Are they the same setup???

travo87 · Jan 19, 2025

A 350 5.7ltr vortec and a 454 7.4ltr vortec out of both a 97 gmc sierra the same setup. I know the difference is the cu in displacement but if I was to take the 454 out of a 3500 could I just swap it into my 1500 without having to take anything else like the wiring harness and computer or is there a difference????

Big Mama · Jan 19, 2025

There are many differences. I can’t recall if the 97 1500 had an option for the 454 so the motor and trans mounts line up. @Doubeleive can probably give a snapshot of what you’d need.

Doubeleive · Jan 19, 2025

Big Mama said:
There are many differences. I can’t recall if the 97 1500 had an option for the 454 so the motor and trans mounts line up. @Doubeleive can probably give a snapshot of what you’d need.

I couldn't offer any advice on this one maybe @97YukonNZ ? @swathdiver @07Burb
I haven't owned a obs in too long, last I had I pinballed on a overpass wayback around 2000 and totaled it.

97YukonNZ · Monday at 3:04 PM

Doubeleive said:
I couldn't offer any advice on this one maybe @97YukonNZ ? @swathdiver @07Burb
I haven't owned a obs in too long, last I had I pinballed on a overpass wayback around 2000 and totaled it.

Sorry just saw post.
I am not any help with a big block answer.
My 97 is a 350 vortec small block and is the only American vehicle i have owned so I'm learning about it as I fix stuff on her.
Lol

I can help with Suspension mods for lowering and brakes and a small amount of lighting.
Cheers

Are they the same setup???

travo87

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Big Mama

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Doubeleive

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97YukonNZ

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