thats good. you can do it only if your 5 sites from different IP's ...... And must br related content... do with b to b and a to a ... dont with a to j
According to Google, it is good to interlink sites only if they are: a. Relevant to each other. b. Has exactly unique service or content between those domains. c. Provide a useful and good user experience. d. iIn complete conformance to Google quality guidelines. If your interlinking strategy contradicts the above principles, I highly recommend to put rel="nofollow" tags to those links or 301 redirect all the pages of weaker domains to your most strongest domain. THis concentrates traffic and links, making the strongest domain even stronger.