Try 
http://www.powerlinecomponents.com/
"jayhearts"  wrote in message 
...
 Greetings,
     We've moved up from a Tartan 30 with an Atomic Four to a Gulfstar
 41 CC Aux Ketch with long range cruising plans and a Perkins 4.108
 deisel engine.  In the Atomic Four world there is a vibrant
 aftermarket of parts and knowledge.  Does anyone know if there is a
 similar source of information, parts and advice for our new old
 engine?  We Homeport in the lower Hudson Valley, New York.  Thanks for
 any advice, also welcome connection to other Gulfstar and or Ketch
 owners.
 Thanks,
 J