If you're keen.
You can by LQ9 Gen3 Iron blocks which have 4" bores. So with an LS1 crank it will make 6ltrs. It will accept 241 LS1 heads and everything associated with them. It will bolt right in and wire straight up in place of an LS1 but you have 6ltrs as a minimum.
Going to a gen4 will need a bit more work and wont wire right up.