Big block 454 and small block match up - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-27-2006, 02:28 PM
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Big block 454 and small block match up

hey guys i got a chev pickup with a 454 in it. I want a smaller motor. I got a completely rebuilt 350 and my step dad says the 350 will just bolt right up in place of the 454.

Anybody have any experience with this? i just need to know, because 454's are soo thirsty.

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Old 01-27-2006, 02:36 PM
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its a bolt in with the right brackets & mounts for a small block. & also exhaust manifolds
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Old 01-27-2006, 03:05 PM
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How thristy is it???
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Old 01-27-2006, 03:37 PM
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"its a bolt in" does that mean that the sbc 350 will bolt up to the existing transmission that i have in the truck? it's a 4 spd std. exhaust isnt an issue..got headers for the 350 etc..
someone told me that the 454 motor mounts are the exact same as a small block.. ?
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Old 01-27-2006, 03:40 PM
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You will have to get a different flywheel. The 454 is externally balanced and the 350 is internally balanced.

Dont be suprised if the small blocj is just as bad on gas as the big block......and, a lot less fun.
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Old 01-27-2006, 03:57 PM
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alright thanks guys...so flywheel is basically it?
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Old 01-27-2006, 07:06 PM
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Manifolds, brackets, water pump, pulleys, fan shroud, several other little trinkets and of course the flywheel as mentioned...


Also I like what Poncho62 said...

Dont be suprised if the small block is just as bad on gas as the big block......and, a lot less fun.
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Old 01-27-2006, 07:11 PM
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i got the 454 in a 4x4 truck, it was rebuilt in 99 and old man driven. I got a 350 thats done up with flat tops, 490 cam, ported heads, springs done, valve seals, valves, all balanced, edelbrock 600 on it air gap intake. I wanna do an overhaul on the 454, so i want somethin in place of it so i can still drive my truck.

Now... is there a length difference with the 454 and 350? would i be able to pull the 454 out and basically DROP the 350 in its place with a new flywheel. Thats my main question anything else is no big deal i just wanna know if the 350 will take the 454's place with a new flywheel for a little while
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Old 01-27-2006, 07:25 PM
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To answer yes... The distance from the bellhousing end to the mounts is the same from SBC to BBC... Just use the same "hood" type mounts...


Also here are some pic`s of my truck with the BBC in it...

And here are some of the same truck with the Vortec headed SBC in it... (about a year ago)


Internaly for the SBC... Also in the pic`s I used the exact same mounts and if you notice the exact same brackets and serpentine system with pulleys too... (not real hard to do just some thinking...)

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Old 01-27-2006, 07:27 PM
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alrighty all i needed to know. and i need an internally balanced flywheel or externally? thanks guys big help
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