What's the biggest I can bore my cylinder out before I have to replace the crankshaft. I also want to rebuild the head and people talk about 380 lift cams, can the lift be adjusted manually or do you have to buy a new cam. I can't find any for the mojave. I found a 380 cam but it doesn't specify what quad. So can I use any cam? Also the same with the valve rockers will any fit it there or do they have to be model specific.