HEY THIS IS A POWER HEAD THAT CAME OF A 2000 MERCURY OPTIMAX. I BOUGHT THIS MOTOR OVER 10 YEARS AGO. IM 63 KNOW I COULDNT GET THE FUEL INJECTION TO WORK I CHANGED THE ECU. IM A OLD SCHOOL MOTORCYCLE MECHANIC . WELL IMÂ GOING TO PART IT OUT IDONT NEED. THIS MIGHT BE A GOOD POWER HEAD IF U CAN GET THE FOEL INJECTION TO FIRE. IT WOULF RIGHT UP IF PUT GAS IN THROTTLE IN THROTTLE BODY.