Baggage Allowance

I am flying Virgin next Summer from MAN to MCO and have just bought some new luggage.
I notice from the Virgin site that no piece of luggage must exceed 158cm when all 3 dimensions are added together.
I have just measured my new luggage which I though was within, and the largest case measures about 170cm.
How stringent are they with case sizes? Are they really going to m easure each case to check or will I get away with a few cm over?
Thanks
I notice from the Virgin site that no piece of luggage must exceed 158cm when all 3 dimensions are added together.
I have just measured my new luggage which I though was within, and the largest case measures about 170cm.
How stringent are they with case sizes? Are they really going to m easure each case to check or will I get away with a few cm over?
Thanks