or the RX21P5 with a displacement of 3.49cc .21 which is .03 cc different from what you posted...
http://www.teamtrinity.com/nitro/eng.../novarossi.asp

Then there is the Sirio .27 Race/Pro with a displacement of 4.42 cc's
http://www.teamtrinity.com/nitro/eng.../novarossi.asp

And here is a link to an engine displacement calculator based on bore, stoke and number of cylinders
http://www.europartsinc.com/zonker/eng_disp.htm

The ROAR rules at page 31, section 6-12, also provide the formula to determine engine displacement.
http://www.roarracing.com/rules/pdfs/2003rules.pdf