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$3500 just for the motor alone. I got the 2 frames for $200, it was too hard to pass up. I've already began ordering parts for my first build. I was only making the post to see what engine build I need to look into for flat track racing. The only thing I don't want to do from the ground up is building a motor. I would rather let the professionals deal with that end while I'm getting the frame part ready. Competitive flat track for sure. $3500 is the budget just for the motor build alone. I'm glad I posted this question before buying! I was looking into a 472 or 421 build, I have it written down in front of me. I think I'm leaning toward a 421 build for sure. I haven't looked in the 392 build yet, I'll replace it with the 472 on the list. I got a pair of shearer pipes on the $200 deal for the frames. I thought the CPI and shearer pipes are for drag? Thanks for the information. I really appreciate it this helps a ton.

I've got a -2 swing arm on the way already. Also have +3+1 a-arm set too

Just for the engine, sorry for not making that clear. I'll edit the OP again.

Recently bought two banshee frames only, so I've got a clean slate on what to build. I am planning to only build one right now, the other will be built end of the year/first of next year as a trail bike. The one frame I am focusing on is going to be a flat track racing build. I figured if I'm going down this road I might as well buy the right stuff the first go around. The main question I have is what motor/build should I look into for flat track racing only? I do not own any banshee motors yet just want to buy the right one best suited for my needs. I have started a list of the build, motor is going to be the first thing I buy. Currently getting ready to powder coat the frame. Any questions, I'll try to answer as quickly as possible. Thank you! EDIT: I forgot to add my budget, I would like to keep it around $3500. It can be more if it's worth it.