98' heads vs 2002?
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HP differences ? they will flow identical , except that the 241 when ported will flow slightly beter and when I mean beter thats a 4-5 rwhp difference.
furthermore, casting are different to.
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All 241/243s were semi-permanent castings.
If you look below each spark plug hole and you see a "triangular chill mark"' then you DON"T have a sand casting!
The traingular chill marks are made in the mold and is used to control the expantion/removal of the head once it's cast. Here's a photo, look below each spark plug:

