Small block be big block engine pedestal

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H

HenleyTX

Junior Member
Joined
Aug 1, 2024
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3
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Location
Conroe, TX
First Name
Brett
Truck Year
1985
Truck Model
1500
Engine Size
4.3
I have a 1985 GMC I’m installing a 454. Does a big block use the same frame pedestal as a small block? The part that goes from the crossmember to the frame.
 
85K304SPD

85K304SPD

Full Access Member
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Mar 29, 2022
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Location
Las Cruces, NM
First Name
Richard
Truck Year
1985
Truck Model
K30
Engine Size
402
The big block will bolt right into the small blocks place. Buy the small block motor mounts for the truck, not the ones for the big block motor.
Show us what you are working on.
 
Blue Ox

Blue Ox

Turning Diesel Fuel Into Fun
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LI-NY
First Name
Derek
Truck Year
MCMLXXXV
Truck Model
K20HD
Engine Size
6.2L
The above is correct. Yes, but no. Things will bolt up, but it won't be what GM intended. I had the same issue with the diesel swap. Bigger motor mounts and different perches.
 
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