I dont know the flat 12 use chain or belt or gear driven sprockets. I found the 2006 emission book, states the H12 engines were imported to US on the years of 1987 to 1994. The size of H12 is 4.9L or 301CID.
I smogged some exotic cars at the station abt 4 yrs ago.
Feb.2005 1997 Ferrari F344 GTS, 3.5L V8, M/T, AIR, mileage:27,429
Dec.2004 1997 Ferrari F355 Spider, 3.5L V8, M/T, mileage: 9,030
Apr. 2004 2003 Lamborghini L-147 Murcielago, 6.2L V12,M/T,mileage:2,240
Jan.2004 1997 Ferrari 550 Maranello,5.5L V12,M/T, AIR, mileage:13,333
Failed for MIL
May 2003 1997 Ferrari 456 GTA,5.5L V12, M/T,AIR mileage:10,020
Aborted due to no RPM signal
Some of them were from the nearby exotic dealership.
