Chevrolet LS Flat Top fits LS1/LS7/L92 headsCylinder Bore: 4.125"Compression Distance: 1.045"Stroke/Rod: 4.125" w/ 6.125" RodDome Shape: -8ccComp. Ratio: 4.125" Stroke w/ 64cc Heads: 11.5Piston Rings Included: Yes, Low Drag File-Fit Rings