Firewall Plastic Shroud

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mxer147

mxer147

83 K20, 350 vortec, 465, 208, 14/10, 4.10, 33s
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Feb 8, 2023
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446
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Colorado
First Name
Jack
Truck Year
1983
Truck Model
k20
Engine Size
350
What is the purpose of the firewall plastic shroud? My k20 is the only time I’ve ever seen one. I’m gonna work on the AC evaporator but looks like I have to remove this first and it goes along the entire firewall with multiple parts to remove.
 

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nvrenuf

nvrenuf

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Mobile, Al.
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John
Truck Year
1991
Truck Model
K5
Engine Size
454
The plastic covering only came on diesel trucks. It’s either a heat or sound barrier, I’m not sure which (or both).
 
custodian

custodian

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Catawba
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William
Truck Year
1973, 1985
Truck Model
C10
Engine Size
5.3 LS, 350
I have one on my 85 that had a diesel in it. Had to remove the cover over the heater/ac fan to replace the fan.
 
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