| Part# 1990P1: Specifications: - Use a 4.500 rod.
- Piston measures 2.568.5 Finish bore is 2.572.
- 565 compression
- Weighs 89 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 Lock
- Complete Ring Kit. 2.572XM
- 2 Ring Piston.
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