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Thread: 350 to 454 swap

  1. #1

    Question 350 to 454 swap

    I am wondering if some people could shed some light on an engine swap (from a 350 to a 454) and what all effort was involved to ensure that the vehicle will operate in optimum condition?

  2. #2


    Need more enough on your truck to even begin helping you out
    2009 chevy 1500 z71 4x4
    2.5 ccm level,2.5 inch rear blocks 305/60/18 coopers stt,Debadged,10 series flow w/dual exit in front or right rear tire, KN CAI, diablo InTune, 18% tint all the way around ,spec-d euro headlights with black housings,winjet smoke LED tail lights,putco LED third brake light smoked, fab fours front bumper with 10k warn winch, RK sports ram air hood
    1965 c10 swb, zz4 350 with the hot cam and fast burn heads and a 780 Holley on top, richmond super street 5 speed,restorod

  3. #3


    It usually involves re-flashing your computer for the year of the 454 (if you get one with a computer in the deal you don't need to do this) and would probably be best if you hooked it onto a 4L80E transmission. That involves fabbing a new trans mount if you have a 4L60E since the 4L80E is longer. Shorter driveshaft as well and if 4x4 a longer front driveshaft I think.

    Also a full wallet as 454s are gasaholics. Another option could be a 383 swap. Direct drop in, no re-flashing, pretty much same power in a smaller block.

    If at first you don't succeed, get a bigger cheater bar.

    1999 GMC Sierra SLT Z71 | 5.3 "Vortec" | Spectre "Cold Air Intake" | TransDapt TBS | Hypertech 30005 Tune | 2005 Chevy Tail Lights | Denali headlights | Grill Mounted Fog Lights | AWS Bug Shield | 265/70/16 Futura Scramblers | Boss HD Speakers | 2005 Overhead Console | Flowmaster Super 40 mufflers 2N1O | Mostly stock-ish
    Bigger Amp Alternator | Electric Fans | Transmission Fluid cooler | Paint (Halfway there)| Interior Restoration/Upgrade with newer model parts | Window Visors (In channel) | Tint | Low-Profile Tool Box | LEDs throughout stock cab locations (68% Done) | And whatever is spurr of the moment
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  4. #4


    what he said^^^^^

    2006 Duramax LBZ
    Edge Evo
    4'' Diamond eye to 6'' tip
    16'' ion alloy, 33'' fierce attitudes
    Lots of work left to do!

  5. #5


    Add in a new set of front springs because the 454 is a bit heavier than the 350. But a lot is gonna depend on the year of the vehicle it's being dropped into and the year of the donor vehicle, almost every year engine has little differences that make swaps a challenge every time.

  6. #6


    Well to be more clear, it's a '93 Silverado K1500. I was wondering about the engine mounts... Would those for a 350 be enough for a 454? And yeah, I do realize that about the poor fuel economy. However, if I would decide to go with the 454 (maybe in the future) it would just be for special uses (towing, hauling, etc.), not my daily driver. Thanks for the help!!!

  7. #7


    Don't forget about that poor lil 10 Bolt out back. You'll need to upgrade to a stronger rearend. The 10 bolt was never designed to handle big block torque.

    97 Chevrolet Suburban K1500 5.7L
    78 GMC High Sierra K1500
    Fat, drunk, and stupid is no way to go thru life.

  8. #8


    In general, it's not worth it to put a 454 in unless you just HAVE to have the bragging rights to say you have a 454 in your truck. The 454 will have to be backed up by a TH400 or 4L80E if you want it to survive. Then you have to deal with the computer and wiring harness, and while you're at it, you better swap out the 10-bolt out back like Boonduff said to a 12 or 14-bolt. Plus you have to put in a bigger radiator to support the extra heat, and on, and on, and on....

    Me, I'd build up the 350, maybe throw a 4L80E behind it, and have some fun and upgrade everything else as time and money allows.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 277K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  9. #9


    Good point there, Crawdaddy (and everyone else). The easiest method would be to buy a truck that came equipped with a 454 from the factory. LOL, there's a WHOLE lot of work involved based upon what everyone else has said! This thought had crossed my mind for an engine swap as a possibility one day. However, I am proud of my 350. But on the other hand, like with so many other parts of life, it's all what someone is willing to put into something. Effort goes a long way! Thanks for the advice everyone! Much obliged! I'll have to do some research into the 4L80E transmission... That has me curious. Talk about food for thought... Mmm!! LOL.

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