Going for better safe than sorry:<br /><br />I need a Main Jet size for a 30 hp OMC. <br />Using casting 432703 . The venturi size and flange dimensions are a match for a 30 replacement carb . <br />These carbs are of unknown heritage and I would like to verify what ball park size that I should be going for as a starting point. Either measurement or drill size will work.<br />I will track plugs for a proper reading while testing for final.<br /><br />Thank you in advance for any input.<br /><br />R Green
