Constant MAX_BLOCK_REORG_HEIGHT 

pub const MAX_BLOCK_REORG_HEIGHT: u32 = zebra_chain::parameters::constants::MAX_BLOCK_REORG_HEIGHT; // 1_000u32

The maximum chain reorganisation height; it bounds the length of the best non-finalized chain. The value lives in zebra-chain so tooling (e.g. zebra-checkpoints) can use it without depending on zebra-state.