Filling holes

[rorx2000@xxxx]

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Can anyone tell me what i can fill the holes on top of the engine, 
under the intake exhaust with. I read a post once that said if water 
and dirt get trapped there, it can eat thru to the metal into the 
engine? Can I fill the holes with something before this happens? 

Thanks
Rory
VIN#3010
"Blade"