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I thought I would find this in the FAQ but wasn't able to. I also tried using the find your prop on this website, but it lists like 25 or so props for my motor. So hoping the wisdom of the group can help 
The 1978 Johnson 70HP 3 Cyl I just bought came with no prop. I have a 1974 Starcraft 16' Holiday runabout which weighs in around 600 pounds. I mainly use it for fishing, not waterskiing or towing tubes. I need good fuel economy and am not all that concerned about speed, it is plenty fast with the old 40HP that I used to have on it. So I would like a prop that gives me good performance at 3/4 throttle to save gas. There are usually a max of three people in it, so about 500 pounds plus fuel and battery. It is a 13 spline shaft. I used the boatnet chat gizmo and the guy told me the standard prop for the motor was supposed to be 13x19. A buddy of mine said it should be more like 14 x 17 but he has a pontoon boat so I am thinking his pitch is smaller to keep the revs up on a slower kind of boat... Any help?
The 1978 Johnson 70HP 3 Cyl I just bought came with no prop. I have a 1974 Starcraft 16' Holiday runabout which weighs in around 600 pounds. I mainly use it for fishing, not waterskiing or towing tubes. I need good fuel economy and am not all that concerned about speed, it is plenty fast with the old 40HP that I used to have on it. So I would like a prop that gives me good performance at 3/4 throttle to save gas. There are usually a max of three people in it, so about 500 pounds plus fuel and battery. It is a 13 spline shaft. I used the boatnet chat gizmo and the guy told me the standard prop for the motor was supposed to be 13x19. A buddy of mine said it should be more like 14 x 17 but he has a pontoon boat so I am thinking his pitch is smaller to keep the revs up on a slower kind of boat... Any help?
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