big block square fin?

[plexiform]

i was searching around for parts for my 2002 scura and see some items being advertised as fitting any of the "big block square fins"  Can someone explain these terms for me and tell me if my scura is big block or square fin or both?  Much appreciated.

[fotoguzzi]

you have a square fin big block.. the round fin is from the past, it's about the shape of the cylinder barrels cooling fins.

 

 

the small block is the 750 in current bikes like the modern V7. there was a BB 750 in the 1970's like the V7 Sport.

 

[plexiform]

Thanks!