is their any engin that will fit in a blaster frame without a lot of modification or is their a top end off sothing else that will fit on a blaster to give me more power

 

The DT200 engine is the same engine as the Blaster but has a power valve. Check out the link to "I've got RZ 350 jugs how do I make 'em work". There's a guy named kiwicraig that has done it and there's links to a site that shows one {I think}.