Re: 1957 Johnson 35hp 2-line Conversion Home › Forum › Ask A Member › 1957 Johnson 35hp 2-line Conversion › Re: 1957 Johnson 35hp 2-line Conversion chinewalkerUS Member - 1 Year (includes $3 online payment fee)Replies: 459Topics: 15 June 5, 2018 at 6:57 pm #77477 I think you’ll find the 35 intake port already has the boss there – just need to drill the center one through and tap the other two holes.