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will it fit

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It should. I believe they are designed with the EZ-start in mind, but if you get a pull start version, it should bolt right in to anything that will accept a .12-.18 with a slide carb, pilot shaft and rear round port exhaust.
 
New Era makes a conversion for the Nitro rustler so it will accept the ofna mid .21. It has wider mounting holes on it, so it will need newer mounts, i dont think it will fit on a standard .15 engine mount.
 
I didn't realise that the mounting holes were different... Now that I think about it though, I think most of the mid-blocks come with a new engine mount.

Sorry about that.

I put an OS 18 in my nmt, but I haven't run it much since. Only about 10 tanks or so to start the break-in process.

I want to wait until I have the $ for a new header, pipe and slipper clutch before I really start to abuse it.

I think a 21 is overkill though. The diffs are only 2 spider diffs and the dog-bones are so small... I think you might just end up tearing up the driveline. But if you do, I want to see movies!
 
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