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Dude get either of the os engines. These engines rip, i've just recieved my savage with one and all i can say it flies. Will easily beat my old s25. heaps of top end power and excellent punch off the line. You will not be dissapointed
 

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Visit traxxasrevo.com, i remember seeing some videos of one a while back. Sure look good. Also for 100us the OS.21RG looks like another good option
 

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30Us for the engine mount, allows all .21 engines, plus you can reuse the stock header. There's someone on the traxxas forum, with pics
 

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Obviously you have little or no experience with OS engines. They are by the easiest to tune, and are extremely reliable. Not everyone has 300US to burn on a sirio
 

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I've seen a wasp.26 and anOS.21RG but thats about it for bigblocks. Someone was thinking about a mach some time ago. All killer engines, don't know about the drivetrain issues
 
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