Although the S85 does not have thick walls in between cylinder bores, it does have one good quality – hard aluminum. If the sleeves are installed properly, the block loses no structural integrity. Meaning, the performance sleeves are quite thin, but radically stronger than the S85 aluminum. Therefore, by installing the thin wall sleeves properly, the great S85 block is now much more receptive to higher volumes of boost than the S85 alloy can handle. By simply lining the block with the thin wall, centrifugally spun-cast ductile iron sleeves, the cylinder bores can handle 50% to 70% more boost than that of the Alusil aluminum bore block.
The boost can care less what pistons it runs with in most cases. It’s the cylinder block walls that are compromised first, not pistons. If the S85 block aluminum is poor, it will fracture the block well before the pistons fail. That’s why we like to re-sleeve these alloy blocks ductile iron material. Not to save the pistons, but so the block can hold compression so the pistons do their job properly.
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