Re: 1956 Johnson 30 HP casual q’s Home › Forum › Ask A Member › 1956 Johnson 30 HP casual q’s › Re: 1956 Johnson 30 HP casual q’s olcahUS Member - 1 Year (includes $3 online payment fee)Replies: 566Topics: 94 June 7, 2018 at 12:53 am #77568 Frank, I see the plate is thick although I am running in fresh (not brackish) water here. Sounds like I still need to check. Thank you.