(1) ECHO Engine - Short Block Complete Short Block Engine Includes everything pictured in photo number 7. Cylinder Gasket #V100000290 and Crankcase Gasket #10024255930 Echo # SB1099 This is an original genuine Echo part, this is not an aftermarket part. This will work on the following Echo models: PB-770H & PB-770T FOR USE ON THE FOLLOWING MACHINES: · PB-770H S/N: P02912001001 - P02912999999-->Engine · PB-770H S/N: P05211001001 - P05211999999-->Engine · PB-770H S/N: P30613001001 - P30613999999-->Engine · PB-770T S/N: P03012001001 - P03012999999-->Engine · PB-770T S/N: P05311001001 - P05311999999-->Engine · PB-770T S/N: P30713001001 - P30713999999-->Engine