You can't use a V6 alternator on a 4cyl. The alternator spin different ways.
I have been doing research on this subject since I have a 1997 Honda Accord with 4 CYL. F20B DOHC VTEC swap.
What I know so far is that the 4 CYL. versions of these cars
1990-1997 Accord
1998-2002 Accord
1997-1999 Acura CL
1992-1996 Prelude
1997-2001 Prelude
1995-1998 Odyssey
All use Denso Alternators, some are 80 AMP some are 90 AMP and they are all physically the same size. The pulleys might be slightly different diameter, and the plugs on the older ones are big and round and the newer ones are small and square. All the wires are the same color and the same orientation. They are all CCW rotation
V6 Hondas spin CW unlike the older B, D, F, H series honda motors which spin CCW
The newer V6 alternator
CAN be made to work on a 4 CYL H or F. Its physically the same size so it will bolt right up. The belt tensioner can take up the slack if the pulley is slightly different in size. It has the smaller square plug so 97-01 preludes and 98-02 Accords it will plug right in. Older Accords / Preludes can swap plugs on the harness.
An alternator does not care which way it spins. You can spin it CCW or CW and still make the same power. The only thing that can pose an issue is the internal fan that is inside the alternator. This fan blows air accross the heat sensitive components in the alternator. Alternators get hot when they make electricity. This fan is on the spinning alternator shaft and needs to blow air in the proper direction to cool the correct side of the alt.
I'm not sure if DENSO alternators have a fan that will blow in both directions. From the pictures I've seen it looks like the blades are actually reversed from CW to CCW.
All you would have to do in this case is take your alternator fan from the inside of your Accord or Prelude alternator and swap it into the Alternator from the Odyssey. Now you have a 130 AMP
CCW Odyssey alternator
For me, I have a 80 AMP alternator on 1997 ACCORD. I am putting in some beastly SPAL radiator/AC fans from a maserati that draw 40-45 amps when they are both on. I'm worried about my alternator not keeping up when the A/C is on and the headlights are on and the radio is on etc. The 130 AMP alternator from the 99-01 ODYSSEY seems to be the perfect solution for this problem. It compensates for the amps that my fans are going to use and even adds some extra.
Reason to get this instead of an aftermarket alternator that is "high amp"?
Its OEM Denso / Honda. It will make 14 volts at idle-unlike many "high amp" aftermarket rebuilt alternators that don't make **** for volage untill you rev them up. Which is useless for my situation since I want my A/C fans to be on and my A/C cold at idle.