we ran these motors on 10ftx36wide aluminum alweld boats made in the early 80s they were light. im going to try to get some pictures of them so ya'll can see them, ive got some of mind just have to find them.
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That's crazy fast for a 20, did u run low water pickups or just stock lower units? Where did you guys get ur stacks?
yes them 20mercs would run on the 10ft boats,, my motor has the ole bayer stacks, they still on it. the 25 johnson like u have has the hustler stacks made by bob snider, he built 2 sets for 2 guys down here and they make a big differents, i think bob still buids them, just have to find him and talk to him. the lower unit was a stock unit, i cut some channels in it and made the bottom hole bigger and block off 3or4 at the top.
I would definitely like to get a set of stack , just to have LOL. Just out of curiosity what props and rpms were you guys running.
7300 rpms on the 20merc, the motor was all balanced, the props i used was the 3 blade cleaver that mercury made for that motor, they come 10X14 pitch i would have to cut it to 93/4 and pitch it to 13 to 131/2 so i could turn it. the motor i still have will still get it. the 25s they could turn alil bigger wheel than the 20, they had threw the hub cleavers, and there pitch was like 18 to 20 i think theres was around 6500. ill have to ask the guy who run it to see.
Stacks will make a difference. MW, would those be with a filler block off the xhaust ports or out of the mid? Best I saw w/a stock [no stack] 31.8 on a non thru hub was 52 gps on a pals wetback hydro. Beyond that I use Yamato gear cases to exceed 60. For the moment my 'practice' hydro/31.8 will outrun my C stock but not for long I hope! LoLs
My motor is a 1990 evinrude 20hp model# e20cresb