I want to order Service Manuals for 89 454 mags ... There are no serial #'s on the Valve covers ... I believe there numbers on the block but seems near or behind the starter ? There is no way ...... any suggestions ?

I ordered mine thru Mercs publishing department. I think for around $35 a few yrs ago. Even with the engine serial #, the book still covers several motors and yrs.

From BAM website:
http://www.mercruiserparts.com/shopManuals.asp

from Mercury themselves:
https://appcenter.mercurymarine.com/litreq/
The yr and model surely should be enough info. Might call instead of web for assurance.

90-14499-1 will cover it.

Sure about that?

that a serial # ?

Thats the Merc number on my 89 manual. Covers all V-8 engines and systems 89 and earlier.

90-144991 yup thats it.

According to the BAM site, manual # 90-816463 covers 89-92 V-8's. Once you add it to your cart, the price comes down to $36.

Very good manuals.

F31,
Just checked thru my collection
I also have that manual, #9, and it shows up to '88 on page 2.

Ok, this horse is dead.

Opps your right, the manual I listed ends with the 88 models. No diff from 89 but the other manual you listed may be different and more appropriate for the 89.

I hate to do this, but Mercury had their annual price increase Jan 3, and guess what they DOUBLED the price of?

ALL THE MANUALS

Sorry everybody, someone over at Merc must have decided the publications department was not making enough money.