From what I hear they are made by SH engines in Taiwan here is a link to a comparable engine:
http://www.shengines.com/TECHDATA_PT2004-XB.htm
The 350 is a great little engine for running at your local club races, on any given day you could see some pros running it. Want to make this engine even a little better, slap the turbo button conversion on it and watch it sing.
http://losi.com/Products/Features.aspx?ProdId=LOSR2345