Service manual help

[supercobra]

I have a mercruiser 454 gen 4 I think.
Engine tag serial#b830792
Block cast #1401544
Head cast#14092360
I'm changing the cam and need to know about valve adjustment and engine timing and so much more.Some say #16 is the right manual but it's says gen 5 and up.
Which manual do I get or where can I find all the info at?
This is my first post and I'm a new member.
I have a 1986 Baja force 250 with 454.It had many probs when I bought it so I ended up buying a parts engine to get it back to original.but the top end needs replacing due to previous mechanic installing the wrong cam that doesn't have a mechanical fuel pump lobe and it gets worse from there so that's why I bought a parts engine to fix it back but I decided to put a little better flat tappet cam in.

 

[supercobra]

I have a gen 4 mercruiser 454.
I need to know which service manual to use.Some say #16 but that is gen 5 and up I think.
I'm having to replace cam and top end parts and gaskets.So I need to know about valve adjustment procedure and timing procedures and steps to go about it.
Engine block cast#14015445
Id tag #b830792
Head cast#14092360
Please tell me the correct service manual to get.

 

[Fun Times]

Hi, your engine serial number 0B830792 brings your model number up to be 474S110AS which helps show your engine year to be 1988 model year 7.4L BRAVO drive... The engine service manual would be merc part number 90-816463 otherwise known as manual number 15...

https://www.ebay.com/sch/i.html?_nkw=90-816463&_sacat=0&_from=R40&_trksid=p2332490.m570.l1313

The following would be of just a few available engine parts catalogs for you too,

MerCruiser Stern Drive 1988 7.4L [BRAVO] 474S110AS [474S110AS] - Parts Lookup | Crowley Marine

View parts diagrams and shop online for 474S110AS : MerCruiser Stern Drive 1988 7.4L [BRAVO] 474S110AS. Offering discount prices on OEM parts for over 50 years. FAST $4.95 shipping available.

www.crowleymarine.com

https://www.marineengine.com/parts/mercury_marine_parts/sn/0b830792

Genuine Mercury Marine parts, large inventory, fast shipping. 7.4L BRAVO GM 454 V-8 1988-1991 0B771113 THRU 0D603117

7.4L BRAVO GM 454 V-8 1988-1991 0B771113 THRU 0D603117

www.mercruiserparts.com

And here's a bravo stern drive parts catalog too,
https://www.mercruiserparts.com/bravo-one-0b664190-thru-0f729999-1

Also have a quick look at location C for any numbers or letters to check for a few other details regarding your engine model though it appears yours would possibly be letters XW on page 11 of 16,

Client Challenge

 

[jimmbo]

I'm changing the cam and need to know about valve adjustment and engine timing and so much more.Some say #16 is the right manual but but I decided to put a little better flat tappet cam in.

If it is a Hydraulic Cam, then the standard Chevy, One turn in from Zero Lash.
What do you mean by "a better Flat Tappet Cam"? Hopefully you are not making the Mistake of using an Automotive/Truck Cam Grind. Marine Engines require different Camshaft Specs to provide a Torque Curve more suited to the Requirements of a Marine Engine.

 

[Scott Danforth]

Use the block casting to determine if you have a Mk4 block or a Gen V block

Mk 4 361959 or 1401544
Gen V 10114182

To look up casting numbers, go here https://www.mortec.com/bbc.htm

Being 1988 per the serial number makes it a Mk 4, 2- piece block

As indicated above, make sure the cam you choose is a marine cam and has to be below 270 degrees due to tbe wet exhaust