I was wondering if anyone knew where I could get service/owners manuals for my 1987 SR-1 F-311?
I have twin 454 420hp with TRS drives!
Also a simple question (hopefully) what size were the FORMULA letters on the boat in 1987 2 1/4" or 2 5/8" and was the Thunderbird a 5" or 6" I want to get replacements and Im in Scotland now whereas my boat is in the states!
Thanks for the help!

I can tell ya this, you need Mercury Service Manual #9 for the engines and Mercury Service Manual #5 for the TRS drives.
Here's a #9
http://www.ebay.com/itm/Mercury-MerC...81a8b8&vxp=mtr

Here's where you can get both.
http://www.sterndrives.com/mercruisermanuals.html

Or you can get them from Mercury Publications
https://mercnet.mercurymarine.com/litreq/welcome.do

Thanks for the info picklenjim..much appreciated!