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Thread: 454 to a 305

  1. #1

    Default 454 to a 305

    I have 2 complete trucks. I have a 89 3500 with a sick 454 gas guzzler and a 91 1500 with a 305 that runs good. I am thinking about puting the 305 in the 1 ton truck, after a rebuild while I have it out, and continuing to use it pulling farm stuff and heavy loads of wood. How much power will I notice loosing and is this a good idea? Most of the miles I drive are on the road but I could be pulling up to 6,000 - 7,000 lbs. at a time when I need it.

  2. #2

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    Though the 305 is a long stroke engine, it won't even come close in comparison to the 454's torque. If you were just pulling equipment around the farm, I don't think that would be too much of a problem, but once you are on the roads, trying to get up to speed, it could get ugly. Obviously this is ultimately your decision, but I think the power loss will be quite significant. Good luck with your decision!
    Jess

    1991 Suburban


  3. #3

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    Is there any kind of chip that can be added or any other modifications that would give me more power and notice less of a difference?

  4. #4

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    Welcome to the G M T C ! I agree, the 454 is a TORQUE monster and the 305 is nearly 180 degrees different.


    2010 Z/71 Colorado C/C
    Black 4X4 w/5.3L V8
    ===============
    2007 Winnebago Adventurer
    w/8.1L Chevy & Allison 6spd.
    Canyon Lake, Texas

  5. #5
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    Welcome!!!


    Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD

    SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
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  6. #6

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    I don't believe any chip will make a dent in the difference. If you are planning a complete rebuild, including higher compression, high flow intake and heads, a fat cam, and so on, then you could make a little more power with the 305. You would spend a LOT more money trying to do that than if you were to throw a decent rebuild at the 454. As always, this is just my opinion on the matter, and if you get some other feedback that you like better, then run with it!

  7. #7
    Sr. Mechanic LSU truckman's Avatar
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    Hi there! Welcome

    Big block rule small blocks have complexes!
    Bobby

    Current Motorvation:
    2011 GMC 1500 4x4 crew / 5.3, 6spd, 342 rears, g80 locker, bone stock
    2000 Chevy Silverado Excab / 5.3, 373 rears, g80 locker, 93 oct perf. tune
    2011 GMC Acadia Denali wifes ride

  8. #8

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    The 305 will eat almost as much gas as the 454 trying to do the same. The best bet is a Diesel engine. or maybe my 350 Vortec...had it in my 1 ton dually for ever and pulls fine, geeting 14MPG with the 350. A 6.5 turbo diesel tund right gets about 22-28 MPG in this same truck, with a lot more tourge then even a 454 !
    But i am glad to sell you either one, 350 Vortec comes with everything you need ...ECM and all for 1500-2000 bucks + shipping.

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC
    WE CAN STICK A DIESEL IN ANYTHING
    SPECIALIZED IN CUSTOM CONVERSIONS OF ANY KIND
    Scott:glasses:

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    Legend Bigbomber's Avatar
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    Welcome to the site!
    [/SIGPIC]2009 Chevy Silverado LT 1500 EXT CAB 4X4 Vortec 4.8L SFI,K&N air filter,Weathertech Floor Liners ,Weathertech Stone/Bug Deflector, Line X Spray On Bedliner, TruXport Rollup Tonneau Cover, Molded Mudguards, Viper 5701 LE 2 way Security Alarm/Remote Starter, Xm Satelite Radio,BILSTEIN 5100 rear shocks,BILSTEIN 5100 front levelling shocks,READYLIFT 2" rear lift blocks,Goodyear Wrangler Territorys -265/70R 17"

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    Welcome to the club Patric
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
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