How to remove two little screws rusted on Ig Module

[CayugaCobalt]

I have a 1997

MERCRUISER - 7.4LX BRAVO (MPI)(GEN. VI) GM 454 V-8 1996-1997​

I want to replace my ICM ignition control module. What size is the head of the screw?

SCREW (#10-811638) Qty Required For Repair: 2 Supersedes: 10-850494

Mine are severely rusted. Pretty sure they are going to or already are rounded.

Any tips or tricks for getting these two little rusted darlings out?

Drill em maybe?

 

[Paintman1960]

Hold screwdriver in tight, an Rap it with a smaller hammer while turning to try n break em' loose , it can work

 

[Fun Times]

Seems it was found a few years back that these screws from Merc are no longer available but the alternative may be form AC-Delco part number 10469668, https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313&_nkw=10469668&_sacat=0

Ignition module screws

does anyone know what screw size and thread is used to fasten the ignition module on a 2001 3.0 mercruiser? The exact screw has been discontinued and i couldn’t find specs to find a comparable one. I dropped one into the hull of the boat and searched for a long time with no luck. Thanks!

forums.iboats.com

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[CayugaCobalt]

Hold screwdriver in tight, an Rap it with a smaller hammer while turning to try n break em' loose , it can work

They are not slotted; so one option would be to try and Dremel a homemeade slot into them?