Mercruiser 454 hp. View and Download MerCruiser 454 MAGNUM manual online.

Mercruiser 454 hp Thanks much ! Reply Aug 9, 2023 · MerCruiser 454 - 7. I am very pleased with the boat's performance, but would like just a little more "ooomph" out of the holeshot. $7,300. 4L) LH: 410 hp: Gen VI Roller Jun 6, 2006 · The 400 cylones were from 80-86. Aug 11, 2011 · I am having performance issues with a mercruiser 454 magnum (1989 engine, 365 hp). Mercruiser Spark Plugs: 454 MAG 454 Mag Bravo V8: Sterndrive 8: CHA-RV15YC4 NGK-UR4: 0. in. Some one has apparently replaced the carb. There does not seem to be any pattern as to which ones did and which ones had forged. 4L/454; The 8. Now, the 496 mag replaces the 454 mag, and the 496 HO replaces the 502 mag for near equivalent HP. They came with forged internals, roller rockers, and log manifolds, quadrajet. Those are all good platforms to modify, not to mention they are all quite a bit more hp to start with than your 330 hp. The advertisement said it only has 300 horsepower, I figure it probably has closer to 310 or 315 judging by other ads for boats with the same engine. bravo (gen. Jan 8, 2011 · If you want to add more than 30-40 hp, then it's probably better to start over. He was only asking me what cam I wanted to run and I said whatever the STOCK spec is for a 1992 Mercruiser 454. 40-50% HP Mar 30, 2004 · I am brand new to performance powerboating, and just picked up a 1997 Mariah Z 255 Shabah last month. 4L MPI Specifications Propshaft Horsepower: 310 (232 kW) Displacement (Liter/CID): 7. Sterndrive Engineering Replacement Lower Unit Mercruiser R, MR, and Alpha One 90-106-02 Replaces R, MR, Alpha One lowers from 1972-1990 13 Spline Driveshaft Tooth count is 13-21 Up to 300 HP 90-108-02 To replace Counter Rotation units Choose Options Aug 30, 2015 · hello iboats well am back again . hyd cam flat tappet with about 236/244 @. I've asked here about the history of the 454 due to its outstanding design and performance in a marine engine application but haven't gotten much response. 00 Add to cart; 2001 MERCRUISER Bravo 1 STERNDRIVE COMPLETE OUTDRIVE FRESHWATER USED 1. Gen 5-6. Good luck. N. may affect the consumption figures. 4L/454 You will also find a listing of technical articles covering important boating topics such engine ooil capacity, intake manifold fastener torque on models such as the Mercruiser 454 and 3. 325 2761141 and Below; GM V-8 427, 454 & 482 cid V8: N19V Jan 3, 2007 · Nothing real exotic, just good quality basic materials. 14 watching. 1L family of Marine Engines in 2010 Mercruiser developed their family of In-House designed Marine Intent 8. 00; Chevy 454 / 450 HP High Performance Balanced Crate Engine $ 5,195. Jan 15, 2012 · . 0l carb alpha/bravo - 0m600000 thru 0w300009; 5. 411MarineCom Inc (6223) Mercruiser 454 Complete Inboard Gas Engines, Set Automotive Harmonic Balancer Pullers, MerCruiser 454/502 Magnum (carbureted) MerCruiser HP 500 and older HP motors (carbureted) 454 and 502 Magnum engines are excellent candidates for supercharging. 4L, 454 CID Gen VI marine engine longblock. For example, a 420 hp 454 marine engine will run around $5000 for the long block. 91. even when i drop down to a Sep 27, 2010 · MerCruiser sterndrive manuals OMC sterndrive manuals Volvo Penta Oil or gas sheen in exhaust water 1986 350 hp 454. 7/350 (250/280 HP) 7. Technicians enhance the performance of the stock 454 GM block by using high flow cylinder heads with enlarged intake ports that improve air flow throughout the engine. Maybe I have bad inputs to DTDyno. 4L / 502 CID / 8. GENUINE NEW MerCruiser 496ci (High Output) 425 HP Complete drop-in (BOBTAIL) engine. Jul 29, 2008 · This question doesn't have an exact answer, because it varies with year model. 4L (454 ci) engines (can be modified to work in most OMC, Volvo Penta, Crusader, inboard, etc. It actually got on plane much easier even with the bigger prop. Whipple 3. i want more rpm. This is due not only to a moderate compression ratio, but also very rugged components: forged pistons, a steel crank, and a four bolt main. in the configuration from them. Exhaust has already been upgraded. Both oif these engine models are easy to recognize by the large “Bread Box” style intake plenum mounted directly on top of the engine. 060 forged pistons 9. 4 L 340 h. v 450 hp v-8 0f347100 thru 0f347277: 7. Boat for this engine is a 1989 Baja Sunsport 210 (21', about 2800 lbs dry, shallow vee hull, open bow). vi v-8 0f820000 thru 0k999999: 7. at the best online prices at eBay! Free shipping for many products! Sep 19, 2012 · Re: 1993 7. Lb. My biggest concern with it would be corrosion from raw water running through it. I cannot remember the exact RPM rating, maybe 44-4800. 0l carb alpha/bravo - 0w310000 thru 0w649999 Parts for MerCruiser 454 Mag. Sep 6, 2005 · I did find in my grandfathers garage next to the motors 2 air intakes - stainless boat air filters that say mercruiser 420 on them - did merc make a 454 in 1990 or 1991 with 420 hp - because it would not surprise me a bit if these motors were mercruiser - they probably bought a ton of these LS6 motors since Chevy had thousands of them ready for 1971 production vettes - they switched to a When you employ this ECU chip on your Mercruiser 454 MPI, you will obtain better horsepower through the Intake Air Temperature Sensor signal of the stock IAT /MAP/ MAF Sensor. 4/454 engines used the final designed gen 6 for most if not all of the production run. Chevy 383 / 425 HP 4 Bolt Aluminum Heads Hi-perf Balanced Crate Engine $ 4,995. 460/. 4L/454 Cylinders: V-8 Bore & Stroke (inches/mm): 4. Disregard my signature at the bottom, my new boat is a 2000 Powerquest 260, with 454 Mag MPI - 0L611921. Factors such as propeller pitch, weight, hull / water conditions, etc. 4L engines. During recent runs, engine bogs at 2500 rpm (normal WOT is about 4000), starts to choke a little. And any of these engines can be fitted with closed cooling- the kits run about $1000 from San Juan, Monitor etc. Had a lot of conversations with other owners and same set up. good rod bolts, a ported set of 049/781 cast heads performer rpm int, jetted q-jet carb or holley 850cfm. mpi horizon (gen. 4l 454 cid mag. After General Motors discontinued the 8. what i did was at idle speed 700 rpm i just set the timing at 8 btdc and lock the distributor down, the problem am having is, with load it will not go past 3800 rpm . Sep 22, 2010 · Some of the lower HP Mercruiser engines had Hypereutectic pistons in them. Pre-Owned. 4L MAG (330 HP) Other Marine VOLVO CUSTOM APPLICATIONS UNIVERSAL. Feb 3, 2006 · THIS WAS IN POWERBOAT MAG JAN ISSUE PROVEN 7. "SS" Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines. There are very few mods to improve it. Jan 7, 2025 · General Q & A - 454/425hp mercruiser - Hi everyone, Have 1990 Baja 370es from 2012 with twin Mercruiser 454/425hp ''performance series'' for this year, this week need refresh engine but i think both engine have already been redone but don't think with original parts !bore . Powerful, smart, and virtually maintenance-free, this state-of-the-art big 454 MAG 392 Hp Power Package (No Longer Available) This Power-Pack is the perfect repower option for pre-1992 base 7. A V-8 of this size can easily be setup to generate in excess of 500 horsepower. 2L Big Block V8 Inboard Engines. Go (800) 209-9624 M-F 9-5 ET Mar 27, 2006 · General Q & A - "330hp" Merc 454 carb - anyone have dyno data? - I'm trying to calibrate my DT Dyno models. On a small block, sure you can throw the 454 TBI and injectors on and build a little more, but with the 454 you are limited in what you can improve. My boat tops out around 60mph and I want to do some upgrades to get that speed up. Oct 11, 2007 · Hello, Well after my 22' 1988 Boston Whaler Temptation with a Mercruiser 454 BBC 330 hp Carburated , generation 4 , ThunderBolt ignition had just died out in the harbor, I pulled it out and I am working on it in the driveway. Dec 7, 2009 · It came with a stock mercruiser MCM 7. MerCruiser 454 MAG MPI Specifications (2012 Model)(Contact us for latest model information) Propshaft Horsepower: 385 (288 kW) Displacement (Liter/CID): 7. 2L. 4L BRAVO (GEN. 4L MPI, and the 385 Hp 454 Magnum MPI Sterndrive Model and 380 Hp 7. That serial is a 7. 1L makes about the same Hp and more Torque than the 385 Hp 454 Mag. 4L 454 cid V8 (330 HP)MPI ENGINES. The mag has forged internals, a high rise intake and a different valve train and cam. Jun 15, 2017 · 1995 454 mag was 365 horsepower. 6:1 comp and 385 hp. 00 Add to cart; Hot Rod Gen4 454 1970 - 1990 2 piece rear main seal, Serious Street Use Only! 383 CID CHEVROLET ENGINE ALUMINUM HEADS COMPLETE PERFORMANCE MARINE CHEVY 350 Jul 5, 2005 · General Q & A - 454 MPI 310HP what can i do for more HP - Hey what can i do to give me about 500 H. 00/108 x Aug 20, 2003 · General Q & A - Mercruiser 454/330 questions - Anyone know the specs on a '91-ish Mercruiser 454/330? Compression ratio? Piston, crank, rod type? (Forged, cast, hypereutectic) Cylinder head intake runner volume (I assume they are oval port) Cylinder head chamber volume Thanks. 4 Mercruiser Engine Life Expectancy If it is now or ever has been seriously overpropped, deduct 1500 to 2000 hours from that realistic 3000 hours bondo mentioned. These would be the "entry" level Xrteme Marine Hydraulic Flt Tappet cam. 8002 West 6th Stillwater, OK 74074. You could get the 454 mag efi, but it came with Latham, and on the carb 454 mag, they recommended latham. I'd guess that you have the 7. Lookup MerCruiser 7. 4L (330) and the new Magnum was the old 370TRS motor now rated at 365 hp. Sorry that this may not be what you want to hear. 050 and lobe center. can really Apr 22, 2024 · LS-6 454. I cannot and will not warranty anything other than my work. 4L (300/330 HP) 7. Apr 6, 2010 · Talk to the guys at US Engines and ask them about what they do to their 450hp Mercruiser 454. While it isn't a race boat, I still want to get every HP and MPH I can. Mercruiser 454 Magnum MPI Models . 4l 454 cid gen. The boat is powered by the "plain jane" Mercruiser 454 (carb and not the "Mag") and is coupled to a Bravo III outdrive. No superchargers (I think) Who has the proven combination? May 17, 2007 · I have a Baja Boss Hammer with a 454 Mercruiser MPI and a Bravo one drive. running temp with 160 thermostat is now right at or about 160 at 2500-3000 rpm in the water . Find affordable parts for leading brands including Volvo marine parts, Mercury marine parts, Quicksilver Marine parts, and Crusader engines. engines Not knowing your serial numbers and not being able to see what your looking at I'll add the following: There were two different thermostat(TS) housing made during 1981 and 1987 for the 340hp inboards. 4 - 330 350 HP Harmonic Balancer. You may want to look for a take out 454 or 502 mag or a 500 hp. 4:1 fuel system 4 bbl holley ignition delco electronic full throttle operation (carbureted) 4000 - 4400 rotation (flywheel) (opposite rotation available on sportpac only) ccw/cw transmission - sportpac only Jan 16, 2017 · That certainly makes the crankshaft HP higher (and some estimate about 10% is lost in the drive) so it's somewhere around 330 crankshaft hp. Alternator Brace to Alternator Find many great new & used options and get the best deals for MerCruiser 454 Engine L29 MPI or Carbureted 310 Hp. Hardened exhaust valve seat inserts are more tolerant of low lead fuels, improving reliability and engine life. Used a Weiand 177 blower with a Holley 1050 Dominator at 5 lbs of boost for 525 hp, add a chiller and change the pulley and you are at 600 hp (+ - ). 87 Mercury Marine MerCruiser 7. L-29, oval intake, no heat crossover. Actually, one is a crate 425HP, and the other is a 400 cylone that was supposedly rebuilt to 420 specs. I'd be more inclined to gen 5 given carbureted. v) gm 454 v-8 1992-1996 engine & stern drive by component and buy discount parts from our large online inventory. 1 $ 15,700. or Best Offer. 515" Mar 2, 2004 · In 1987 ONLY. 0l (2 bbl. This 496ci MPI NEW engine is made for sterndrive MerCruiser applications (Bravo outdrives). 04 Mercruiser: Spark Plugs 454 MAG: 460 Cyclone V8 Sterndrive: 8 CHA-V63C: NGK View and Download MerCruiser 454 MAGNUM manual online. Apr 24, 2013 · I am looking for some advice for an intake, cam, and carb for a 1995 baja 240 mercruiser 454. 00; Chevy 383 / 350 HP 4 Bolt Performance TBI Balanced Crate Engine Truck Camaro $ 4,395. Opens in a new window or tab. Specs are Duration @. 4 was rated at 330. Pre-Owned · Mercury. MerCruiser sterndrive and inboard engines bring your biggest adventures within reach, with quiet, powerful, efficient performance and SmartCraft® digital technologies that make your favorite on-water activities even easier. But they didn't ALL break. , applications). 4/330 horsepower camshaft is an old design camshaft from the 60's with 213/217 duration . 454 cid specifications standard displacement (liter/cid) 7. vi) gm 454 v-8 engine & stern drive by serial number range and buy discount parts from our large online inventory. Do you want quicker acceleration, faster planing, and increased performance of up to 15 HP? If so, the "SS" Super Sport tuning kit for your MerCruiser Magnum MPI engine is what you need. Apr 19, 2007 · Also, the mag requires thru hull exhaust. The 420HP had the same longblock, except for crane gold rockers, weiand intake, holley 800 carb, and hi-perf merc manifolds, or gil manifolds, and were from 86-89 I believe. Mercs mpi 7. 04: Mercruiser Spark Plugs: 454 MAG 454 Mag MPI V8: Sterndrive 8: CHA-RV15YC4 NGK-UR4: 0. using your block, crank, rods done many over the years, best bang for the buck. If you’re replacing a base 7. Bravo (Gen. The spacer is a 4 hole which was standard. Go important_devices MerCruiser's 454 MAG MPI cranks out a potent 385 propshaft horsepower. i'm flat out getting 4000 loaded or not. 45-65% HP Increase; Extremely powerful, durable and efficient M-3 ProCharger; Massive integrated air-to-water AW-504 intercooler; Exclusive torque curve for compatibility with stock Bravo’s Generates power in line with your ability to use it; Great for modified applications also (up to 1,200 hp) Intercooled M-1 Procharger System. mpi bravo (gen vi) gm 454 v-8 - 0l085400 thru 0m024999; 5. Oct 30, 2006 · Re: 7. v v-8 0f800700 thru 0k999999: 7. DESCRIPTION Lb. Both used 140 degree TS but plumbing was different. msd58 Aug 9, 2013 · Re: A couple of questions re: 1986 mercruiser 454 7. or Best Offer +$500. Apr 23, 2023 · Agree w/t. I would appreciate any suggestions on engine modifications that I could do to boost hp and performance. P I have a few external bolt on stuff which im sure has givin me a bit more than 310 Hp first i added a K&N air filter then i added a jacobs ignition system theni just bought a set of dana flo headers. Equipped with a complete fuel system as well as the ignition system. The engines currently have 496 HO MerCruiser Complete Engine Package 425 hp - Sterndrive. 454 ; Search Inboard Engine Parts by Horsepower 260; 340; 370; "SS" Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines. Dec 8, 2009 · I have a 23' Mach 1 with a 1996 454/330hp and bravo 1 spinning a 23p Mirage to about 4800 rpm and a consistent 58 mph GPS if that helps any. In. MERCRUISER : 7. I cannot see how a Merc 330hp 454 can actually make 330hp. 00 Jan 21, 2006 · General Q & A - 454 MPI MAG upgrades - Ok, want 550 Hp and factory looks out of my 454 Mag Mpi's. Large selection of quality mercruiser parts, marine engines, marine parts, boats parts and accessories, such as Mercuiser engines, exhaust, motors, and other boating supplies and accessories. 4 Liter supercharger, cupronickel intercooler, MEFI ECM recalibration and all the hardware needed for a simple installation. 4L (454 ci) Vortec marine engine (1991 and later) MerCruiser. v) gm 454 v-8 1992-1994 engine & stern drive by serial number range and buy discount parts from our large online inventory. 4l bravo (gen. This complete engine package is designed to replace most 1986 and later MerCruiser 7. 4 CARB UPGRADE QUESTION: A few years ago you listed an intake, cam and head combination for upgrading a stock MerCruiser 454, 330-horsepower engine (mine is a 1987 model) that was good for up to 425 to 450 horsepower, if I remember correctly. IE: MPI intake, their exhaust and tuning, etc. 4l / 454 cylinders v-8 bore & stroke (inches) 4. Such as timing, spark plug type, plug gap, idle RPM, etc. Eddie Jun 8, 2003 · 300 HP Oval port 150 comp I think I gave you guys a bad impression of the builder. The 454 MPI came in 2 different Hp version’s being the 330Hp model which was known as the 7. $7,200. Sep 2, 2008 · The motor is a stock '91 Mercruiser 454 carb (330hp), 700hours. Nov 9, 2005 · General Q & A - 454/420Hp build up - Right now in my excalibur Hawk I have twin 454/420 mercs. p. 050" lift - 218* Intake / 224* Exhaust. You can find all the specs in the Merc HP service manual at any Merc service dealer. V) GM 454 V-8 1992-1994 Carburetor (Weber) Mercruiser Carb 454 MAG (350/380 HP) 5. On the verge of moving forward with having my two 1986 Crusader 454/350's rebuilt and putting mild performance cams from CompCam. 4 L 454 340 HP CCW inboard boat Engine motor. . It looks like Jun 7, 2007 · i have a mpi 454 mercruiser. m. He reused the stock GM cast cranks (turned 10/10), reused the stock 3/8" rods (shot peened, reconditioned, and added ARP rod bolts), new cast pistons (told him to go with forged pistons, but he didn't), replaced the stock cams with some higher HP cams (flat tappet hydraulic cams), roller rocker arms Mercruiser Big V8 Marine Engine Fastener Torque Spec’s. Jan 11, 2009 · Just for reference, if it was a Mercruiser 454 Mag. May 24, 2010 · To put it in perspective going from a 300hp 350 to the 310hp 454 my Chapparal picked up 4mph just due to the fact I could run a larger prop and still get on plane due to the extra torque even though both engines made same hp. 4L (310 or 330 Hp) engine you’re pretty much out of luck because the lowest Hp version of the 8. $500. Nov 30, 2010 · Motor is stock accept for I added the 454 mag fuel injection, I will do a three angle valve job, bronze guides and pocket work to the stock heads. 4 454 mercruiser engine gen6 454 mag 400 hp marine replacment dyno tested. I did try a 23p Hydro last summer and got 61-62 but had low rpms at about 4300 and the boat ran very flat. The boat is a Formula 242LS. Mine with the 350 mag(250 prop HP) ran at around 60-63 GPS at 4800 RPM. Remanufactured. mpi gen vi v-8 0l010029 7. 4 Cylinder (Inline 4) 6 Cylinder (V6) Rated approximately 330 HP with four-barrel carburetor Jul 12, 2016 · 1994 Baja 272 with a 454 Mercruiser . Mercruiser Inboard Engine OEM parts for sale. 4 (300 prop HP) as available, and the carb 454 mag (350 prop HP) available. 454 MAGNUM engine pdf manual download. 4 300 HP. 00. And most importantly the cam specs lift /duration at . Mercruiser – OMC – Volvo – Penta – Chrysler – Chevrolet Chris Craft – Commander Crusader – Ford – Glasstron 454 (7. Heart shaped combustion chamber, 7/16 inch mounting holes in heads. Bolt on supercharger kit for the 1993-2001 Mercury Marine 454/502 Magnum MPI engine family. 1 cr. I also would like to get some where between 75 to 100 hp from the cam and head work. 4l 454 cid sc gen vi 525hp 0k000012 thru 0l415623: 7. I need to do a tune up on it and I would like to know the entire tune up specs. by the way it is in a jetboat, hamilton 212 unit. The cylone engine was down on rpm this past season. Released the same year as the LS-5, the LS-6 was the top dog as far as stock 454 hp went. They are the 385 hp models. He simply said that I should find out and let him know since he does not have the specs available. The 454 Magnum was just a 330. V) GM 454 V-8 1992-1996 Model Serial Ranges. 4L/8. Also, adding additional HP increases - boost - is not recommended for the lower HP engine. 00; Ford 351 Windsor 345 HP High Performance Balanced Crate Engine $ 4,495. They were marketed by Merc with the standard Bravo drive. Rochester quadrajet carb, outdrive is Bravo I, has transom exhaust. 4L applications or for even for 1992 and up applications looking to upgrade from a 310/330HP 7. 4 L 454 340 HP CW inboard boat Engine motor. While the 454 was used in high-horsepower cars such as the Corvette and Chevelle, the Chevy 454 automobile engine made 330 horsepower stock. 0D603118 THRU 0F800699 +1 (405) 533-3812. 36 $ 2,100. They usually get eaten up pretty good and given it is a GenV it could be as much as 20 years old. They are supposed to be a direct replacement for the Weber Y43 carburetor on my engine. . 300 hp Discontinoued? There are plenty of places that can sell you a new or rebuilt marine 454, ranging from about 300 hp on up. 7. ebasicpower. Ft. 4lx 454 cid tbi gen. In 1988 The '87 Magnum was now the 7. Buy It Now. 4l bravo gm 454 v-8 1988-1991 engine & stern drive by serial number range and buy discount parts from our large online inventory. So, if anyone has actual dyno results for a 330hp rated Merc 454 (or 310hp Oct 23, 2019 · Thanks for all the help over the years. This engine is Remanufactured, All components are 100% brand new and include a 1-year factory warranty . 4 litre bravo 454 in it. A cruiser would be more fitting for the std 454. 4l 454 cid 425 hp v-8 0a398941 thru 0d937011: 7. 4L Mercruiser / Bravo 1 (300 HP) 600 CFM or 750 CFM Carburetor Edelbrock only offers a 600 cfm and a 750 cfm in marine configuration. Drill down to the horsepower 7. 95 shipping & competitive prices. 480 lift 114 LSA. Gonzalo emailed us the following follow up, Good day, I am satisfied with the communication, the Dyno-Boost Boat Performance Chip and the shipping and i hope in future mecruiser twin inboard 454/340 hp with trans velvet drive ratio 1. It ran well, but not that much power. Flat $4. How in the world did they get MerCruiser 454/502 Magnum (carbureted) 454 and 502 Magnum engines are excellent candidates for supercharging. 4L MPI 454 cid V8 Remanufactured 279 HEAD [BPIH6036] - Remanufactured Cylinder Head for GM 7. Completely remanufactured 7. 25 x 4. Head Kits Include: High quality seals Bake cleaned and shot blasted 3-angled cut on valve seats 100% 87 Mercury Marine MerCruiser 7. Chevy's parent company, General Motors, adapted the 454 automobile engine into the 330-horsepower, 454 marine engine. 2L engine specifically to replace the base 7. com Marine Cylinder Head GM 7. 7L engines. Would like to know what compression thay had and size carb. 035 Mercruiser: Spark Plugs 454 MAG: 454 Mag EFI/MP V8 Sterndrive: 8 CHA-RV15YC4: NGK-UR4 0. 4l 454 cid 420hp v-8 0a398941 thru 0b622418: 7. Found in the 1970 Chevelle SS 454, it provided the owner with 450 horsepower and the same earth twisting 500 lb-ft of torque. Also for: 502 magnum. Thread starter alan_in_vt; Start date Sep 27 Champion Spark Plugs for Mercruiser Inboard Motors. The TRUE 454 magnum was rated at either 360 or 365 horsepower at the flywheel while the 7. Recreational Engines - Ready, set, fun. 00 shipping. mercruiser 454 head and cam info Mar 16, 2005 · Keep in mind the 454 TBI will not support that higher power 454. I seem to have lost spark, when I push the throttle I do see gas Aug 11, 2005 · General Q & A - Mercruiser 420 HP specs. just make sure to have zinc additive for the cam, power under 5500rpm. 0l carb alpha/bravo - 0w300010 thru 0w309999; 5. more faster. 1160 hours on engine. He would have to take full responsiblility for condition of the engines. Head Casting # 279. Valve lift 505" Intake / . 350 hp and Bravo 1 . Aug 21, 2006 · Engine is 1986 model mercruiser MIE 340 big block with quadrajet carb. 44 watchers. Then I found another posting that showed Mercruiser engine power ratings from years ago. Lookup MerCruiser 454 mag. 4mpi with 310 HP, the 454 mag with injection produced 385 HP. Now having said that, Mercruiser DID intentionally install the Alpha on the back of the 454 until the Bravo was available and some of them DID have problems. 00 compression ratio 8. Jan 13, 2014 · Usually you would see the 454 Mag on go-fast boats that can take advantage of the higher RPM. Lookup MerCruiser 330 gm 454 v-8 1977-1981 engine & stern drive by component and buy discount parts from our large online inventory. 454 mag mpi bravo (gen vi) gm 454 v-8 1998 - 0l010029 thru 0l058399; 454 mag. ) gm 305 v-8 1998-2001 - 0l015751 thru 0m599999; 5. Nov 10, 2003 · The Baja catalog for 1995 lists the 7. All of the 454 Magnums in 1987 had an Alpha drive. I was told I had peanut port heads and may not have a roller cam. Mercruiser tried to deal with this by introducing the 6. I will also be using imco power flo exhaust to help it breath I hope to get 40 to 50 hp from the exhaust. Jan 18, 2008 · My cousin has a 1988 32' Baja with a pair of stock Merc 330's that he upgraded on a low budget. Mar 19, 2003 · MerCruiser 7. Maybe DTDyno is not accurate. 454 CID / 7. 4L Magnum MPI. 020, have head casting 14096188, roller Dec 28, 2023 · General Boating Discussion - Tell me more about the 425 hp 454 engines - I was intrigued by a recent thread where the poster showed pics of his new-to-him boat that had twin 425 hp 454 cid engines. There IS IN FACT more horsepower difference between these two engines than the horsepower rating suggests, BUT that's a different issue. Sep 22, 2004 · 1) Buy a pair of brand new Mercruiser engines, (496HO, HP500efi, HP525) 2) Buy a pair of used Mercruiser engines, (454 mag, 502 mag, HP's) with low hours. i want to know the correct way for timing my 454 mercruiser. 1L Inboard engine was offered in both the 380 Hp version base model as well as the 420 Hp High Output Model. 2. 2L Torque Specifications . It did not hold up to the big block and the Bravo was born in 1988 Feb 17, 2010 · mercruiser 420 horse engine specs?? Does any one know the engine specs on a 1989 420 horsepower mercruiser? I know thay are 454 with i think square port heads. Mine is a 1999 and is a 7. Freight. Feb 26, 2014 · The flat lifter 7. brand new 454 long motor, standard) what controlls max rpm? EFI box says max rpm 4000-47000. To make a good hp increase the changes would be mostly what you Mar 21, 2012 · The EFI 502 went up to 415 at the prop and the 454 Mag went to 385 hp at the prop Somewhere I have a spreadsheet of all the Merc stern drives and Mercury Racing (Formerly Mercury HiPerformance) which lists the displacement, HP ratings, years produced, etc. Oct 26, 2009 · Re: Mercruiser 454 cu. It has the Mercruiser 420HP 454. (or just about any good machine shop) It will take a comp ratio increase, different (marine) cam and maybe a stoker crank and it may have to run over 5000 RPM to make that HP. The only components that are remanufactured in this assembly is the engine block, cylinder heads, crankshaft, and connecting rods. Just purchased this past fall with around 450 hours, freshwater only. We also have several articles covering the ever-important topic of Propeller Fundamentals. $6,800. - I just bought a 1978 23ft Seacraft Seavette. The longblock comes assembled with all internal components, cylinder heads, and gasket kit and oil pump. it was 8. 050 and a good log exhaust 480 /500 hp. is it ecm or something else?? very tempted to go carb. 4L to the higher HP and higher torque 454 MAG 392 HP engine. 4 which means oval port and cast internals. (efi component about 96model VST, MEFI1,. xun bryzmu monkj lhjvo gpdn kyydu pxnl qbpr hmpqvyg kokk