800 CFM, so I had to do some intake port work to match the new butterflys(not sure boring TBI was necessary---but I was in that mind-set at the time!! haha)and gas-matched the intake to the heads, plus smoothed and cleaned up the inside runners. If it is sooty, it could be a sign of a bad fuel pressure regulator. PLEASE READ!!! The majority of our truck listings are derived from the sales data of the carburetor manufacturers. I saw another thread on here sorta about it but it went nowhere. Holley 500-6s Throttle Body Aluminum Silver 670 Cfm 2-barrel Tbi Each tbi throttle body, 454 tbi. For the most part they are the same. It set new sales records with 53,807 produced for the 1979 model year. TBI Wiring Harness W/ECM 350 SBC 454 BBC TBI ENGINE SWAP. 650 Cfm Mighty 650 Cfm Mighty Demon Annular Blow Thru Turbo Carb Mad 650 bt Free Usa Shipping. FAST is the leading developer of electronic fuel injection systems, EFI components, intake manifolds, tuning tools for high performance and street applications. as the throttle wouldn't be opened as much as it would be with the smaller tbi. With some careful porting there is another 5-10 CFM or so to be had. 383 chevy 450 horsepower street stroker engine. Cam and heads are probably next after that, but the throttle body is an amazing start that will probably net almost as much increase as the cam and heads will. GM TBI Swap. I should be able to use the 2. Find great deals on eBay for 454 tbi holley. A 30 % increase in horsepower, torque and fuel economy is seen over carburetion. I still think a 350 tbi will work on a 455 and probably for sure on a 403. In fact, this two-barrel unit is known for increasing a vehicle's torque and horsepower by up to 25 to 42 percent--greater than the output of most stock throttle bodies. Shop with confidence. The package comes complete with timed and full vacuum ports, primary 0. Enter the engine's displacement, Volumetric Efficiency, and its redline. Chevrolet CPI 1992-2004-4. shut it off and restart it and ran fine all the way home. 3L TBI unit looks to big to fit the 235 intake. Two versions of the optional 454 were available in 1-ton Chevy trucks. I use an electric fan from a 95 Ford Windstar van on my Chevelle w/ 454. While the advantages of being able to adjust fuel injector pressure are not certain, adjustment does give the opportunity to change open-loop fuel flow. But 1st thing isto decideif you're staying tbi, if you are, are you staying stock or getting it tuned. We’ve put together this quick-guide to reading your vacuum gauge to help you identify potential mechanical or tuning issues more quickly. You may have to register before you can post: click the register link above to proceed. The world's absolute lowest prices since 1985. 1970 Chevelle 454 Ls6 Intake And Carburetor Setup Manual Trans 3963569 4557. 2L Exhaust Systems. cal is very strict on after market parts. Just make sure all of the setup parameters are properly changed to TBI in the engine parameters screen. I am doing the same set up on my sroker. Also, different year models used different connectors. I'd recommend using the PROM chips from factory police vehicles. Good stuff. Please join us in Loving, Sharing and Memorializing C. This is what the next volume in the Ultimate TBI series adresses. This tool will help find the needed size for your engine and horsepower configuration. I used a ported throttle body from CFM Technbologies, Inc. What I ended up doing was buying a holly TBI unit. Before adding the adjustable regulator, I added a gauge at the TBI inlet to see what my current pressure is. The rest of the truck is in good condition. 5:1 Compression. 4 TBI is what I used with my whipple supercharger before I sold both. Gone was the LS7 454 and in its place was an "LS6" 454 four-barrel V8 rated at 425 horsepower. I also plan on getting the ecm reprogramed to handle the more bigger motor. Only 2 Remaining - Ships Immediately. 5L motor that has a 1 barrel TB on it and is almost the same size as the 1bbl carb. 00 // high end sleeper is complete an for sale at $1200. I crank the adjuster all the way up. The Complete History of Chevy Big-Block Engines The Family Tree Unlike lesser engines, the evolution of the big-block Chevy can be traced back to a prestigious great-great-grand pappy, the high-performance 425-hp L78 396, first available in 1965 Corvettes and Chevelles. Recommended 454 I have made some changes to this page after learning a lot the hard way of course with my 1991 454SS project truck. Re: Olds EFI options?? Recomendations Please. My reasoning for looking at the larger TBI was started when I read the 350 TBI setup is only capable of feeding up to 275 HP. 5:1 Compression. Home Search Links About Us Updates TBI Store Login. You can go bigger, but it will be harder to set up and tune, and remember, the TBI is only 650 CFM or so. 7lt tbi is a 530 cfm unit (1-13/16 opening) the 454 uses a 670cfm unit with a standard 2" bore. Proflow Vc-220 Valve Covers Stamped Steel Black Chevrolet Big Block 396 454 Who. Kit Gm Tbi Throttle Body 220 Chevy Gmc Truck 454 1991 1992. 0L) and LO5 (5. This system is perfect for your everyday Driver right up to your weekend Street Machine or Bracket Racer. It also has a 670 CFM flow rating, so there's no doubt about its performance on the road. The engine was zero decked, bored. it should however have a 4bbl manifold but use a TBI adapter for the TBI. 454 Vortec - What happened to the horsepower? Showing 1-14 of 14 messages. \Chevrolet Truck Carburetors. Re: Olds EFI options?? Recomendations Please. You may have to change the injectors to 350's, they swap out pretty easy. Greenheck’s systems and products are used in commercial, institutional and industrial buildings. The TBI 454 had fuel injectors in the middle of the throttle body that increased fuel efficiency, power and durability. Recommended 454 I have made some changes to this page after learning a lot the hard way of course with my 1991 454SS project truck. So, assuming a middle-of-the-road figure of 4 cfm per hp, and a typical intake flow of 390 cfm at 0. But milage will only get better by ridding the TBI and going to sequintial fire multi port. Just upgraded to the big block radiator from the original small block radiator in my '90 Burb. Remove a spark plug and examine the end of it. 4L) ENGINE Complete Fuel Injection System for Stock Big Block Chevy 454 Fuel Injection System Includes: TBI - Rebuilt 2. but by the time you do all that, it still isn't. You may have to change the injectors to 350's, they swap out pretty easy. From what I read, even with the mods I did to the TBI unit, I'm missing out on about 30-40+. With the small port heads done in this fashion, it is entirely possible to approach the 700-hp mark from a relatively low budget 482 (1/8-inch overbore on a sonic-tested thick-wall 454 block). and that would phuck up the t. 00 Chevy 383 / 350 HP 4 Bolt Performance TBI Balanced Crate Engine Truck Camaro $ 3,095. Thanks again. Stock small-block throttle bodies only flow around 500 cfm (compared with a stock Q-jet that flows 750 cfm). 7l Chevy Truck. 95 shipping available. Find great deals on eBay for 454 tbi holley. Cooling Systems Guide for Big-Block Chevy Engines You may be building a hot rod to serve as a home for your big-block powerplant, but for maximum performance you have to keep your cool. 3 tbi's==they all have some adjustment on flow rate and you need an air fuel gage to tell where you are at on all driving conditions to tune it in==I have a old holly setup for this knobs to dial in. 454 Power Build. Each TBI has a complete one year warranty. TBI6501 350 small block Chevy, 700 CFM 4 bbl TBI unit, 65 lb. I'm changing to an electric fuel pump and don't know what to buy. This corrects the mating of the throttle body and intake. I am currently setting up a 454 TBI throttle body to hold the 350 tbi injectors. Please join us in Loving, Sharing and Memorializing C. Chevrolet LT1 general information. I like the chevy tbi and I am going to try to keep it. I want something that will give me a. Do not reuse the TBI flange gasket. A vacuum gauge is an invaluable resource for tracking down engine issues. 454 Power Build. This page is for information about GM Tuned Port Injection EFI swaps. Engine Size like 350 or 454 etc. 1989 Chevrolet Suburban 2500 454 Big Block 7. TRUCK APPLICATIONS. 7L TBI engines. Also, if plugs are old, but look great, except for a VERY thin, black appearance, that won't wipe or scrape off; is that indicative of an engine problem?. Re: Olds EFI options?? Recomendations Please. 1775 N Lapeer RD. I have TBI on my 383 and I used a harness from howellefi. Online purchase is quick, easy and secure because we are a PayPal Verified Merchant. All backup systems. it broke down on my daughter so I picked it up and replaced the fuel filter and some b. I have a BBC TBI on it now, but also have an injector plate that goes under the TB, with 2 injectors and dedicated controller. Auto Sales dba Weinle Motorsports 4885 E. CFM Tech is a great source of info for TBI improvements. So, assuming a middle-of-the-road figure of 4 cfm per hp, and a typical intake flow of 390 cfm at 0. Then I went to a heavily modified TBI unit with bigger injectors and larger throttle blades which now flowed 625 cfm and would support. 7L) engines. 900 cfm compaired to 390. I have a 1978 Silverado 3/4 ton long bed pickup with a TBI 454 and a turbo 400. The pump is a concern, but it doesnt have to be large. The package comes complete with timed and full vacuum ports, primary 0. Cory explained that the six hour drive would be tough because the Nova was equipped with a GM 454 big-block crate engine with a monster carb on top. TBI6501 350 small block Chevy, 700 CFM 4 bbl TBI unit, 65 lb. as the throttle wouldn't be opened as much as it would be with the smaller tbi. Tune up specs for 1993 454 chevy engine - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. com or call (360) 969-2925 Due to the many options available I do not have the shopping cart enabled at this time. It may be a problem to choose a new carburetor for it because there are many carburetors that fit Chevy 350 — so here I’ve collected 10 best carbs in order to make your life easier. 7l 670 Cfm Tbi. The complete TBI system comes with all components needed for a closed loop system except for air cleaner, throttle cable/linkage, and fuel lines. Skip White Performance provides many high performance racing and engine products such as, stroker engines, turn-key engines, cylinder heads and pistons. 383 Chevy 600 HP Blower Engine, Stroker 4 Bolt Main Block, Forged Stroker Crankshaft. 00 Chevy 383 / 350 HP 4 Bolt Performance TBI Balanced Crate Engine Truck Camaro $ 3,095. What is correct fuel pump pressure for 1989 chevy 454 with CARBURETOR. tbi manifold to spread bore or square bore adapter. POWERHOUSE has thousands of stock and high performance parts for cars and trucks. The 350 tbi is more plentiful, easier to find and cheaper than a 454. This page is for information about GM Throttle Body Injection EFI swaps. CSI Automotive Sales, Service & Parts. The early systems from 1982-1986 are just too old to do much with. What I ended up doing was buying a holly TBI unit. That means an option available from GM when the truck was new. New and Remanufactured Throttle Body Assemblies for 305, 350, 454 Chevy, GM, GMC Trucks, Cars, Vans and 6 Liter and 7 Liter Trucks. Hard to beat prices for Tbi Throttle. 700 peak valve lift, the power potential would be 97. Toggle navigation Community Chevy Automotive Sales Inc. Spectre air intakes are manufactured from high quality polished or powder coated aluminum tubing and come complete with a high flow air filter engineered to increase airflow and performance. An engine can usually handle a throttle body with larger bores (and thus more CFM airflow) with EFI. 73 rear axle ratio with an Eaton Locking rear differential. TBI are known for leaky throttle shafts. Posted By: pimpinfresh1986 on 01/11/15 01:33pm I have a 1990 Fleetwood flair with a 454 tbi so far I have replaced fuel filter, ignition control module, injectors checked all fuses and still im getting no initial primer shot but if I pour gas in it it will start and then stall soon as gas runs out could it be the ecu or ecm and what is the fuel pressure supposed to be and could it be something. Installing a Holley 670 CFM or GM 454 large bore TBI unit is a popular performance upgrade for V­8 TBI or carbureted engines. i still have to deal with this in two years when i have to smog again. They are engineered for a "bolt-on" installation on stock factory manifolds for the applications cataloged. I was just pricing injectors for my suburban (bored as mine are fine at the moment) when I noticed that the stock part numbers for the '93 and '94 are different. Our patented design enables each cylinder to draw air and fuel from both throttle bores. efi holley projection holley pro jection 454 tbi tbi Body 87-89 GM P/U 5. 4 TBI you will need to change the IAC plug on the wiring harness to match 7. 95 Add to cart; GM 5. The throttle body on the 350 only flows 670 CFM. 4lx Tbi Gen. Showcasing tbi in stock here online. Carburetors for Mercruiser. 4 liter V-8, 3 speed turbo hydramatic transmission and a 3. This is a rebuild kit for the Rochester GM 200 and 220 TBI Throttle Body Injector [also known as the Two Point TBI] found on a very limited model numbers of Chevy and GMC applications with the 2. There are multiple casting numbers used. New Listing Holley 502-3 MD 3210 TBI 500 CFM 1985-89. The BB fan shroud stops just prior to the fan blades, so I'm going to need to make an extension about 3-4" long, in order to bring the shroud out past the blades the way the OE shroud was built. 1987-1991 were still SLOW computers with tiny chips limiting what can be done with the system. Loosely install the TBI on the intake manifold using the new base gasket provided. TPI is a fuel injection system that uses individual injectors for each cylinder that are mounted in the intake manifold and usually ends up looking much different than a traditional carbureted setup. efi holley projection holley pro jection 454 tbi tbi Body 87-89 GM P/U 5. Side question: Is that 383 a high-performance engine? Mine is and I'm kinda regretting going with TBI because it's CFM limitations are holding the motor back. Posted By: mikebrassard on 01/27/15 01:28pm Last year, I purchased a used 1993 travelaire 34' class 'A' MH w/t a chev 454, (TBI i believe) and has the 4 speed A/T. At same time I will get rid of that crappy TBI setup and change to a full sequentiell EFI using Vortec parts, distributorless ignition with coils and PCM from a LS1 which I can easily programm myself to my liking. The fan clutch is just what the name says, it is a mechanism that will clutch the fan on and off depending on the need for more or less cooling air to flow thru the radiator. Wasting fuel does not yield more power. The TH350 is an automatic shift, three-speed transmission. — Flow Velocity or the speed of the air through the port is just as important. 5 inch rubbers. Fuel is also limited on the stock TBI (only 2 injectors) so some combination of larger injectors (copcar, or 454 truck) plus higher fuel pressure is needed to feed the engine.