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Owned by Melling. QualCast a quality valve seat Manufacturer. These Exhaust valve inserts suit 6.0L Rectangular Port Heads as found in LS3 L98 L77 L76 Commodore engines
| Outside Diameter | 1.634 |
| Inside Diameter | 1.360T |
| Top Taper ID | 1.466 |
| Exact OD | 1.6340 |
| Depth | 0.300 |
| Seat Angle | 45 |