Quieting dilled exhaust

[silverbullet02]

If they removed the can, the motor becomes extremely hard on the shift shaft seal. Gets REAL hot in there if exhaust can go everywhere. That looks like a poor mod to me. Those holes are not very big. We used to do this back in the 90's, but we would cut a 4" hole in the back of the mid-section to help get exhaust out. We were basically turning 200s into mercury racing motors, that was just one of the many mods needed. Those small holes don't look very useful to me...

I thought merc drilled holes like that at the factory on some of the 260s at one point.

[JOE54]

and promax mtrs

[EuropeanAM]

Depending on the diameter of those holes- you might be able to find casting plugs to fit them. Sure, not perfect but better than silicone and cheaper than welding.

[DC88]

Where do i find casting plugs, not sure what those are

[EuropeanAM]

Napa, Carquest, Etc. Like a freeze plug.

[Dark Allison]

I’ve also seen people fill them with JB weld. It sets up hard as a rock

[Merc2.4]

I've seen em tapped and use npt plugs (or whatever they called) can also (tune) the slip

[EuropeanAM]

I've seen em tapped and use npt plugs (or whatever they called) can also (tune) the slip

Pipe plugs are certainly a viable option- good point. Not sure I understand how they would "tune" the slip, though.