Yeah, thanks. Thats what I plan on doing. Its still too cold here to take the boats out for a rip. Maybe next week...In the meantime Im keeping it inside going through everything on this one for the first time. (purchased in NY 4 weeks ago)
thanks for the input

MEFI was not around in the 80's. This has a ECU like what the Merc outboards had . Diacom nor a Merc DDT will scan this engine. Its a special Merc diagnostic tool that reads the ECU. I have it and the manual that goes along with it. It is nothing like the current marine scan tools. There is most likely Service Bulletins on this for the timing differences - you need to post your engine serial numbers.

hi, i did post them
here they are again
serial no on motors
stbd-b858846 port-b858853

thanks

1986 was 8 deg btdc mercruiser changed all initial timing to 12 deg btdc. Everything was to be changed in owner manuals and service manauls and on stickers on the engines. This took place oct 1986 forward. As i recalled there was a service bulletin all about it actually 3 on timing and a bunch more service bulletins for the 320 efi

Wow. cool thanks for the reply/info. Do you know how I can get any of these service bullitins?
thanks

Do you know how I can get any of these service bullitins?
thanks

Sorry I have been super busy as you know all Merc dealers will have this and can even pull them up thru Mercnet.
Back in the day they were sent to us as they became available thru Merc in paper format. I have a huge binder full of them from the 80's and 90's till early 2000's as when Merc and other OEM's were changing directions from paper to internet based info

My binders are in storage - Most of my work is 2004 to brand new boats so I put alot of this older stuff in storage. Most likely when I can take break could dig out the huge binder and go thru all the related material for the 320 EFI. There was alot of info for diagnostics as well in the late 80's for the 320 EFI. As it stands currently. I am booked till June 1 so really can not put a timeframe looking for all this info. Sorry about that but you know how it is being in the biz, have to get down and make the donuts as its that time of the year.

Thanks for the reply. Dont worry about digging out the old bullitins. Not needed at this point, thank you though for the info. hopefully wont need later lol