What does an 88 cubic inch Harley motor convert to in cc's?

A few tricks, first and foremost to get the specific answer with the specific given information of 88 Cubic Inches

-A cubic inch is 16.387064 cubic centimeters, (CC)-

you multiply 16.387064 x 88(your Cubic Inches of motor)= 1442.061632 (CCs)

Or if you know that you have a 1.4 Liter Motor, as according to your factory build OEM Manual, you can take the decimal point to the right three times to equal 1400 (CCs) .... so 1.4(L)=1400(CC)s -This is of course not the engineering spec but rather A close estimate usually given to the consumer.