In the backs Rhys Griffiths gets his first start at scrum half and Joe Sullivan joins in-form Joe Xiberras in the centre.
Up front Carl Kimber returns at No 8 after recovering from injury and John George, who made an impact from the bench last week, starts in the second row instead of Alex Luff. Mike Stephens replaces Sean Cochlin on the subs bench.
"This year we have locked horns with Ebbw on a regular basis. Saturday will be a good marker of our progress in recent weeks," commented head coach Chris Ower.
"Our sides know each other very well, there will be few surprises but their league position does not lie. They are in top form," added forwards coach Matthew Bolton.
Glamorgan Wanderers 15. Owen Marshall 14. Dan Lovell 13. Joe Xiberras 12. Joe Sullivan
11. Ian Newbury 10. Gareth Cull 9. Rhys Griffiths; 1. Joe Russell 2. Mike Catris 3. Mel Lewis (capt) 4. John George 5. Ed Morris 6 Dan Richards 7 Andrew Bradbury 8. Carl Kimber
Replacements: 16. Ross Grimstone 17. Ryan Beddows 18. Garth Knight 19. Mike Stephens 20. Tim Cronin