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- ASC69885 F Piston
- Parallel Valve Lycoming O-290 & 435 Series Engines
- 8.5:1 Compression Ratio
- 4.875 Bore
- Approx Weight = 1140 grams
- This piston uses standard Lycoming Rings and Piston Pins
- Top 2 Ring Grooves are Full Keystone
- Oil Scraper Groove (below pin) Omitted
- This Piston is not FAA-PMA Approved and is for experimental or ground use only
- Forged and Machined in the USA