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Cylinder block 4JB1/4JB1T has the same appearance with 4JG1/4JG2. The only difference is the bore diameter. We use the same raw castings as SANY for these two cylinder blocks. Precision casting processes minimise porosity and shrinkage, ensuring that non-machined surfaces are free from defects and guaranteeing consistent machining reference surfaces for subsequent machining. This effectively prevents defects that may occur in aftermarket castings, such as sand holes, slag inclusions and excessive porosity etc. Part numbers: 8-94437397-6, 8-97352744-2