engine builder wanted..help!

[EXDUNER127]

I need to know of any engine builder that sells a kit for a 300ex bigger than a 352cc stroker, by brother in law has everything else done to this thing, if anyone has any answers please help we have been looking all over...

[OutlawEX]

cehck out powroll.com they got some pretty sick set ups,,Top pro rider Travis Spader used them