Centennial Viper Setup

Hello Randy.

My friend recently purchased a 76 Viper. The boat had hull damage which we repaired. I am in the process of rebuilding a 1977 Johnson 115 for the project. I would like to know what prop you would recommend, and what height relationship between the prop shaft and the pad. The motor has the old external style tilt and trim. I am putting in new pistons, because it has a bad one (needs to be bored). What RPM do you think would be safe for this motor? Do you think a 23 Merc lazer 2, would be a good choice? Any set up information would be greatly appreciated.


Green Lake , WI



Start with the motor one hole up and find a 22 Raker or 23 SST 2 prop. The 23 Laser is a large hub and won't fit. The 22 small tube laser will work if you change the hub. You'll turn most props right below the 6000 rpm mark. You should be in the 60mph mark in no time. 




Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Mark C.


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