Don't think it has bolt holes but not sure. I'm hoping to take the 3.3 out of my revo put it in my t maxx and the OS in the revo. I would like to use the traxxas manifold if possible. All I have found is that the OS manifold is universal so why wouldn't the traxxas header work? I realize the spring vs the bolts but couldn't I put the spring into the bolt holes? I'm sure ill figure it out just don't have the motor yet just trying to figure it out so I can stop thinking about it. Lol