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502 upgrade

Old 09-25-2019, 12:28 PM
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Default 502 upgrade

Which way would you go. I have two newer 502 mag mpi's. I'm either going to pull them and sell them complete or build them. What the best bang for the buck? Build these or sell and put new drop ins. Think about going to twin 540s carb motors.
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Old 09-25-2019, 02:21 PM
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I can tell you that there is no comparison between the two as far as performance goes. So if you are looking for a drastic performance difference, carbed 540’s are the way to go. I would sell the 502’s complete and build the new power from scratch. It won’t be cheap to do things right but selling the old motors and drives will offset some of the pain. I gained over 15 mph in a usually overloaded family boat and my build is very conservative (wet exhaust) single engine.Good luck
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Old 09-25-2019, 02:27 PM
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The only thing reusable are the blocks, IMO there worth about 10-13k for the pair and you will blow through that in an instant building a pair of 540's, so ya betta have a bunch of cash to finish them.
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Old 09-25-2019, 02:52 PM
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I figured if i sell them both it covers the one motor. The other is out of my pocket.
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Old 09-26-2019, 10:07 AM
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What are your HP goals? Ateco might be worth a call. They will take your 502 mpi and turn it into a 540 , 595 HP MPI for as they advertise for about 13k (plus headers)

https://atecoengines.com/
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Old 09-26-2019, 12:11 PM
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I was thinking about putting two of these in and selling my 502s. These seem to be a better deal than a rebuild for 12k each. Thoughts ?
https://www.summitracing.com/parts/mll-psm5400ctc1/
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Old 09-26-2019, 12:19 PM
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Interesting. I look at the Blueprint stuff all the time and wonder how robust it is.
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Old 09-26-2019, 06:58 PM
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I always wonder about blueprint engines when I see their product at summit. Seems pretty economical for what it is. Does anybody have any knowledge about these? It says a new Blueprint block, do they outsource it from a known company or are they "overseas" castings ?
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Old 09-27-2019, 05:18 AM
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Originally Posted by smashm View Post
I always wonder about blueprint engines when I see their product at summit. Seems pretty economical for what it is. Does anybody have any knowledge about these? It says a new Blueprint block, do they outsource it from a known company or are they "overseas" castings ?
I have no personal experience but read a HotRod magazine article that they were super impressed with the product and quality control. At least worth a look into it.
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Old 09-27-2019, 10:07 AM
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The block is from overseas. Have no experience or reports from it. Maybe a Google search ?
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