I am looking for someone that is reputable in tuning a ecm for a 502mpi that has been built to a 509. I am located in illinois I would prefer local but anywhere is fine. I was thinking about removing it and going carb I have had just to many issues with the way the boat is responding now. seeing that the engine has 65hrs on it and need another valve job. I am going to have the heads done but need the ecm retuned .

thanks in advance

TYLER CROCKETT Ruby Michigan.
http://www.crockettmarineengines.com/

Talk to Mark at Precision.

Hands down he is the best.

www.pmefi.com

Whipple industries

I agree with Smitty, Mark is great! Will you have dyno numbers?

Mark at Precision did my 575's vary happy. Also why would you take fuel injecion off and put a carb back on. Thats why new cars have fuel injection, if a carb was better they would still use them. Also yur valve job issue sounds alittle weird. R u running good stainless valves with harden seats?

Another vote for Mark at Precision.

Thanks for everyones help. I spoke with smitty. I got all info my ecm is on its way to percision. I was going to take the efi off cause I was getting sick of the bs from builder I was dealing with. One the head issue the shop that built it first time never changed the valves all they did was look at them. those were stock with 300hrs on them he just put a could used ones in it he said. I will never go back to the original builder