Constant sc_basic_authorship::DEFAULT_BLOCK_SIZE_LIMIT

pub const DEFAULT_BLOCK_SIZE_LIMIT: usize = 4 * 1024 * 1024 + 512; // 0x0000_0000_0040_0200usize

Default block size limit in bytes used by Proposer.

Can be overwritten by ProposerFactory::set_default_block_size_limit.

Be aware that there is also an upper packet size on what the networking code will accept. If the block doesn’t fit in such a package, it can not be transferred to other nodes.