How much does it cost to swap an engine for a 20p4 honda accord 4cyl?

Is your current vehicle a manual transmission driven 2004 Accord with a 4 cylinder engine? This forum can't really get you that information. You'll need to "find a shop" - use the link at the top of the page and enter your vehicle information and zip code to find some shops near you that can help you. Get some competitive estimates and make a good decision from there.