V8 swap
 

Will a 6.2L fit in a 98 blazer I know the 6.0 will not to sure about the 6.2 has anyone ever successfully achieved this?

6.2 is still a LS small block motor. will be the same size as a LS1 or LS2. (quick google search turned this up).

Many LS engines have been installed into s-series engine bays by this point. And the basic dimensions of the LS family are not all that different. The differences come from intake manifolds, oil pans, and exhaust manifolds. All of which can be swapped out to something more accommodating the space the engine is going into. So a 5.3L, 6.0L, and 6.2L can all 'fit'. Like any V8 swap into an s-series, there are challenges when adding those extra two cylinders.