Product Description

Diamond Pistons - 4.065" Bore / 9.5:1 CR - LSA / LS9

Bore: 4.065"

Compression Ratio: 9.5:1

Stroke: 3.622"

Dish: -11cc

Rod: 6.125"

LS9/LSA Competition Series

Piston Features:

• 3D milling on piston crowns for ready to install finish
• Valve pockets designed to work with most aftermarket cylinder heads
• Offset pins for quiet operation
• Moly skirt coating for friction loss and skirt wear protection
• Top ring down dimension: .250"
• Ratios figured for .040 head gasket
• Premium 1.2mm x 1.2mm x 3.0mm ring package included
• Premium 8620 .185W wrist pins included
• Valve pocket depth: 0.178" intake and .108" exhaust
• 2618 material for High HP-NOS-Boost applications