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0505em Cadillac 12 Z

Manufacturers love hypereutectic pistons because they don't expand. That means tighter bore clearances, better cold ring seal, and a quieter engine. However, brittle hypereutectic pistons end up in the pan when subject to heavy pressure. So after cams and headers, Johnson advises a set of forged aluminum pistons. Arias worked with Johnson specifically for these. They feature tool-steel pins with stock diameters for most applications and larger diameters for heavy boost settings.
Hot Rod Guide To The Stars

Manufacturers love hypereutectic pistons because they don't expand. That means tighter bore clearances, better cold ring seal, and a quieter engine. However, brittle hypereutectic pistons end up in the pan when subject to heavy pressure. So after cams and headers, Johnson advises a set of forged aluminum pistons. Arias worked with Johnson specifically for these. They feature tool-steel pins with stock diameters for most applications and larger diameters for heavy boost settings.  View Related Article

 

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