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ACL Update Process

Can someone please describe what components get updated when you update an ACL. Supposed you have a 4900m and 4 interfaces have the same ACL applied and you add two additional lines like the ones below. Can this cause traffic being sent to those interface to stop for a brief microsecond? I guess what I am looking for is what happens in the background during an ACL update. Does the TCAM get updated? I appreciate any input and feel free to Bash away :-) The reason I ask is because I made an update simlar to the one below it seems to have caused some multicast gaps.

         1040 permit udp any host eq 36987

        1050 permit udp any host eq 36986

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