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    Built 350 or cammed 5.3l swap

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    HeavyChevy77
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    Built 350 or cammed 5.3l swap

    Post  HeavyChevy77 on Fri Mar 06, 2015 12:47 pm

    Hey guys I'm getting some $ from going to school and am thinking about either building my 350 from the ground up or go modern with a 5.3l outta a Silverado and put a cam in it
    Options:
    350 2Bolt Main
    Arp Studs on Heads Bolts on crank
    New Bearing/Gaskets
    Iron Camel Hump Heads 2.02 intake 1.60 exhaust
    Speedmaster Holeshot Series Intake (Already installed a preforms great)
    Keep the Qjet
    Flat Top Pistons
    Comp Cams Pushrods & Roller Tip Rockers 1.52
    Comp Cam High Energy Camshaft (CARB Approved)
    Duration @.050 : 206*int 206*exh .425 lift both intake/exhaust 110* lobe seperation
    It was gonna be a 9:1 compression motor with a Corporate GM Blue Block and Everything else chrome (intake/oil pan/timing cover/valve covers/pulleys)

    5.3l Gen lll/lV
    Start with a bone stock 5.3 New rings/bearings/gaskets
    Slap a z06 cam and valve spring (beehive from comp cam) that should be smog legal since it stock gm part
    Convert to OBD-ll
    Mod Gastank for fuel pressure sensor add electric fuel pump and regulator
    Install Emissions Related equipment
    Have pcm custom tuned

    I'm torn between two options either build a bad 350 but still suck down gas
    Or lose the weight Nd go modern with fuel injection same power or more and better mpg but go tru the complexity of the swap but the homie can get me a 5.3 for about $500

    Ive been researching different installs and taking notes on the potential of the 5.3
    Also I've talked to the schools state ref and he said I can do the 5.3l swap just gotta have all the emissions crap hooked up.
    Thanks for your guys honest opinions.
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    Myloth
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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Fri Mar 06, 2015 3:52 pm

    I've read a bit on the 5.3l\6.0l swap and know few people local that have them and love them. I have so much

    SBC stuff otherwise I'd go for the 5.3l they are dirt cheap and make the same hp as a 350 easily and run better.

    The only cost is the conversion flywheel, MSD box etc etc but not really that much I figured around an extra 800

    to convert and the 6.0l is a beast but not as cheap to come by as the 5.3.
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    Re: Built 350 or cammed 5.3l swap

    Post  HeavyChevy77 on Fri Mar 06, 2015 5:17 pm

    Myloth wrote:I've read a bit on the 5.3l\6.0l swap and know few people local that have them and love them. I have so much

    SBC  stuff otherwise I'd go for the 5.3l they are dirt cheap and make the same hp as a 350 easily and run better.

    The only cost is the conversion flywheel, MSD box etc etc but not really that much I figured around an extra 800

    to convert and the 6.0l is a beast but not as cheap to come by as the 5.3.

    I was looking at goin FI instead of carved cause the intakes done have egr
    I heard I can use a th400 torque converter with th350/2004-r and it'll clear.
    I would need a wire harness made , fuel system retro fitted , buy a oil pan from chev performance $150 and a z06 cam springs and new lifters.
    They cheap ness of the sbc is why I'm hesitant. The simplicity and reliability.
    And the people who have swapped, would they do it over again if they had the choice or would they say I should have done it sooner.

    The 5.3 sounds tempting less gas more power less weight more challengers and mustangs I take Smile
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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Fri Mar 13, 2015 12:59 pm

    The 5.3l with aluminum heads only weighs in at 460 that is pretty light compared to 350 or even a 305 close to

    hundred pounds in savings.
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    Sweet Seventy9
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    Re: Built 350 or cammed 5.3l swap

    Post  Sweet Seventy9 on Fri Mar 13, 2015 3:33 pm

    HeavyChevy77 wrote:I was looking at goin FI instead of carved cause the intakes done have egr
    I heard I can use a th400 torque converter with th350/2004-r and it'll clear.
    I would need a wire harness made , fuel system retro fitted , buy a  oil pan from chev performance $150 and a z06 cam springs and new lifters.
    They cheap ness of the sbc is why I'm hesitant. The simplicity and reliability.
    And the people who have swapped, would they do it over again if they had the choice or would they say I should have done it sooner.

    The 5.3 sounds tempting less gas more power less weight more challengers and mustangs I take Smile

    It'll be more expensive but if you can afford it go with the 5.3, you'll be way happier.
    Make sure to get one complete with the engine controller, the starter, and both exhaust manifolds. Cats too if you can.

    They're pretty tough so unless it has real high mileage it probably won't need rings, bearings, etc. but that's totally up to you.
    You can use the stock harness, just remove any unused wires, or you can purchase a ready made Plug-and-Play wiring harness from several places for cheap.
    Use a gas tank from an LT1 equipped B-body. They're already setup with a return line for FI. Try to get a plastic one, they're better.
    You can use stock Impala SS fuel lines from the tank to the engine compartment.

    Idk about the Z06 cam though..... that's an awfully big cam for a 5.3. You have to match everything together or it'll run poorly.
    Have others used it successfully in a big heavy B-body with the same or similar transmission, torque converter, and rear gearing you'll be using?



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    Re: Built 350 or cammed 5.3l swap

    Post  HeavyChevy77 on Fri Mar 13, 2015 3:43 pm

    i was debating between building the engine (new crank, rods,piston, rings/bearings,cam ,valvetrain ,heads) it was about 2300$ 
    the 5.3 is around the same price with all the extra stuff (new wiring fuse box, and maybe re-ring the motor) i could keep the cam and just tune it but ive seen the 6.0 cam will bump up the numbers a little ..i am now reconsidering the z06 cam since the low end torque suffers too much even though the hp gain is excellent.
    with a heavy b body itll sound like a vtec motor reving all high and no low end power
    As for the gearing i running a stock impala ss rear so its 3.08 gearing 
    I want my cake and eat it too..power &mileage
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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Fri Mar 13, 2015 5:29 pm

    I feel that power& MPG main reason I bought a 200r4. Stock they do pretty well in a full size truck getting over

    20mpg hwy that's not bad.
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    Re: Built 350 or cammed 5.3l swap

    Post  HeavyChevy77 on Fri Mar 13, 2015 5:37 pm

    Myloth wrote:I feel that power& MPG main reason I bought a 200r4. Stock they do pretty well in a full size truck getting over

    20mpg hwy that's not bad.
    let me know when u slap that 200-4r in and the mods needed 
    im like half and half about either way 
    oneside says build the 350 i got all the dress up stuff already and am familiar with it
    the other side say go modern since im in the process of rebuild a 5.3 in the class shop so im familiar with the engine 
    Funny how similar the two blocks are
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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Fri Mar 13, 2015 7:11 pm

    The similarities aren't surprising considering it took GM 30+ years just to reengineer the SBC. They definitely fear change at

    GM.

    Yeah the 200-4r(I always mix that up ) will be very soon as my 305 is getting pulled soon and I'll yank em at the same time.

    And try to do a decent write up of it.
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    Re: Built 350 or cammed 5.3l swap

    Post  GM B-Body Forum on Sat Mar 14, 2015 11:52 am

    If it were me, id get a lq9 and drop it in, thats a 6.0. But id probably convert it to carb, that way i wouldnt have to use the drive by wire throttle body. Though i think the earlier ones were drive by cable, well at least the ls1s. It seems thats the route everyone is going now, so to be a tad different i kept the old school 350 and put vortec heads on, with those and a cam i can hit 400hp easy and cheap, its been done a million and one times. Now if i really had the cash id have a 427 small block built, 700hp naturally aspirated, ive priced a few out, right around $15,000. But yeah... Anyway the 5.3 are plentiful and cheap, most of them are iron blocks just with aluminum heads so the weight savings isnt huge, around 50lbs from an old iron headed small block. Anyway, thats up to you and id probably go for it!


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    Re: Built 350 or cammed 5.3l swap

    Post  HeavyChevy77 on Sat Mar 14, 2015 12:09 pm

    yea the 6.0 would be better but use more gas 
    i would love to carb these motors but i live in california and have to smog my 77 every 2 years and the carbed intakes have no egr.
    same goes for vortec heads they dont have egr provisions on the intake 
    i wanted to slap those heads on my 350 but have to settle for camel hump heads.
    i starting to lean to build my 350 since i got it but would love to slap that 6.0 in a 60's el camino
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    Re: Built 350 or cammed 5.3l swap

    Post  GM B-Body Forum on Sat Mar 14, 2015 5:13 pm

    oh dang i forgot you lived in cali, and those darn emissions


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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Sun Mar 15, 2015 1:48 pm

    How about a 602 crate motor BBC , I just helped neighbor move one for his brother's stock car they

    put it on a test stand and fired it woohoo flames came right to the mufflers lol.
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    Re: Built 350 or cammed 5.3l swap

    Post  spearwarrior on Wed Mar 18, 2015 6:17 pm

    I chose to swap in a 6.0, though I haven't finished yet.  I have most of the parts needed for the conversion.
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    Re: Built 350 or cammed 5.3l swap

    Post  spearwarrior on Wed Apr 22, 2015 8:45 pm

    I also failed to mention that i have a 78 caprice and a 78 impala, the caprice engine is complete and passes smog all on its own here in socal.  I've got smog covered as long as i keep both cars, or i'll register the car in vegas
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    Re: Built 350 or cammed 5.3l swap

    Post  Sweet Seventy9 on Wed Apr 22, 2015 9:24 pm

    Someone to do a NorthStar motor!


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    Re: Built 350 or cammed 5.3l swap

    Post  Myloth on Thu Apr 23, 2015 12:34 pm

    As long as it's has all the bugs removed (not so bad from what I have read to fix) indeed it would make a great

    transplant.

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