setting up some m3 prochargers on 540's. looking for advice . dart heads 9.5 comp low boost 5lb. plugs heat range gap,timing ect.
what is your setup?taking suggestions

just finished a m3 on a 555ci , are you goint to is a carb or efi ? throttleman

carb blow thru csu with a hat

There is a ton of info in the search feature...MOst has to do with efi but you should find what you need...I know a dyno is almost a must to get an efi right....

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Orig 540 procharger set up used a gravity feed oil feed and drain boost referenced fuel feed Mr43t or 1 step colder plugs ..I have the orig install manual and some extra brackets

Run a M3 on a 509, when running a carb had prosystems do a 950 for me was spot on out of the box, ran the procharger box, Patrick did not like the idea of me running a hat, and they are NOT legal on a boat, now running our own port EFI and that is the way to go hands down..as far as tuning, if you do not have a carb done for the app, jet pretty rich to start, have to boost reference the power valve in primary, don't run one in the secondary, make sure you have solid floats(not brass) as they will crush, I run a aeromotive A1000 pump large line and a boost referenced regulator with a RETURN(very important) locked dist at about 28 timing..good luck Rob

rob thanks for the info how much boost are you running?I had kevin at csu build my carbs for hats ,.

I'd run a plug at least a couple steps colder than a delco 43. Thats a stock mercury naturally aspirated plug. I'd run a NGK -9, or even a 10. And NON projected tip. Boost referenced regulator with a return to the tank.

Return to tank or through a cooler back to front of pump this works better in a single with twin tanks ......good luck