HELOC how much will a mortgage lender offer

If I own a home clear and free/paid off, and it’s appraised lender value is $400,000, how much home equity or HELOC will I get based on this amount? Are lenders lenient with a high percentage of 85% of my $400,000 or will they give me much less? How about a hybrid HELOC with a secured mortgage promissory note? Thank you, Arthur Voskanyan