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Mercury MerCruiser 500 EFI (470-hp) | BoatTEST
https://boattest.com/engine-review/Mercury-MerCruiser/124_500-EFI-(470-hp)
500 EFI (470-hp) Brief Summary. Mercury Racing sterndrives continue to lead the marine industry with precision craftsmanship combined with state-of-the-art …
Potter On Performance: Upgrading the Mercury Racing …
https://www.speedonthewater.com/potter-on-performance-upgrading-the-mercury-racing-500-efi/
The most popular option has been to upgrade this engine to a 540-cubic-inch, 625-hp naturally aspirated package. Of course, there are other options including supercharging, which can make as much as 800 hp, but you need to …
Whipple Mercruiser Racing 1999-2005 HP 500 EFI …
https://www.cpperformance.com/p-81261-whipple-mercruiser-racing-1999-2005-hp-500-efi-stage-1-supercharger-kit.aspx
Mercruiser Racing 1999-2005 HP 500 EFI Stage 1 Supercharger Kit. Whipple Charger 500 HP EFI supercharger is the new revolutionary system that’s taken supercharging to the next level. With incredible performance and new age …
Mercury MerCruiser 525 EFI (500-hp) | BoatTEST
https://boattest.com/engine-review/Mercury-MerCruiser/123_525-EFI-(500-hp)
525 EFI (500-hp) Brief Summary This all-new sterndrive engine features custom Edelbrock aluminum cylinder heads, designed exclusively for Mercury Racing, …
Specs for an HP500 Engine - It Still Runs
https://itstillruns.com/specs-hp500-engine-7526527.html
The HP500 EFI from Mercruiser weighs 1,113 pounds and is 39 inches long, 34 inches wide and 22 inches tall. It has a bore and stroke of 4.47 inches by four inches, along with a multiport fuel injection system featuring a high-flow throttle body to increase horsepower and a tuned intake manifold to provide a better fuel/air mixture.
Offshoreonly.com - Mercury Racing blue motors: 500EFI, 525 EFI, …
https://www.offshoreonly.com/forums/general-q/242108-mercury-racing-blue-motors-500efi-525-efi-575-sci-pros-cons-maintenance-etc-print.html
- - Mercury Racing blue motors: 500EFI, 525 EFI, 575 SCI. ... nearly 800 hp, carbed and custom built (not merc). She starts, runs and shifts flawlessly, my engine will shift around the dock at nearly 500 rpms and never stalls; it lumps along with the cam profile beautifully. ... Many parts are now "obsolete" and no longer stocked by Merc for ...
Life expectancy of the mer HP 500 EFI - iboats Boating Forums
https://forums.iboats.com/threads/life-expectancy-of-the-mer-hp-500-efi.649600/
Need top end refreshed every 200 to 300 hours just as the 525 and 575. Around 600 plus hours they start getting tired and need a rebuild. Main issues folks have had is with the Merc headers, Merc are crud. Need to have CMI or better headers installed to …
Merc HP 500 question??? | River Daves Place
https://www.riverdavesplace.com/forums/threads/merc-hp-500-question.38322/
MerCruiser HP 525 EFI/Bravo I/SS Prop/500 HP MerCruiser MX 6.2L/Bravo I/SS Prop/320 HP This makes it look like the HP500 has 470 hp at the prop. Those exhaust manifolds are the same as I had on my 500s, must have been stock back then. ... As I recall, those early Merc Racing engines used Gil aluminum manifolds from the factory. I know thats ...
Merc 525 vs Merc 500 HP - Performance Boats Forum
https://www.performanceboats.com/threads/merc-525-vs-merc-500-hp.63612/
412 Posts. #10 · Apr 28, 2010. Only show this user. Whipple has a kit for the 525, you just can't use the Merc ECU. You need to switch to a MEFI or similar. The 525 is a great platform to build off of. The old carb HP500 is a 540 instead of a 502 and makes a great platform as well, but hasn't been made for years.
HP 500 EFI Valve spring cost - Powerboat Forums at SpeedWake
https://www.speedwake.com/threads/hp-500-efi-valve-spring-cost.23001/
He was a response I got from Mercury Racing Division: Join Date: Oct 2000 Location: PGH, PA & the boat @ Port Deposit Posts: 689 Re: MYTHBUSTERS.....On 500EFI valve springs -----PS.talked to the people at Merc HP today. (finally got a response)and they say they have nothing in writing about replacing valve springs.
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