Yes 450r. This is a direct bolt up to your engine. sayy 450, I bought the 3rd RPM Ice cube engine on earth. It was a CRF 250X. Sent it to RPM in Califorina. came back a 302 long rod stroker engine. $ 2,995.00. A baby 450!! The first engine was a factory test bed. The second engine was tested in the Paris-Dakar rally. The 3rd build was for me! What a engine that was dude-- welded frozen crank- you name it, it was a gem.