I have another theory as to what could be wrong.
The Lost Motion Assembly's could possibly be bad. I think like '97 or '98 and earlier had hydraulic LMS's. Honda changed them to a spring type because of failures with the hydraulic ones. Since my head is from a '94, it would have the hydraulic ones in it.
You can hear when LMS's are going bad because they create a slight knocking noise at certain rpm's. We did find a knocking noise at about 1600-1800 rpms similar to ones we have heard in videos. So we are going to talk it over with the mechanic first before we go buy some new ones and swich them out.
Here is a Link that explains in much more detail about the LMS's. And a how to on switching them out.
http://www.honda-tech.com/showthread.php?t=2564272
You can start hearing it at 3 seconds, gets louder at 6 seconds, and when the rpm's drop you can hear it one last time kind of loud.
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