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Disaster Mercruiser 228 - cracked block

B

Barney96

Member
Have water in oil (milky oil) - engine is 1979 Mercruiser 228 - 305

Is it possible to replace the block with an automotive 305 Chevy block

l live on this boat so l do not go cruising - it is basically from launch to slip - then slip to haul out

Thank you
 
There are hundred of thousands of marine 305/350 blocks available.There is ZERO need to use an automotive block,

I see many 100% drop in on Facebook Market place. I would believe any 305 or 350 Pre 1987 (1987 was a change to one piece rear main seal).

A 350 is the same block for all basic purposes as all the external parts will bolt up to both 305 or 350. So that doubles your choices. The main differences are cylinder bore diameter and heads (heads for a 305 are a little less performance capable only)

You should do some research as you may be surprised what available and how much it may cost.

Just looked on FB and found a complete drop in 305/228 230hp for $1000.00

Facebook

www.facebook.com www.facebook.com
 
kghost said:
There are hundred of thousands of marine 305/350 blocks available.There is ZERO need to use an automotive block,

I see many 100% drop in on Facebook Market place. I would believe any 305 or 350 Pre 1987 (1987 was a change to one piece rear main seal).

A 350 is the same block for all basic purposes as all the external parts will bolt up to both 305 or 350. So that doubles your choices. The main differences are cylinder bore diameter and heads (heads for a 305 are a little less performance capable only)

You should do some research as you may be surprised what available and how much it may cost.

Just looked on FB and found a complete drop in 305/228 230hp for $1000.00

Facebook

www.facebook.com www.facebook.com
Click to expand...
Thank you so much for this valuable information.
Two things confuse me
I - l definitely drained the Block.
2 - There is a large amount of oil in the Bilge
I discovered the milky mixture when I removed the fuel pump
 
Don't know your location but if your in salt water it could have just rusted through. If it did crack then when plugs were pulled there might have been enough crud in the block to plug the drain. This is the reason it's best to use a screw or stiff wire and poke in the drain hole

Oil in the bilge look at the oil pan, might have also rusted through

You can use a auto block but would need to replace freeze plugs with stainless or brass. Then change head gasket to marine. Do not use the carb, starter, alternator, fuel pump, or ignition from the auto
 
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