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- Black 4.250" big bore cylinder set with machined edge fins increase the bore size from 124" to 128"
- Features a slightly larger fin area for better heat dissipation and increased cooling
- For use with stock 4.375" flywheels but requires case boring
- Spigot O.D.: 4-3/8"
- Must order piston set separately
- Fits 2017 and later M8 engines