Help Dumping a Block

Does anyone know how to dump an Oracle block as just the binary data without formatting or commenting as part of the process?

ALTER SYSTEM DUMP DATAFILE 6 BLOCK 21229; Is not what I need.

Thanks.

-- 
Daniel A. Morgan
University of Washington
damorgan_at_x.washington.edu
(replace x with u to respond)
Puget Sound Oracle Users Group
www.psoug.org