Replacing Risers/Elbows and Exhaust Manifolds on a Ford/OMC Cobra 5.8 Ltr

[KM7]

I'm replacing the risers/elbows and exhaust manifolds on a Ford/OMC Cobra 5.8 Ltr

I started this with the post: "Overheating Possibly Caused by Restricted Thermostat Housing Port". Now I know that the thermostat housing may have been contributing to the overheating but I will change the risers and the exhaust manifolds. I wanted to start a now post with a better subject.

This a 1991 motor from a 1992 Four Winns boat with a 5.8 Ltr Ford and OMC Cobra. The exact motor model number is: 584APLRGD.

I have already got the risers. Next I'm looking for the exhaust manifolds. The part numbers are P/N 3852347 Replaces 0914898.

I wanted to show pictures of the old manifolds now that they are off. I also took pictures of the mounting surfaces on the block.
Any comments or observations?

 

[KM7]

Here are pictures of the starboard side. Any comments or observations?

 

[Bondo]

Ayuh,.... You've got alota cleaning to do,.....
Once cleaned, then inspections can be done,....

 

[KM7]

Ayuh,.... You've got alota cleaning to do,.....
Once cleaned, then inspections can be done,....

I think that you mean cleaning the block, right? You had earlier said that the exhaust manifolds must be replaced. What would you suggest for cleaning the engine block and the mounting surface?

 

[Bondo]

Ayuh,..... I use rol-lock abrasive discs on my right angle die grinder,...