1450cc is an 88 inch Harley
Since each cubic inch is 16.387064 cubic centimeters, you can just multiply 16.387064 x 80 = 1310.96512 (CCs) So Eighty Cubic inches is about 1311 CCs, and yes that's a big motor, about 1.3 Liter. I think I once had a Ford Escort (car) that was powered by a 1.8 Liter motor, but that was a 4 cylinder.
It is 1 inch. F.Y.I. Just about every harley since 2000 is 1". Just about every harley before 2000 is 3/4.
The density of lead is 11.34g per cubic centimetre. As there are 16.387 cubic centimetres in one cubic inch, one cubic inch of lead weighs 11.34 X 16.387 or 185.83grams. In ounces this is 6.55 (or just over 6 and a half) ounces.
8.1 liters would be just over 494 cubic inches
If my math is correct , just over 311 cubic inches ( using a 3.875 inch bore and 3.250 inch stroke bored out 30 thousand )
Just multiply the three numbers. The result will be a volume, in cubic inches.
Steel is typically 490 lb/cubic foot. There are 1,728 square inches in a cubic foot which means that each cubic inch weighs about .284 pounds (just a bit over a quarter of a pound per square inch).
Of course, different brasses and forms can vary, but at a specific gravity of about 8.5, a cubic inch of brass would weigh about 5 ounces (or just under a third of a pound).
Since there are 61.02 cubic inches per liter you just divide cubic inches by 61.02: 327 / 61.02 = about 5.4 liters.
If my math is correct : using a 4 inch bore and a 3.48 inch stroke , with the cylinders bored .060 , just over ( 360 cubic inches )
either +8 or +10 just to be on the safe side.
Just search for the numerous questions about the volume of a cylinder. Note that a 2-in pipe has a radius of one inch.