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  1. #1

    Arrow 4.3L V6 Silverado ~ Information and Advice

    Hello,

    I've been searching for threads concerning this motor and cannot locate ?
    is there any info on the forum ?

    Thanks in advance

  2. #2
    Jr. Apprentice
    Join Date
    Nov 2011
    Location
    Montpelier, Ohio, United States
    Posts
    16

    Default

    Take everything I say with a grain of salt because I'm neither a GM engineer nor an ASE certified mechanic. Just a shade tree mechanic truck owner.

    i had a V-6 4.3 in my 1990 work truck 1500. Essentially it is a 350 V-8 with two cylinders lopped off.

    that beng said its as reliable as the venerable 350 in my mind, only 3/4 of the stock power.

    Here is another added bonus that I took advantage of when I had that. A lot of parts like valves, rockers, pushrods, pistons, rings, conn-rods, etc etc are same as a 350. Sure if you buy stuff in a kit for an 8 cylinder you'll have two of everything left over, but it gives you options. I put aluminum connecting rods, .060 oversize pistons after a bore out, sodium filled valves, roller rockers, moly push rods, etc. all performance stuff from 350 that fit my 4.3.

    For stuff that's 6- cyl specific, Edelbrock made a performance intake manifold for the GM 4.3 specifically. And either Edelbrock or Holley (forget which now) had a high output, larger bore TBI injection unit. Forget which manufacturer had the headers, I think either Hedman or Hooker (again specific to the 4.3). I think the cat back exhaust was the same for that model & year regardless of engine and the glass pack was, well, just a glass pack.

    The only thing that was "out there" that I didn't put on was the Vortec supercharger package that at the time (about 1998 or so) was nearly 3 grand by itself.

    Bottom line, it's never going to be a V-8, but it is something you can have fun with if you'd like.

  3. #3

    Default

    Thanks Johnny, sounds like your engine will be quite a performer
    compared to the stock 195 hp motor

  4. #4
    Jr. Engineer
    Join Date
    Aug 2010
    Location
    eas' bum fuk, maine
    Posts
    207

    Default

    @dark star, iv got a 4.3 in my '02. what year is yours? if you have the "spider" injections system in yoru truck and its the poppet style injectors then you can upgrade to the electronic injectors.

    in my truck i have trimmed the butterfly baffle in the throttle body, installed a flow master muffler, added a k&n drop in filter and drilled a lot of 1/2" holes in the bottom half of my air box. next week the truck is getting a tuned pcm as well.
    "i dont think you got the picture. i got a beautiful picture. this baby happens to have an extra turn of speed, which is the only thing i care about. you dont understnad what happens do you? they make cars. they make 'em exactly the same way. one or two of 'em turn out to be something special. nobody knows why. i know why. i may be kiddin' myself, but i think i can make somethin' out of that sad little bucket of bolts." ~ Tennessee Steinmetz

  5. #5

    Default

    Quote Originally Posted by a.graham52 View Post
    @dark star, iv got a 4.3 in my '02. what year is yours? if you have the "spider" injections system in yoru truck and its the poppet style injectors then you can upgrade to the electronic injectors.

    in my truck i have trimmed the butterfly baffle in the throttle body, installed a flow master muffler, added a k&n drop in filter and drilled a lot of 1/2" holes in the bottom half of my air box. next week the truck is getting a tuned pcm as well.
    Mines an 09, i'm not a mechanical genius.
    so most of this is over my head.
    just looking for the pro's and con's of the 4.3l

    Thanks for the responses

  6. #6

    Default

    On a side note, this motor gets better gas mileage than my old Toyota 3.0L V6 all day long.
    I guess technology has progressed a long way from 1991

  7. #7

    Default

    It'll be real interesting what they get out of the new 4.3L in the just announced 2014 trucks. Some expect at least 315 HP and 25 MPG. Hopefully we'll see the real numbers soon.

  8. #8
    Jr. Engineer
    Join Date
    Aug 2010
    Location
    eas' bum fuk, maine
    Posts
    207

    Default

    Quote Originally Posted by Nargg View Post
    It'll be real interesting what they get out of the new 4.3L in the just announced 2014 trucks. Some expect at least 315 HP and 25 MPG. Hopefully we'll see the real numbers soon.
    if thats the case id like to see what they do to the engine to rework it. i feel like the engine is maxed out for its potential as it is.

  9. #9

    Default

    You'd think they are maxed, but there still seems to be a lot of technology up GM's sleves these days...

    http://www.thecarconnection.com/news...e-technologies

    GM says that the engines are completely new, and they “share only a handful of parts with previous Chevrolet and GMC engines.” The automaker calls them “the most technologically advanced engines ever offered in light-duty pickups.”

  10. #10
    Jr. Engineer
    Join Date
    Aug 2010
    Location
    eas' bum fuk, maine
    Posts
    207

    Default

    sounds like the 4.3 is going to be more related to the newer engines then it is the older ones like we have now.

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