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Thread: 454 Swap

  1. #1

    Default 454 Swap

    Greetings, I was wondering what all would have to be changed out to switch out the small block with a big block?

    1989 Chevy V1500 Suburban 4X4, long tube headers & xover pipe. w/1985 350 4bbl.
    2002 Silverado 1500 5.3L Ext. Cab
    2005 Wrangler Rubicon 4.0L
    1990 Miata

  2. #2


    Pretty much everything. Transmission, PCM, radiator, wiring harness, pretty much everything has to be changed because you're swapping motors and going from a small block to a big block. Doable, yes. Cost efficient, no.

    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

  3. #3


    I see it looks like you have a '85 350 with a carb on your truck now. I don't know your budget but have you looked at the GM crate motor HT502, part # 88890534? It has 377 hp at 4,500rpm's and 512 lb-ft of torque at only 3,300 rpm's. Its made for older heavy trucks.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

  4. #4


    Its actually a pretty easy swap, but remember even a stock smog 454 puts out more torque than your stock drivetrain was designed to handle. It may last if you baby it, but run it hard and it will fail. The stock 700r4 can barely stand up to a stock 350. Your NP241 transfercase will probably be ok, but the 10 Bolt axles will not be happy. Like Crawdaddy said not cost efficient, to make the entire truck reliable you'll have to upgrade the whole drivetrain.
    Last edited by Boonduff; 10-06-2011 at 12:45 AM.

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

  5. #5


    Quote Originally Posted by bigbluesub View Post
    Greetings, I was wondering what all would have to be changed out to switch out the small block with a big block?
    First thing I'd change out would be the size of your wallet!
    I like you.

  6. #6


    Thanks, guess it is more work and money than it is worth. I will work on making a torquey smallblock...

  7. #7


    It is a painful idea, but it is probably cheaper to trade rigs with one that already has a 454 in it. I'm going to guess it is probably a 2500 too, so other side benefits if you choose this path.

  8. #8


    How about bore and stroking your small block to a 383 or a 406?

  9. #9


    I think that is what I will do. I will find a machine shop and get some estimates to compare vs the crate 383.....

  10. #10


    It's still possible to find old rusty Chevy Trucks and suburbans that have big blocks. Then you have everything you need for the swap at a reasonable cost

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