1984 Cuddy, 2003 Johnson (Suzuki) 140 4-stroke. Runs 40 mph wot and sipps gas, I average 5 mpg.

What hp on your 20
 

74 Hull 82 Merc Black Max 150 40 MPH WOT

I have an 82 V20 cuddy, got it a few months ago with 73 Johnson 115, not sure on prop. Maiden fishing trip (after sea trials) with total 4 adults, 40 gal fuel, more fishing equipment than most charters own, 2 coolers full, and the usual safety gear. Went out of Ponce Inlet a few weekends ago, the Atlantic was like glass, top speed on GPS 26.3 mph. The next weekend sold the 115 and just purchased and mounted a 1998 Johnson 225 Oceanrunner. I can't wait to get this beast in the water now! I don't see myself going out with less than 3 people on the boat to fish, and since they help chip in for gas its worth it for the power. I didn't want a 2 hour trip to get to some blue water.... that's half a day round trip. MORE TIME TO FISH!!!:beer:

I'd love to have 225 too, but concerned about additional weight on stern...how does it sit in the water?...are the scuppers still above surface?

Welcome to the madness here...:party:

Everyone loads these boats so differently. My old 72' model seemed to perform well with a 135 Johnson.....but again it was a monster motor in 1973. Also, we didn't even have a bilge pump or radio, our motto was there's no more efficient bilge pump than a scared man with a 5 gallon bucket! A V20 performs well with a wide range of power, you decide how to load it down. I love the way the flare keeps the bow from stuffing into an oncoming wave at the last moment.

weight
 

Check out the PIC of my boat with the Yamaha 225. It does ride a lot lower in the stern, I have to shift weight up front to even it out, if everyone walks to the back the scuppers go under.....

Reworked 1983 20cc w/t-top 200Merc 2.4 liter carb on bracket 17p 47.9 on GPS. Not concerned about weight. Scuppers were done away with. No longer a self bailer. Just finished this 10-year project and hope to repower with a 250 3-liter in the fall. :sly:

The weight of the 225 certainly contributes to her sitting low in the stern, but it does seem to be a problem for a number of the V20's even with 150's on them...

A 150 two or even a four stroke should not be any trouble scupper wise, unless you have excessive weight in the back, or saturated wood or some other abnormality.
On the end of a bracket it would likely be a problem though.
All of them will bob and weave in a sea drifting with the scuppers being dunked, that is normal.
But making them non self bailing seems odd to me. Unless you have arranged some super double bildge pump arrangement to compensate for it.
The need for speed can be compelling I guess.

Speed wasn't the reason. The extensive redesign with the motor bracket gave me another 6 sq.ft of useable deck space. Because we were unsure of the at rest water level with a full transom and the bracket we omitted the scupper holes. I have the double automatic bilge pumps as you mentioned. Shifted a lot of weight forward in the boat to compensate for the bracket and the results were awesome. At rest we could put the scuppers back in but I hate having water on deck when heavily loaded.
That is what you risk when you modify the original.