please help me! 95 civic ex

I just bought a 95 civic ex..i was told it had 133,000 miles and vtec...the valve cover says vtec, but i dont feel or hear a difference in shifting when i hit 4500 to 5500 rpm like i was told..And the title says 205,000 miles but odometer reads 133,000...I thought they swapped motors but am now thinkin maybe they jus changed the v/c and headers and changed the odometer..is this possible? was wondering if the D16z6 all come with vtec? I dont know how to tell if i was ripped off or not...Also there is a small highpitch humming noise when i hit 3500 rpm, would this be the vtec? and there is oil comeing from the left side of the engine? any ideas...please help.

Check the block it will be labeled Z6. Also yes u dont really notice a change u should just notice that you dont lose power sometimes in the lower gear you can feel the pick up but usually i dont feel it till about 5 or higher

Check the block it will be labeled Z6. Also yes u dont really notice a change u should just notice that you dont lose power sometimes in the lower gear you can feel the pick up but usually i dont feel it till about 5 or higher

All the 95's "EX" are V Tec.