This was the response I got from the OWC technical support. Now I am a little skeptical about giving it a try.
OWC Morgan: [10:28:26 AM] Hello Corey, thanks for contacting OWC Technical Support. This is OWC Morgan. How may I assist you?
Corey: [10:28:26 AM] Question about the 16gb 1066mhz memory kit and it's compatibility with the MacbookPro6,1.
OWC Morgan: [10:28:36 AM] Hi Corey
Corey: [10:28:40 AM] Hey sir.
[10:29:24 AM] I am looking at a 16.0gb PC8500 DDR3 kit on your website.
[10:29:54 AM] Shows specifically compatible with the 13" MacBook Pro ID MacbookPro7,1 2.4GHz, 2.66GHz.
[10:30:42 AM] I have a 17" 2.66ghz i7 MacBookPro (MacBook 6,1). Seeing that they are identically spec'd, shouldn't my MacBook also be compatible with this kit?
[10:31:44 AM] (MacBookPro 6,1) ***
[10:32:18 AM] I should also note, I do have the latest EFI as well.
OWC Morgan: [10:35:25 AM] No. Apple released an EFI update for the MacBookPro7,1 that unlocked the ability to install and utilize up to 16GB. That was not the intent of the update, but it was a result of it. The EFI updates for the other 2010 models did not unlock this ability. We tested all models that use DDR3 memory and only the 2010 13" MacBook Pro, 2010 MacBook and 2010 Mac mini seem to have had this ability unlocked.
[10:36:09 AM] *The EFI updates for the other 2010 MacBook Pro models did not unlock this ability.