502 upgrade
09-25-2019, 12:28 PM
#1
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.
09-25-2019, 02:21 PM
#2
Registered
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
09-25-2019, 02:27 PM
#3
Platinum Member
Platinum Member
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.
09-26-2019, 10:07 AM
#5
Registered
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/
https://atecoengines.com/
09-26-2019, 12:11 PM
#6
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/
https://www.summitracing.com/parts/mll-psm5400ctc1/
Gold Member
09-26-2019, 06:58 PM
#8
Registered
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 ?
09-27-2019, 05:18 AM
#9
Registered
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.
09-27-2019, 10:07 AM
#10
Registered
The block is from overseas. Have no experience or reports from it. Maybe a Google search ?
