502 MPI Mag/GIL Exhaust
#2
Charter Member # 55
Charter Member
I've got 502mpi's with CMI headers and as far as I know, the ecm's are stock. I bought the boat used and never asked. The engines were bought brand new in 2000 with factory warranty, so I doubt they changed anything. No issues with running lean and they have about 350hrs on them.
#7
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Join Date: Mar 2004
Location: Denver, NC
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I've got 502mpi's with CMI headers and as far as I know, the ecm's are stock. I bought the boat used and never asked. The engines were bought brand new in 2000 with factory warranty, so I doubt they changed anything. No issues with running lean and they have about 350hrs on them.
#8
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I do not have personal experience with this setup. But I know 502 mags run rich from the factory and leaning them out with better exhaust would probably be a good thing. If Griff say it works I would trust his judgement. He gives good advice. If in doubt install a wideband O2 gage. I have wideband O2 and it works perfect even a WOT.
#9
Charter Member # 55
Charter Member
My 2000 502mpi's have over 350hrs on them with this set up. I ran the MWBP ppoker run this weekend with the sticks on the dash for 90% of the time for the first 31 mile leg of the run. Mine are also dry to outside the transom.
#10
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We tried to mount some Gils on a pair of 502 MPI's for test runs and there were clearance issues between the port side and the oil filter mount ....The Manifolds were made for Gen IV blocks so I not sure if there is a difference. The Gils are an industry standard but tend to be old school now .... CMI would be nice but consideral more $$$$ .....m