I am looking for some help with a 502 magnum. It was transplanted into a 98 Baja 232, the motor according to the owner has been bored to 60 over. I got it in trade, hasn't ran since 08. The injectors were dirty, the cool fuel pump was bad, leaking orings, striped screws in the fuel line, cut wires. the list goes on and on, but the trade was worth it as i got rid of a new boat, so i'm not in this to deep, well not yet.
The engine builder is very reputable, and he remembers working on it, but no clue what he did other than a rebuild. and didn't seem to interested in helping. So i'm flying blind.
All the above has been fixed, the timeing was way off, i reset it to TDC set the distributor and it fired. Now the help i need is,
A: What should i set the timing to on a bored 502 MPI magnum?
B: Does a motor like this run on 87oct? or does it need 91 all the time?
C: Should it have a tune in it?
Any help would be greatly appreciated. First high performance boat, used to working on cuddy cabins, and i'm an outboard mechanic by trade.
The timing has to be set with a scan tool so you can put it in service mode to lock the timing. After that it is 8 deg. btdc. The ECU adjusts the advance. In stock condition they like 87 to 89, but who knows what the rebuilder did as far as compression etc. If it has the stock camshaft and compression, no need for any special tuning.