Precision Casting to meet or exceed OEM Specifications with high-quality materials, wear-resistant and durable, and the foundation bolt type is 3 3/4 x 2 inches. Perfect Works on V8 5.0L 305, and 5.7L 350 Mercruiser engine with 2 barrel mercarb.Replacement Part Number: 3310-804622R1, 3310-86448A1. Calibrated and Engineered to Maximize fuel Efficiency and Performance and Tested throughout the Entire Throttle Range. According to the requirements of different working conditions of the engine, the carburetor automatically proportions the corresponding concentration and outputs the corresponding amount of mixture, so that the mixture is evenly mixed, which provides power for the start and operation of your Boats. Fuel Mixture and Idle Settings Pre-Set to ensure that only Minor Idle and Choke Adjustments are necessary during Installation Package Include: 1 x carburetor, 3 x gaskets, 6x Metering Jets,1 x fuel filter, 1 x fuel line, 1 Carburetor cleaner kit and other accessory. Replacement Part Number: 3310-804622R1 3310-86448A1 Compatible Engine: V8 5.0L 305 Mercruiser engine V8 5.7L 350 Mercruiser engine Package Include: 1 x Carburetor 3 x Gaskets 1 x Fuel filter 1 x Fuel line Other parts