This engines a stroker 2.1 i think, don't no the exact spec but its built by a bloke called sandy brown, hes built a number of championship winning pug engines at combe and is considered the pug engine guru, think hes broke the 300bhp barrier with a n/a vauxhal xe engine aswel.
Have a look on the 205gti drivers forum for more info as he has built a few engine for people on there.