Is there any way I could send you that one as a core in return for one to work in my 2000? For a plain jane Sierra, not bad in my opinion. Well, they can be had stupidly cheap, not counting the extra work it takes to remove the engine and then dispose of the lifeless RV. Stage 1 Upgrade for Mercury 525 EFI. Heads, intake and headers would definitely wake it up. http://www.cumminsdieselspecs.com/cummins_timeline.html, http://www.internationalpowerstroke.com/timeline.html, http://www.duramaxdieselspecs.com/compare_duramax.html, Tow rig Suspension and Axle upgrades questions (4th Gen Dodge). Chevrolet 7.4 Vortec was a modern-day improvement of the firms most legendary big block. The old camshaft came out, too, with a meatier hydraulic bump stick with 0.600 inches of lift taking its place. A restrictive or clogged air filter will force the engine to work harder to breathe, which makes it less efficient. I am ready to pull the trigger if I continue to run 87 octane fuel. K&N Performance Fuel Filters are built for high flow rates and capacity while they provide outstanding filtration. We set all the parameters in the PCM, so you will not have a way to make adjustments on your end. Truth be told, Vortech offered a number of Maxflow Aftercooler systems but we selected an intercooler core we had on hand for testing. This is perfect for an otherwise stock engine as the gains are the best bang for the buck by far. A cold air induction setup will feed the engine cooler and more oxygen-dense air. Performance computer re-calibration and a Custom High flow Billet Flame Arrestor that increases the maximum power by more than 25 HP* and 30 pounds of torque*. For GM vehicles, the Vortec variant increased power by 60 horses. Not only did the cam swap net an additional 52 horsepower (peak-to-peak), but the gains exceeded 80 hp higher in the rev range. The stock Vortec iron head will not tolerate more than .440-inch lift. HOW TO UPGRADE YOUR TBI PEANUT PORT 454 - YouTube Headers exhaust. what features will i gain with this new unit. Using 3.5-inch aluminum tubing from CXRacing, we configured the intercooler between the YSI supercharger and the blow-through carburetor bonnet. Oil collects on the crankshaft counterweights, adding weight to the rotating assembly (crankshaft, rods and pistons), reducing horsepower through parasitic drag. Will this correct my RPM gauge issue? Parts overview- James L29 Vortec 454 build Ep2 - YouTube 0:00 / 19:37 Parts overview- James L29 Vortec 454 build Ep2 20,387 views Oct 10, 2019 391 Dislike Share Save Dick Hamm 4.68K. How much can you get them for? These 454 7.4L engines tend to respond pretty well to camshaft changes with good grinds that are designed to produce low and mid-range rpm torque increases. merci. Do you folks know of cam upgrades along with tuning that would give power upgrades on a l21 with a manual transmission ? Cost would be $495. These Chevy 454 Vortec engines made 290 horsepower and 410 lb-ft. Chevy 454 HO Crate Engine Vortec 7400 engines were the final version of the 454 used in production vehicles or trucks. These modifications will improve net mileage without sacrificing power, resulting in better overall mpg. I THINK I want a diesel until I look at the prices. Typical gains are 40-45 horsepower and 45-50 lb-ft torque, 4. Use for stock replacement OEM original equipment. I know that my question is very reduntant but I need to ask it .I pull a trailer and want a little more tow po1wer. I have a GMC PCM service # 16238212 for a 99 Topkick w/7.4L 454 gas engine; and was wondering if you are able to repair these PCMs/ECMs or have an equivalent I can replace it with? Learn more. Distributors cap and rotor kit features brass inserts and stainless steel rotor springs,designed to provide the best possible fit to ensure maximum conductivity between the distributor towers and spark plug wires,prevents arc through and crossfire. Also how much benefit do you think I would gain by going aftermarket catback exhaust. I installed a K&N replacement are filter in the stock air box. UltraPower 7.4L ECM Benefits: Gains of 40-45 HP and 45-50 lb-ft torque depending on existing upgrades Gains of 1/2 - 1 MPG Maintains speed and higher gears when climbing hills Opinions On the 7.4 / 454 Suburbans and engine - Expedition Portal They said they no longer support my RV and had no parts available. If you can supply me with your VIN and any part #'s that are on the ECM I can do some research. If you send it to us you avoid paying the core charge. First off, I snagged a used 454 throttle body off ebay and sent it out to www.rvmorsemachine.com to get bored to 54mm for some decent air flow for this big block project. As long as you don't have any emission systems removed, you will pass without any issues. I bought this truck brand new. The results: 567 horsepower and 537 pound-feet of torque on 89-octane pump gas! The 8.1 Vortec was produced to compete with Dodge's 8.1 Magnum V10, and Ford's V10 Triton engines of the time. Whats left, though, is a 454 cubic-inch big-block Chevy with huge potential. This is not an automatic check, it is performed manually by a parts specialist once the order is placed. This modification won't be cheap or easy to install, but will eventually pay for itself if you do a lot of towing or drive a lot of miles. Chevrolet Performance 10141280 Part Number: 809-10141280 Chevrolet Performance L29 Vortec Cast Iron Cylinder Head L29 Vortec Cast Iron Cylinder Head 1991-2000 Big Block Chevy Gen V/VI Engines Only Bare Head Sold Individually View Details $756.99 Ships on 03/02/23 FREE Shipping Lowest Price Guarantee Add To Cart I use the truck for towing and it is quite weak, If this ecm has to be reprogrammed in the future do I go to GM Dealer or have to send back to you?? Not sure if you have any other issues causing low power though because it should outperform the 5.7L, especially towing. I have a 1996 Winnebago with a P30 chassis and a 454 75,000 miles and runs great. I have the 411. Best, least expensive way to get more power out of this engine is with our custom tune. I have a few questions so bear with me here. 7.4 Vortec Performance Upgrades - BOOST YOUR ENGINE If not can a non uhaul ecm be used (ie plugged into the current harness)? Solenoid resistance: 12.5 Ohms. The banks system will give you 70hp and 85lb-ft. Would this work on 1996 7.4L L29? Normally, advancing the distributor would increase octane sensitivity and possibly fuel economy, but the upgraded ignition system will allow you to do so without adversely affecting fuel burn or horsepower. Thanks. I'm is Arizona and I'm planning a trip this month after Bonneville, to Aberdeen, home town, and Centralia, still have relatives there. Interested, but don't want to buy one to find out i've already got it :D (my unit has 2 previous owners i think). I just bought this 97 suburban 4wd with the bbc. After installed Ultrapower GM/ Workhorse 1998 7.4l Vortec 454c. Eric, we can program for EGR delete, cost would be $ 495.00 and would also include the performance tune . I am certain we can get more power and overall better drivability with our tuning versus your current setup. 5. I own a 1998 Safari Trek 2830 P32 chassis with an L29 28'7" Class A RV Drivetrain it s completely OEM.. Free shipping. Although Chevrolet does not explicitly recommend it, because a full synthetic is so slippery, you can use a lighter weight oil without risk of excessive engine wear. youll have to stick to a torque cam because of the computor needs vacuum (speed density) headers will help greatly. The 7400 was essentially the same big block 454 that carried Chevy through the muscle car years, but a hydraulic roller camshaft and revised cylinder heads helped to make it far more efficient than the old LS6 could ever dream of being. Forget the typical race-motor build up, Boneyard Boost was all about force feeding some tired, high-mileage workhorse we purchased for the paltry sum of $500 ($250 on half price sale weekend!). Build your own custom newsletter with the content you love from Street Muscle, directly to your inbox, absolutely FREE! Anything that will help the performance. Our acclaimed editorial staff covers all aspects of engine and driveline upgrades with a mission of presenting information that is both interesting and achievable for the average car guy. Yes, it definitely will. I fought this truck with the cats deleted and air pump disabled. So, I am contemplating upgrading this thing for more power, or selling and buying a Dmax. I have 2000 Itasca, 30 foot Class A motor home with a high mileage engine, will the ECM performance reprogramming, short the life of my engine? If it is a 1998 then yes you can. The heads used on the L29 combined the large oval intake ports with small (100 cc) combustion chambers to produce a slightly higher (than the Gen V) 9.0:1 compression. Thank you for any information you could give me. When taken together, this fairly inexpensive approach can be good for noticeable gains in fuel economy. Gains with the modifications you have done would be around 45 HP/ 45 TQ. I think I am going to swap on a good set of aftermarket heads and change out to an Edelbrock Pro Flo EFI. Subtract the standard .050-inch clearance, this leaves only enough room for a .420-inch lift cam. Check if this part fits . I like my shift points where they are. I wish we could say for sure that you will be able to see a nice gain but we try not to over-promise on that. I just put the k&N system on my truck made a huge difference in sound and performance I would deffanitly recomend spending the $250. I've installed hypertech power programmer, lower thermostat, gale banks torque tube headers and full exhaust, with hi-flow catalytic converters, shift-kit for tranny and larger external cooler. Mark McNabb was a contributor at TopSpeed from 2013 to 2018. Truck runs great doesnt miss or anything just seems to not really have any power at all in 1st gear and alittle more in second gear. At times I get a dtc for bank 1 and 2 too rich. 2019 Rodney W. Brazel Inc. - Ultra RV Products is a Division of Brazel's RV Performance, UltraPower GM / Workhorse 1998-2000 7.4L Vortec (454) Custom Tuning, within 24 hours from the order date. With the 454, putting in Vortec 350 code and chaning the displacement and enter in the tables/constants/switches appropriate to the 454 is all that is needed. Thanks. You can source the 454 HO directly from Chevrolet. 7.4 and 8.1 vortec hp and tq ratings | Diesel Place We CAN tune the engine computer with our UltraPower tuning to get more performance but we MUST have you send your PCM in to us for programming as it has a unique PCM that we don't have cores for. I would like the biggest bang for the $. 4 Bolt Main GM Factory Vortec, Edelbrock's Performer Multi-Point EFI. You would see a nice gain in power, on your 1997 we generally pick up about 30 horsepower and 35 lb-ft torque. So, what are the most common problems with the Chevy 454 Vortec? I'm sure there are other differences that would need to be addressed but you should still be able to re-use the original key and ignition harness. Most generic tuners only change very basic parameters within the computer, whereas UltraPower Tuning changes approximately 400 parameters including both engine AND transmission settings. I straight wired it to test it and it will run. Installed E3 spark plugs which seemed to help. As you can tell, it doesn't deliver much. Both Vortec 7400 heads (the '98-'01 12560241 and the '96-'01 10141279) have about 100cc chambers. It was utilized in the Chevrolet Silverado, GMC Sierra, Chevrolet Suburban, and Chevrolet Express. 454 Vortec - What happened to the horsepower? - Google Groups Is the pcm that is used a 411? We set it for the best performance in all conditions, it is not user adjustable. Also the torque management. BBK is your Number One Aftermarket Performance Brand in the USA - American Designed and Built . . Temperature measurements taken before and after the carburetor revealed that the fuel cooling dropped the intake charge temperature from 235 degrees (before the carb) down to 120 degrees (after). Then, in 2001, GM dropped the 7400 and 454 combination in favor of the final powerful big block, the 8100 496-cubic inch engine with 340 horsepower at 4,200 rpm and 455 foot-pounds of torque at 3,200 rpm. will your new part ecm work on this motorhome. Yes it would, the Banks PowerPack is helping the engine breathe better but the computer is not doing anything to take full advantage of it. Our tuning is based off of extensive dyno testing of RV's, and while results may vary, our gains are generally higher than others due to our expertise in the tuning of the L29 7.4L. Apr 14, 2016. The 454 HO crate engine boasts 438 HP and 500 lb-ft of torque. This engine has two valves per cylinder and features multi-port fuel injection. The tuning alone will be the single biggest change you can make to improve power and throttle response. Next best upgrade you can make is the Banks TorqueTube headers (, We recommend these injectors:https://www.fiveomotorsport.com/bosch-oem-454-j-code-884-black-knight/. UltraPower GM / Workhorse 7.4L (454) Custom Tuning - Brazel's RV Please contact us directly to set that up at 800-417-4559. Even better than the big peak gains was the fact that the cam swap . Yes, we could accept the PCM from your '98 as the core. 95K views 2 years ago WESTECH PERFORMANCE GROUP LETS TALK TORQUE! It has an ohv configuration with two valves per cylinder and a bore and stroke of 4.24 inches x 3 on the intake side. It can be done fairly cheap , power for days and 15-20mpg, I repeat. Is the Vehicle Control Module an ECM by another name? The Official Vortec 454 Info thread - GMT400 Switched to Mass-Air Flow. Thanks, WILL THE 2000 1 TON DULLY I HAVE STILL PASS CAL SMOG WITH THIS TUNE UP EMC. We can tune stock or modified, not a problem. The old cast-iron cylinder heads and low-rise intake manifold were dumped in favor of some aluminum PowerOval 280 heads from Trick-Flow with upgraded valvetrain and a Summit single-plane intake manifold. Parts overview- James L29 Vortec 454 build Ep2 - YouTube It will be plug and play. Maybe I need to go by the dealer and test drive a diesel or another gasser so I have a comparison. So, I am contemplating upgrading this thing for more power, or selling and buying a Dmax. Thank you. The C/K 3500's standard engine is a 5.7-liter V8 OHV 16-volt FI engine, and the 454 engine comes as an optional upgrade. After selecting a motor, we set about making the necessary changes for our test. In search of power, GM reverted to the big-block engine design, with a 454-cubic inch displacement. 496 cubic inches. What type of gains could I expect with a tune for this? This thing is weak as water. HotCars covers all things automotive: the latest auto news and informative reviews on the car, pickup truck and motorcycle industries. Precision Auto Injectors Genuine Delphi 12568155 12586557 GM Fuel Injectors Set of 6 2004-2007 GM 3.5L OHV. I am doing a cam swap on a 98 GMC K3500 7.4 comp cams telks me i will need a custom tune according to cam specs this truck is primarily used for towing plan to use stock fuel injection if posdible any info would be greatly appreciated, I have a 1996 Chevrolet K3500 what is 7.4 454. Recommended 454 TBI modifications | TBI - harristuning.com The L29 454 was originally rated at 290 hp and 440 lb-ft of torque thanks to a combination of fuel injection, large oval-port heads (to replace the peanut ports used in the previous Gen V motors) and a slightly higher static compression ratio. Our tuning is custom to your vehicle so if you ever did have a dealer flash the computer it would wipe out the performance settings and revert to stock. can you tune it Perform with these upgrades, We would like to have ordered the 7.4 custom tune ,but appearantly you are out of stock at the moment.Is there any time frame when you will have more modules.I would like to send you mine but I need my vehicle.Also we would like to have had the reasonable price. Sorry I dont have the VIN, the truck is not local, I have a 1998 2500 7.4 Vortec GMC Suburban. We've had a lot of issues with 1996 & 1997 PCM's so for the moment we are not tuning those. from your CUSTOM TUNING,ECM, J'ai l'intention d'amliorer l'ordinateur de mon VR, par un model ULTRAPOWER mais avant d'acheter, j'ai besoin de savoir quels fuel injecteurs seront le mieux adapts ( conomie et rendement ) avec le nouveau module? BBK Performance Parts 1710-XD GM VORTEC 305/350/454 80MM - ebay.com In an effort to further drop the inlet air temps, we installed a makeshift air-to-water intercooler. If so, is that the unit that sits above the radiator of a 2000 Itasca Suncruiser V32 w/ L29 7.4l (454ci) Vortec? Can you guys tune that ecm? Chevrolet Performance 454 HO 454ci/438HP Crate Engine - JEGS Its amazing what some bolt-on parts can do! Install an aftermarket windage tray in your engine. 454 L29 Power Upgrade. Switch to a lightweight synthetic oil. I have a 2000 3500 454. I am in a non emissions state My 98 GMC K2500 L29 7.4 litre has 2.5" true dual exhaust with pro Flowmax mufflers an X-Pipe, cat delete but still has both upstream and both downstream o2 sensors. Windage trays are thin, sheet metal plates that bolt to the bottom of the main caps and act as a barrier between the oil in the pan and the crankshaft counterweights. Another popular upgrade is changing to Bosch 4 hole injectors. A/T Flywheel, Hedman TEMS headers, and all the other good stuff that goes with a long block. Dyno-tested with up to 50% more airflow than restrictive factory box air filter and intake tube. I dont have the 2000 VIN only the VIN from my 1995. is this unit ready for plug and play. 7.4 Vortec Specs Chevy based the 7.4 Vortec off their 454 big block engine, hence the name 454 Vortec. This ignition system upgrade will allow you to set your distributor for a little more timing advance. The guys over at Hot Rod magazine wanted to prove its possible to make big horsepower from a Chevrolet big-block V-8 lifted from a junk1986 motorhome. Yessir! Dedicated to making your Chevy Truck bad***. I would think that u-haul did not use their own ECM. Reference core exchange, what is the time limit for you to receive the exchange? Yes, this would be the compatible ECM with your VIN and part #. This mod will not be inexpensive or simple to execute, but it will pay for itself if you do a lot of towing or drive a lot of miles. Im interested to know if you change the shift points or anything like that cause I have a shift kit in the transmission already. We can send a pre-programmed ECU on core exchange. Thanks. I am of the same opinion that the UltraPower programming is going to be by far your best "bang for the buck". Feel free to call me with your vin # handy if you would like to get your order in. If you had the proper tuning software, you could tune it yourself later. The performance chip is fully compatible with your Chevrolet Silverado 1500 in all trims, including the 2.7L, 3.0L, 4.3L, 4.8L, 5.0L, 5.3L, 5.7L, 6.0L, 6.2L and 7.4L engines. Yes, you can pay the $100 up front core charge and be refunded when you send your original back to us. The issue with your tachometer would only be fixed if there is an actual issue with your PCM. Yes, we tune for 87 octane unless a higher octane is requested. Raylar performance packages allow your 496 to produce massive amounts of power without sacrificing reliability. Vehicle Monitoring and data-logging like no other! In 1996, when all of GMs models received excellent reviews due to a new range of engines that added power, every one of its vehicles were praised by clients. Mfg Performance Parts www.straubtechnologies.com www.distributorgears.com My car is GMC pick-up 7.4L 1998. it is manual transmission. I do some pulling but mainly driving with this truck I have a factory y pipe with no cats and dual 3 inch flowmaster mufflers. A few weeks ago I bought a very low milage 454 Gen. VI L29 Vortec engine with hydraulic roller. Buy in monthly . For a better experience, please enable JavaScript in your browser before proceeding. Hi Warren, that is definitely something we can tune for. Do you have any videos of how to locate and remove my ECM? With the baby stock cam they made 290hp and 415 ft lbs of torque. Mar 20, 2011 #4 M MyBoTy Veteran Member Feb 9, 2002 1,567 Lubbock, Texas USA Thanks. GMC 7.4L/454 JET Performance Parts and Accessories We can also adjust your speedometer to be correct. Safely gain up to +35 HP and up to +5 MPG in fuel mileage in your vehicle by safely optimizing your air/fuel ratio and timing curve for increased efficiency! It is not 4x4. In 2001, production of the 7400 line was discontinued. Change to a synthetic oil that is light-weight. Our typical turn around time is 2-3 business days. But don't despair. I have the parts list and see one item called 01-412-8 hyd roller cam for $315. This is only 1 of the many changes that we make with our programming to achieve great power gains. The truck does not need to be emissions compliant. I wouldn't mind an EGR delete for the part throttle improvement and a cleaner intake, but mostly I would like to keep everything else functioning, I am looking for more torque below 3,000 rpms, ideally in the 1500-2500 range, because almost all of my driving is in that range. We can accommodate your requests for the oxygen sensors, speedometer adjustment and increased HP/TQ. We can easily do this with the specs you provide. 7.4 chevy engine in georgia boy pursuit motorhome. If you are placing an order to ship outside the United States, Shipping Insurancewill be required and added automatically at checkout. It is $495 if your sending your core/pcm in first. Following up from previous question, here is the VIN 1GDG6H1BXYJ907917 and #s off the ECM, 09384681, sev. Is it actually running at that RPM or just showing that? I have had a hard time finding much of anything for these engines. During its five years on the market, the 7400 was employed in 26-foot U-Haul trucks for commercial purposes. We immediately checked the latest 8.1L off the list due to lack of availability and parts cross over. my old part number on ecm is 16263494 on 1999 454. The same 290 horsepower that was standard for all GM cars in 1980 was maintained throughout the decade. Inexpensive and fairly easy to install, a windage tray will help to keep oil in the sump where it's supposed to be and can even help to extend bearing life by keeping the rotating assembly in balance. Check for Availability: $349.95. We are running about 2-3 days on turnaround right now. That represents a 70-percent increase in horsepower. Engineered specifically compatible with General Motors Vortec V8 engines,specifically compatible with General Motors Vortec V8 engines,Offering the quality,reliability,durability. 496 MAG Performance Parts Performance Applications Chevy / GM Trucks Thanks for any help. Thank you. Oil tends to collect on the crankshaft counterweights, adding weight to the rotating assembly (crankshaft, rods and pistons) and reducing horsepower through parasitic drag. Top 4 Best Cam For Stock 454 Big Block Review - Tools BIble It gets you an EGR blockoff plate for the Vortec 4.3/305/350 engines. I just purchased your UltraPower GM / Workhorse 1998-2000 7.4L Vortec (454) Custom Tuning. FULL RESULTS-GEN 5 454 UPGRADE-STOCK PEANUT PORT HEADS. I have a 1998 Winnebago Brave on a p30 chassis with the 7.4 with a Banks Power Pack. I have a 2000 GMC school bus with the L21 7400 motor. I tow a large fifth wheel trailer with RPMs between 1800 to 2500 typically. As long as the engine is well maintained, reliability is not affected. I've noticed a significant performance uptick, but it seems to fall flat in the upper mid-range, almost seems like it could use a MSD multi spark discharge, I don't know, but I'm considering having a dyno test to see what is happening. 800-417-4559 Jay, https://www.ultrarvproducts.com/UltraPower-GM-Workhorse-7.4L-(454)-Custom-Tuning. Could you do a downstream 02 sensor delete? You are using an out of date browser. However, this engine was developed mostly for large towing ability for CAFE-exempt passenger cars, so there is still room for improvement. watch out for chips as they just bump the fuel curve. However, Chevy still offers the 454 big block V8 as a crate engine. The 1993-or-so design FEAD has been shown the clear the factory hood. If I send yall Parts list of what kind of cam, injectors, pistons, etc. To allow the motor to rev cleanly to 6,000 rpm under boost, the cam upgrade was teamed with a new set of beehive valve springs. and will it improve my over all power? Originally Posted by PonyKiller87 Ok, sounds just like swapping over the 96-00 vortec 350 to the 0411 as far as the wiring goes. And a k and n filter. Is it not the same motor from 96 to 2001. After all, every horsepower lost to such "parasitic drag" is one less that won't be helping your truck move down the road. Makes NO permanent changes to your vehicle's computer! Seems like it's lacking power towing my boat. Edelbrock 7162 Performer 454 Cam kit can produce 540 horsepower and 530 ft-lbs torque power on a 454 engine. 2. The proper application of boost to any motor is never inexpensive, and our Vortech YSI supercharger was not what could be considered low-buck, but it was epic in its effectiveness. Buy your Chevrolet Performance 454 crate engine from JEGS High Performance today! I plan on the injector and ignition work done in march. Always a big complaint with 454 TBI trucks. Thinner oils allow the internal engine components to spin more freely and effectively, which improves their function. The UltraPower ECM performs very well on both stock engines and ones that have been upgraded with other modifications. Can I reprogram on the fly as conditions change and performance needs warrant a change?? Full Forum Listing. 1999 Crew cab dually, 454 vortec, AUTOMATIC. Without going into the engine, they make a supercharger kit for it, I know whipple use to. Chevy 5.7 Vortec Engine Performance Upgrades Since the cat removal shift points have been wonky. See listing details. And what is the final cost of your ECM. 454 MK VI (vortec) | NastyZ28.com I know they were installed in trucks from 96- 00?. I list that this RV was originally equipped with a 4.63 rear gear ratio and a tire size of 225/70R19.5. A restrictive or clogged air filter makes the engine work harder to breathe, which reduces efficiency. I THINK I want a diesel until I look at the prices. Aftermarket hood are hit and miss, we did find that the integrated airbox arrangement of the Suncoast hood played havoc with clearances that were confirmed to fit within the factory underhood bracing. $360.56. You might be able to run an L29 cam, but you will need to consult an engine builder. BBK Performance Parts 1710-XD GM VORTEC 305/350/454 80MM POWER PLUS THROTTLE BOD. It is an all-iron engine (block and heads . It's a nice cam for a 454 big block chevy engine that runs with 1500-6500 RPM Range. Do you offer anything for the 5.3? Yes, you will still pass emissions as long as you don't tamper with the existing emissions systems. Pace Performance Products in Ohio put together a decent upgrade. Thanks to a maximum impeller speed of 65,000 rpm (racers go even higher) and a peak efficiency rating of 78%, the Vortech YSI was capable of supporting over 1,200 hp at 30 psi. JavaScript is disabled. 1 cat is gone already and the other is gutted i am taking it off next week when i get a chance. Only tow rigs I have used to pull my Jeep with was this truck and my DD Driver 5.3 Tahoe. I have a 98 C-3500 dually with a Vortec 454. Headers suggested. Before adding boost, the boneyard big block was run in normally aspirated trim and produced 427 hp at 5,500 rpm and 476 lb-ft of torque at 3,900 rpm. Growing up, Mark always had a mind for tinkering on random items throughout his home and dads garage, including a 1953 Ford Mainline and 1971 Corvette Stingray. Will the UltraPower tune, give me the "best bang for my buck" performance increase? We are currently waiting on more ECM's to come in to be able to provide them on exchange. Later i want to install the banks PPB 49070 package on this motorhome next year. Naturally, the truck-based 454s. The most important changes that are made have to do with spark advance, fueling, transmission shifting and torque management settings. The 7.4 Vortec was essentially the same big block 454 that Chevrolet used to power its muscle cars, but it gained a hydraulic roller camshaft and improved cylinder heads to make it considerably more efficient than the old LS6 could ever hope for.
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