| Part# 1990P2: Specifications: - Use a 4.500 rod.
- Piston measures 2.578.5 Finish bore size is 2.582.
- 565 Compression
- Weighs 93 grams.
- 3.5 to 4 Thou piston to wall clearance.
**Measurements are done with our Micrometers** Parts: - Piston
- 1.880 long wrist pin
- 2 Spiral locks
- Complete Ring Kit. 2.582XM
- 2 Ring Piston.
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