contradicting engine specs on spark arrestors
 

Both of these are 1988 mercruiser racing 320 EFI 5.7 liter bravos

Both motors look identical. both flame arestors the same , decals on them the same except the stb one says timing 8* btdc and the port 12* (they may not be on the correct side)
the manual oem mercruiser says 12*
I also have th eoriginal paperwork from Formula test tank inspection on 8/31/87 and both motors had timing at 12* btdc
serial no on motors
stbd-b858846 port-b858853

is this a typo or correct? if correct why?
Also I just happened to look into the stb valve cover where you pour oil into and there are roller tip rockers. didnt check the port side yet
thanks

Are the ignition modules the same or different? V8-24, V8-20 etc.?

same

What ecm is on them, being 88's a mefi 1 ??

ill have to look, they both have dacals on them saying;

5.7 litre efi designed and built by mercury marine performance,
where else do i look?
thx

I didn't even realize merc offered efi then in sbc or bbc.

I put a 0 in front of your serial # on Merc's site,

http://www.mercruiserparts.com/320-e...8-1989-0b15760


It doesn't appear to have an ecm

Might want to set total timing where you want it. Then let the idle timing fall wherever.

it does , go to exhaust manifold on that parts diagrams and look at # 17
11350A8 --------E.F.I. CONTROL BOX ASSEMBLY nla

set them both at 12.