I found this site to have some good info, on what year Harley did changes to the twin cam motors. http://www.motorcyclemachine.com/twi...ts%20sheet.htm

 

Hi! I think it was 1999 when Harley went to the twin cam engines. That was when they started with the 1450 cc engines also.

 

Charlie missed one recent change. The 2006 and later heads went to a 1.800 intake valve.

 

Thanks for the information. You have just confirmed what I was told about the Timken crank bearings ending with the 2002 models.