Oracle convert function

Friends and Gurus,
Table: comments
column: c1
characterset: WE8IS08859P1
I am trying to use Oracle convert function to identify rowid's where column length greater than 4000 characters.
Table comments was created under 'WE8IS08859P1' characterset and I'm moving this table to 'AL32UTF8'.
I don't have csscan installed so trying to query sql and convert column to 'AL32UTF8' characteset and find rowid's to fix.
I have tried below but doesn't help
SELECT MAX(length(CONVERT(c1,'AL32UTF8'))) FROM comments;
SELECT length(CONVERT(c1,'AL32UTF8'))
FROM comments
WHERE length(c1) > 4000;
did anybody faced similar issue?

Hi,
Whenever you have a problem, please post a little sample data (CREATE TABLE and INSERT statements, relevant columns only) from all tables involved, so that the people who want to help you can re-create the problem and test their ideas.
Simplify the problem as much as possible. For example, instead of looking fro strings that have more than 4000 characters (or bytes), post a problem where you want to find strings longer than 4 characters (or bytes).
Always say which version of Oracle you're using (for example, 11.2.0.2.0).
See the forum FAQ: https://forums.oracle.com/message/9362002
Are you interested in the number of characters, or the number of bytes? Use LENGTHB if you want the length in bytes.

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My source DB is : US7ASCII
My target DB is : AL32UTF8
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Thx,
Vi.

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