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RaceTec AutoTec Flat Top Forged Piston - 4.125 in Bore - GM LS-Series (Set of 8) Design Engineering While STEF'S Fabrication Specialties offersProduct Description: Piston AutoTec Flat Top Forged 4. 125 in Bore 1. 5 x 1. 5 x 3. 0 mm Ring Grooves Minus 4. 10 cc GM LS Series Set of 8 RaceTec Pistons was founded by Wayne Brooks, and is his second venture into the piston manufacturing industry. In addition to owning a successful aerospace manufacturing company for years, Wayne was an avid racer. He has always modified engines, and has raced everythingboats, motorcycles, even airplanes. Wayne was