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  1. #1

    Default Engine Swap for 99 Suburban

    Looking for feedback on engine swaps for my 99 Suburban K2500. It currently has 93K miles on on the 7.4L and is beginning to show its age. I am looking to get more power and equal or better gas mileage. I have considered the 8.1L but not sure how difficult that swap would be. Also considered a 502 or 454 crate motor from Scoggins Dickey or GM. Big thing is I want it to work when I am done so nothing tempermental or too techy. Thanks for the feedback.

    Travis

  2. #2

    Default

    i am not sure where you are located but som smog laws may screw you with a motor sawp. you can "Cheat the system with the 502 or 572 as it looks just like the 454 which is installed. I put the 750hp/502 crate motor in my motorhome and it flys and i do not feel the 24' boat being towed, i had to let off the gas on the grape vine i was pushing 70 and not floored. i been getting 15MPG i been very happy. it been 5 years now.

    i do not have any good motor pics....i fix that soon. i just ordered the Doug Thorly tri-Y headers....this is going to be a big beast.....lol
    mike
    Michael Collins
    1993 4X4 Suburban
    many other toys as well

  3. #3
    Jr. Apprentice bkovacs's Avatar
    Join Date
    May 2008
    Location
    Cleveland Ohio
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    25

    Default

    what do you mean showing age? like is it just losing compression? I have the same engine and when I take the intake off I was thinking about doing a head job and since Im going to be that far I was thinking about piston rings also.. you could just go that route
    '99 K2500 Suburban Vortec 7400
    '00 k2500 Silverado Vortec 6000 ex. cab

    '84 K5 Blazer 4x4 lifted (defunct)
    '86 Dodge w250 4x4 lifted (also defunct)

  4. #4

    Default

    No issues with smog so 502 is an option.

  5. #5

    Default

    Quote Originally Posted by bkovacs View Post
    what do you mean showing age? like is it just losing compression? I have the same engine and when I take the intake off I was thinking about doing a head job and since Im going to be that far I was thinking about piston rings also.. you could just go that route
    Lacking power I think it should have. A bit of stumbling on occasion. Eating a bit of oil as well.

  6. #6
    Legend

    Join Date
    Feb 2008
    Location
    Red Wing, Minnesota, United States
    Posts
    3,390

    Default

    the 502 is a straight drop in, even for the 1/2 ton it was made and engineered by gm to be specifically that, no tranny or rearend upgrades needed, as for the 8.1 that would need a new computer at the least as it is part of a whole different engine family and management system then the old small blocks not to mention that many people withthe 8.1 dont get any better performance then the 6.0 in a HD, my uncle hated the big block in his.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  7. #7

    Default

    Quote Originally Posted by vncj96 View Post
    the 502 is a straight drop in, even for the 1/2 ton it was made and engineered by gm to be specifically that, no tranny or rearend upgrades needed, as for the 8.1 that would need a new computer at the least as it is part of a whole different engine family and management system then the old small blocks not to mention that many people withthe 8.1 dont get any better performance then the 6.0 in a HD, my uncle hated the big block in his.
    Thanks for the info. I think I'll check into the 502 route.

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