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I know you've got material on hand, but the foil-backed foam/lead sound insulation material available makes for a tidy installation, and if you put the silver foil side to the engine box you won't be absorbing spills and fumes so much. It can be glued to panels or hung as a curtain. It also won't be leaving stray fiberglass fines anywhere.
If you do use what you've got, maybe encapsulate it somehow.
btw - one of the most effective sound deadening we've ever used was to drape a dentist's old Xray blanket over the block itself! Just watch you don't block the air intake and keep it free of any moving belts/pulleys.
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".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)
1984 Fast/Nicholson 345
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