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1 Star starts with a remanufactured GM four-bolt main block punched out 0.040 over, making it a 357. It’s fitted with a cast crank and rods, hypereutectic pistons, and moly rings. This is step one in the cost savings, and one reason Star can offer these crates at such a low cost. There are upgrades available, like steel cranks and forged pistons, but those come with added cost.