Armstrong bracket repower- twins to single
 

I found a good deal on a 17 350 Verado and jumped right on it. Probably should have done a little more research but I didnt want to drag my feet and miss it.

I have an armstrong bracket on a 23 SF with twin 150 johnsons and im want to swap them out with the single Verado. The Verado is a 25in shaft so im thinking im probably going to have to do some tweeking or add a jackplate.

I was reading on another thread about someone trying to go from twins to single on a twin armstrong bracket and seemed like they ran into a couple problems and had to go back with twins.

I probably should have done more research instead of jumping the gun but id really like to make this repower happen if possible.

Any advice would be greatly appreciated

Bay Manufacturing may have a 5" extension for that engine. I ran that for years on a Yamaha with no issues.

You will have to weld up the lower holes in the bracket if they go into a flotation chamber but the if you have twin 25" outboards now a single 30" should work out with little change needed.

Yes my twins are 25" shafts now and they are on the third bolt hole from the bottom, so they are raised pretty high. The single i purchased is also a 25", it looks like it going to be very close to get it to fit without a jackplate or making changes to the bracket.

I spoke to armstrong today, they asked for me to send them pictures of the bracket, and turns out it isnt an armstrong. The previous owner must have just put a sticker on the side.

I wouldn't think you would have issues with a standard Armstrong. If you can post a pic of the bracket you have. Curious what it looks like if there are clearance issues.


Talking about the Armstrong stickers on an not Armstrong bracket, who ever had it before must of really wanted an Armstrong I guess. Kinda reminds me of kids back in school sowing patch labels on the back of cheap pants to make them look like "high dollar clothing".

bracket pics

bracket pic

Cant help but notice the first Pic shows the boats from Atlantic Beach, N.C. Is that where the previous owner lived or are you from down that way? Im about 45 mins away why I ask.


Any how that is defiantly not an Armstrong. Armstrong makes mainly if not only Aluminum brackets. They are mostly powder coated white but over aluminum. Yours looks to be a painted fiberglass bracket. Similar to an Hermco but not a Hermco but very similar construction to one. I would take a stright edge and see where the AV plate is going to fall in relation to the hull bottom on that bracket to figure if you need the 5" extension or not. You will want the AV plate at least 2"-3" above the hull bottom. Im guessing from the Pic you will probably be short with a 25" single but check it to see. If the AV plate falls over/higher than 3 1/2" - 4" above the stright edge you could get a lot of prop slip and have blow out in turns. If you cant get the 25" low enough in the water an extension or 30" outboard should work fine once you glass in at least the lower 4 mounting holes. I would go ahead and do all 8 if you don't plan on doing twins ever again so it seals it up.


One other thing I noticed on the first pic, the transom must have a slight crown in it outwards. I have had the same thing happen to me before in the past when redoing an transom. The weight bows it out slightly and makes you have to fill in the two outer edges of the swim platform with sealer. Not an issue or anything just an observation.

Since that is a FG bracket you might be able to notch it just a bit if you only need an inch or two. The single should weighing a bunch less should have it sitting higher in the water than the twins did. You would need to check and make sure the motor would still tilt all the way up without binding though.