would anyone know if an ls6 would fit in an thirdgen car, or an lt4 would fit

 

Sure why not? The LS6 will require a bunch of fab work though, and IMO theres no point in getting the LS6 instead of a LS1 unless you find one cheap. Good luck on that.

The LT4 will fit same as the LT1. Again, IMO theres no reason to go with an LT4 over an LT1 due to the added cost just because of the designation, unless you find one cheap. Good luck on that too.

 

ok, I got two points for this one. The coolness factor for having an LS6 would be through the roof. The expense of having an LS6 would also be through the roof. I would get an Lt1 and for the price of an LS6 you could have so much more power out of it