Diamond Pistons BBC Big Chief Big Duke 18°- Dome Top

Designed for large nitrous kits. 2618 alloy.
• Top gas ports for maximum ring seal.
• Ratios figured for .010” to .020” deck@9.800” and 10.200”.
• Back-cut .043” (.175”) x 1/16” x 3/16” ring package.
• Premium H-13 wrist pins included.
• Gasket Volume - 11.3cc.
• Top ring down = .340”@1.240”cd to 1.270”, .290”@1.120”cd.
• Designed for 2.400” diameter intake an 1.950” exhaust valves.
• Valve relief depth = .315” and .068” exhaust.
Includes Oil ring support rails.
We will special order any Diamond piston not in stock reguardless of the OEM manufacture.