I applied it to the outer skin and it made a huge difference. Not easy but totally worth it! Make sure you cover any holes in the firewall as that will help stop engine noise coming into the cab.

Last edited by Phak1; 04/17/2025 1:15 PM. Reason: Added info

Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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