I call the set back that the engine mounts onto the bubble. Don't know what else to call it so I coined the phrase. Since a V20 has an almost flat transom, the setback on the V21 from the outside looked like a bubble to me.
Anyways, if you look at the inside of the transom where the bubble is attached you'll see that the two pieces (transom and bubble) are not connected very well. There's a gap on the sides. it's that gap that I'm talking about. fill it with filler and then class it all together and that should add some additional strength to the whole transom. It's not necessary, but when I had my deck off and looked it just seemed prudent to do so.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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