Stock 502 EFI engines
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Stock 502 EFI engines
I am sure this question has been beatin to death on is board, however I am new at this marine stuff and just purchased a 35 lightening with 2004 stock merc 502 EFI. Is there any simple upgrades available to boost HP. I have been told be careful because some of the internal compnents may not be able to handle any extra power. They are suppose to be 415 HP from factory. Any info would be great.
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Re: Stock 502 EFI engines
Originally Posted by tanner
Is there any simple upgrades available to boost HP.
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Re: Stock 502 EFI engines
Also, Any mods you do will have to work in conjunction with the computer for that engine. Tyler Crocket has an excellent up-grade package for the Merc 502MPI that includes surfacing the heads, larger stainless valves, valve job, roller rocker arm conversion, hydraulic roller cam upgrade, CMI headers and computer mods---good for about 100hp per engine........or you can go with a Vortec supercharger kit or something comparable. Either way it will cost THOU$AND$.