Rebuilding a omc 56ci block

[phillnjack]

Thanks Fast Fred,
Very glad you told me what they are.
i was wondering about these little holes, they do seem very strange when first seeing them.
at first i thought a hole had burnt through ,then when i noticed all three i knew it must be stock.

So is it a must do to get rid of these when re-building ?
Do they cause a drop in normal compression ? i would think they do to be honest.
and surely a drop in compression = less power ?????
is this just on the 60hp or would the 70hp be the same ?.

and where is the best place to get some parts for a re-build ? please dont say BRP as in the uk they
are just so high prices it ridiculous.

and thanks again for info Fast Fred

phill

[chris3298]

I didn't know you could weld those holes up, I had heard it would have to be re-sleeved and that if you had a later year 56 that you could re-sleeve it to a bridge port if you wanted. I lucked out and someone on this board told me about a motor near me that was a 86 and supposedly this motor is a bridgeport and doesn't have those holes you talk about. I have only been told by a few that the bridge ports are better, time will tell when I can afford to rebuild it this winter.

I have gone to seawaymarine.com and crowleymarine.com sometime crowley marine is cheaper then seaway. I have also had someone send me this link which not sure if these pricers are any better http://www.promarineusaonline.com/ Do a google search and you will kinda part on some sites cheaper then others.

[Fast Fred]

she's just pushin comp and fresh mix out that hole till the rings clear the top of the hole. they need to be lost.

[phillnjack]

I am learning a lot more on this site than i expected to.
so many people with great knowledge of the outboard engines .

great stuff


phill

[calvin]

I have 1986 56 incher...does it have the holes?

[chris3298]

I have 1986 56 incher...does it have the holes?

I don't believe it does.

[sheuninck]

that may be the only year that does not have it

[chris3298]

I don't remember where but seems like someone had told me that the 86-87 56 had the bridge ports and I thought this person said these years didn't have the hole that the 1988 had it but don't hold me to it, it's just what I think had heard.

[LittleCharger]

The bridge port motors do not have the compression relief holes. The 1986 56er is a bridge port motor.

[Per]

The bridge port motors do not have the compression relief holes. The 1986 56er is a bridge port motor.

My -91 56CI bridgeport has them so perhaps it is a question of when they are built...
I'm about to tear down a -92, wonder what's inside that one