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Mods for a 454 TBI

Discussion in 'High Performance Mods' started by Texasgordo, Mar 21, 2012.

  1. Texasgordo

    Texasgordo Beer Drinkin' Champion

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    I bought a 1990 GMC dually. The engine has low miles on the rebuild and it runs ok right now.

    Has anybody modified this type of engine? Any tips and easy, cheap upgrades?

    It has long tube headers and dual exhaust right now.:thumbs:
     
  2. slims

    slims If you cant have the truck you love, love the truc

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    I dont know any cheap mods
     
  3. buRRp

    buRRp Moderator

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    Pics of said truck?
     
  4. Zembonez

    Zembonez живи свободно или умри

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    Those engines responded BIG TIME to cam upgrades. They were detuned from the factory. Not exactly a cheap or easy upgrade though.
     
  5. dirtyoldman

    dirtyoldman I'm now on Medicare,officially old.

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    First off,welcome back Armando,long time no see.

    I have a 454 TBI also...the first and easiest thing to do is advance the timing maybe 4*.I've had two other 454s and they both responded well to a little more advance in the timing.If it starts to ping under load retard it a little(or buy 91 or 93 octane gas),maybe a degree at a time.Advancing the timing seems to wake 'em up some.

    I installed a new cam and lifters(almost four years ago) with a little more lift and it helped some.In retrospect I should've gone with more lift and put a set of good heads on.I've been eyeing a set of nice looking heads from Edelbrock lately but just can't find the $ :(

    Edelbrock also makes a TBI intake for these engines,I had one in my hands at home and saw that the EGR valve location was different on my '95 so I sent it back.....big mistake,I later found out there's an adapter made(forget who)to fix this.Check out p/n 3764 in their catalog.

    Changing the gear ratio in the diff(s) will help also.I know there will be a rpm change at cruising speed but when you have a monster like this mpg takes a back seat :lol:

    BTW I tow a toy hauler(usually 8,000lbs. when loaded)and this old 454 tows it all day long up and down hills no sweat.The hardest part is getting past a gas station :lol:

    Hope this helps :thumbs:
     
  6. slims

    slims If you cant have the truck you love, love the truc

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    My choices would be intake, cam, heads
     
  7. daddy

    daddy Administrator

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    :lol:
     
  8. slims

    slims If you cant have the truck you love, love the truc

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    Alot of guys with chevy think they needs lots of lift. Im more of a duration kind of guy. :jester:
     
  9. Texasgordo

    Texasgordo Beer Drinkin' Champion

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    I forgot to add that the cam was changed when engine was rebuilt but I don't know the specs or what kind it is.:tmc:
     
  10. Texasgordo

    Texasgordo Beer Drinkin' Champion

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    I don't have the coin for heads but a intake manifold is affordable


    Thanks for the info dirtyoldman:cheers:
     
    Last edited: Mar 21, 2012

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