Hi names Alex I got hands on a b18b2 for my 1997 civic this would be my first build and I'd like to do it right and get all the goodies I want to do all motor and try to reach 300-400 hp not exactly sure where to start. I'm not all that knowledgeable about bore sizing or what size pistons I'd need or what boring out does or if I should run a different cam idk just looking to get informed thank all for helping

 

Your goals aren't possible.

 

I love the range in HP desired by the OP... like the difference in making 300 or 400 HP is inconsequential. Getting a non-VTEC "B" series to 200 wheel HP is a feat.