Diamond has announced new premium forged pistons with tool steel piston pins for turbocharged small-block Chevrolet engines.

Especially suitable for drag racing applications, this new piston is produced in 2618 aluminum and is designed to fit most 23-degree cylinder heads. Accepting up to 25lb of boost the piston features a robust .260in thick crown and Herculean pin bosses that accommodate tough H13 tool steel piston pins.

The piston pins are provided either uncoated or with a DLC coating. DLC coated pins are a sensible choice for engines equipped with a dry sump or with vacuum scavenging, where pin lubrication can be compromised. To lubricate the pin, these pistons feature double oiling ports in each wrist pin bore, which are fed from the oil control ring groove.

Lower skirt rigidity is maintained by a full circumference design that boasts the strongest known stiffening ribs, located just below the piston pin bores. The objective of these shelf-style ribs is to provide the necessary strength to combat high heat and pressure.

The top ring is placed .240-.300in down from the crown. Between the first and second ring lands a V-shaped pressure balance groove is formed to relieve any unwanted pressure between the rings. A Total Seal ring pack is provided comprising a coated stainless steel (AP) 1/16in top; a Napier-style 1/16in second; and a conventional 3/16in oil control ring.
Though anodizing is available only on custom designs, the extra protection provided by ceramic crowns and moly skirt coatings is offered as viable options on the shelf-stock items. Prices for these shelf-stock items begin at $815. Custom turbo designs are mostly completed in 7-10 days.

For printable catalog fact sheet or more information, visit www.DiamondRacing.net

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