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Mercury MerCruiser 500 EFI (470-hp) | BoatTEST
https://boattest.com/engine-review/Mercury-MerCruiser/124_500-EFI-(470-hp)
Potter On Performance: Upgrading the Mercury Racing 500 EFI
https://www.speedonthewater.com/potter-on-performance-upgrading-the-mercury-racing-500-efi/
One of the most popular engines Mercury Racing ever built was the 500 EFI. This engine has been used in a wide variety of vessels from family sportboats to multi-engine poker run boats—and even offshore racers. As …
Merc 500efi top end refresh | River Daves Place
https://www.riverdavesplace.com/forums/threads/merc-500efi-top-end-refresh.145965/
Reaction score. 28,762. I would say you could have the the heads freshened up with new seals, springs and valves / valve job and guides checked for $1200 or so. Then you have the cost of labor to remove / replace heads, cost of gaskets, etc.... I think most shops charge somewhere around $100 an hour for labor.
Mercury MerCruiser 525 EFI (500-hp) | BoatTEST
https://boattest.com/engine-review/Mercury-MerCruiser/123_525-EFI-(500-hp)
Key Features. Precision CNC machined 502 C.I.D. cast iron cylinder block. Advanced, factory installed closed-cooling system features five-year coolant …
Offshoreonly.com - Mercury Racing blue motors: 500EFI, 525 ...
https://www.offshoreonly.com/forums/general-q/242108-mercury-racing-blue-motors-500efi-525-efi-575-sci-pros-cons-maintenance-etc-print.html
500 EFI - basically no problems except some (rare) had head gasket leaks -that may have been from too high water pressure due to LWP B1 drives that debuted about the same time. On a Fountain with a pair of 500 EFI's and LWP B1's it was easy to develop 35+ psi water pressure ... merc made a blowoff valve kit that could be installed to limit pressure.
Offshoreonly.com - Mercury Racing blue motors: 500EFI, 525 ...
https://www.offshoreonly.com/forums/general-q/242108-mercury-racing-blue-motors-500efi-525-efi-575-sci-pros-cons-maintenance-etc-2-print.html
Plan on doing changes at no more then 25 hour intervals. The 525 EFI is a great motor. The block is CNC machined, it has steel H-beam rods, forged pistons, aluminum heads, top quality valve train components, the hottest cam of any N/A Mercury Racing engine, Cometic head gaskets (later models) and on and on.
Life expectancy of the mer HP 500 EFI | Boating Forum ...
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 …
Mercury Racing 540 Replacing 525 EFI - boats.com
https://www.boats.com/reviews/mercury-racing-540-replacing-525-efi/
The 540 engine is replacing Mercury Racing’s venerable 525 EFI powerplant. Without question, the 525 EFI was one of the most successful models in the history of the Fond Du Lac, Wis., high-performance marine engine company. But the release of the new Mercury Racing 540 at this year's Miami International Boat Show spelled the end of the line ...
Merc 525 vs Merc 500 HP | Performance Boats Forum
https://www.performanceboats.com/threads/merc-525-vs-merc-500-hp.63612/
There were two versions of the HP 500 carbed. The HP500 Bulldog was the 540 ci and was indestructable. The HP500 was a 502 ci and suffered valve spring problems after a couple of hundred hours. New springs, and they were a great motor. The 500 EFI had far fewer valve problems. All were rated at 470 hp.
Mercury Racing 500 EFI Startup And Idle - YouTube
https://www.youtube.com/watch?v=I6KM33J4HFA
This is a short start up and walk around of my Mercury Racing 500 EFI.
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