Which size to bore

[400-416EX]

I am looking at boring my 400 to a 416 with a hot cam stage 2. Is this a reliable bore? I will be running an edelbrock carb bored for a 416, White Brothers W2 exhaust, rev limiter, and K&n Filter. I don't want to be wrenching all the time. Is this a good setup to get back into riding with. I will be riding trails and want to get back into racing MX.

[TC426EX]

That is a super reliable bore you should have no problems if you do it correctly. For extended reliability you may want to Heli-coil your head studs or get a heavy duty stud kit from Eastcoast ATV. Im not sure if you would have a problem with head gaskets with a 416, but I blew 2 of them on my 426 before I got the stud kit. If youre going high compression I would at leats heli coil them to give you some peace of mind, but other than that, you should have a super reliable and FAST bike from the mods you listed above. Good luck with it, and youll want to get it ported down the line too to increase your performance.

[400-416EX]

They are going to port and polish it when I drop off the motor, Will it need to be resleeved? I don't think it will but not sure. They will have it for the month of July I will be working. Cant wait till I get home and drop the motor back in and ride the heck out of it.
Thanks for the reply

[cals400ex]

a new sleeve isn't a must until larger than a 426