Conversion from 305 270Hp to 350 330Hp.this is EFI and Multi-port and Running rough. I just bought a 05 Monterey 270hp GXI/SX from a guy who let the block freeze. I bought the boat 21', with the idea of dropping in a 350 adding a few pony's. I bought the block from an outfit in Kent, WA. They said there is no way the FI, multi port will know it's now sitting on a 350 and that they have performed this same conversion many many times.
I just received a call from the mechanic informing me the motor sounds like it has a hot cam in. It's not running right, and hard starting.. It surges a bit then settles down but still rough running. This guy is meticulous and would have performed the work better than I. I'm not sure what to do at this point. I live in Boise Idaho, and I'm willing to drive it over to Kent but that seems ridiculous. In the off chance they have the wrong cam profile, should I even mess with flashing the Meffi/sp or I have heard pulse width issues, both over my head.. I have shelled out a few bucks for this thing and just needing advice on my next best move. Any and all help would be appreciated.. thanks...John