What is the maximum gas limit in ETC network?

I tried storing around 18KB size content in ETC main net which is above 8M block gas limit so while transaction I specified a block limit above 8M in metamask and it failed. Can anyone help me how can I store that much size of the content in the blockchain? Please don’t suggest me to use Ipfs and store its hash rather than that large size of the content. I know that will work.