KB PERFORMANCE Piston Kit - Twin Cam KB409C.STD

If you're building or rebuilding a Twin Cam engine, piston quality directly impacts reliability, power delivery, and ring seal—and that's where KB Performance separates itself from the field. The KB409C.STD uses precision diamond-machining and T-5 heat-treated 390 hypereutectic aluminum to achieve tolerances other manufacturers simply don't hold, resulting in tighter fitment, less piston rock, and longer service life. When you're investing in engine work, these pistons eliminate the guesswork and deliver the consistency that separates a well-built motor from a mediocre one.

• T-5 heat-treated 390 hypereutectic aluminum
• Diamond-machined to ±1 gram tolerance
• Piston-to-piston runout: <0.0005"
• Tighter fit, reduced rock
• Superior ring seal performance
• Hastings moly rings included
• Two pistons per kit
• Includes pins and spiral-lock clips
• Fits Twin Cam engines
• Bolt-on installation
• Professional ring gap setup recommended
• Replacement rings sold separately