How to determine engine displacement???

Please excuse the ignorant question, but I have a Vintage 550 and do not know the engine size. Is there a simple way to determine which engine I have? It has dual Weber carbs.
Thanks!

The simplest thing would be to contact Vintage with the chasis serial number..... If it was built in house, they may have that data..... Dual Webers means nothing.... They can run on a 1200 cc engine as well as a 2332..... Otherwise you pull a head, measure bore and stroke...

Or you could fill one cylinder with a measured amount of oil and get a close SWAG....

I know this sounds trite, but its the only way I know of.... Sorry.

Thanks for the tips, Leon. I have called Vintage and evidently they can't tell anything from the chassis number. But I have sent Greg pictures and am waiting to hear back from him. Hope that works.
Thanks again for the input,
Craig