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And so it begins........

Swap and other information about GM's LSx series engines

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Bill in NC
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And so it begins........

Post by Bill in NC » Mon Sep 05, 2011 7:33 pm

I finally had some time to go pick up an iron block 5.3 that was given to me.

I also have a deal in the works for a complete aluminum block 5.3 engine, accy's, harness, etc. coming soon from one of our members here.

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78 Malibu
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MalibuRacing.com October 2010 "Malibu of the Month"

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DOUG213XRJ
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Re: And so it begins........

Post by DOUG213XRJ » Mon Sep 05, 2011 7:52 pm

Hey Bill, Very sweet free bee. Is it a runner? Doug
1978 El camino
1981 Malibu SS

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Bill in NC
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Re: And so it begins........

Post by Bill in NC » Mon Sep 05, 2011 10:21 pm

It was swapped at 60k for a suspected cracked head. It was slowly loosing coolant. Not too uncommon for the early 5.3's. My cost on a new casting is right under $100. If I see no signs of burning coolant when I pop the heads I will send them off to check for cracks.
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78 Malibu
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MalibuRacing.com October 2010 "Malibu of the Month"

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t5montecarlo
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Re: And so it begins........

Post by t5montecarlo » Tue Sep 06, 2011 6:23 pm

Very Cool!

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Re: And so it begins........

Post by blu402mally » Tue Sep 06, 2011 9:08 pm

nice score ..bill

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LT1_Malibu
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Re: And so it begins........

Post by LT1_Malibu » Thu Sep 08, 2011 6:02 pm

Looks like you got a heck of deal.
81' Malibu- LS1 forged internals, MS3 cam, stage 1 LS6 heads, TH-350 tranny, 3500 converter.
97' Trans Am- 355 LT1, M6, 3.73 rear
02" Chevy Z71 Ext. Cab

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454RAT
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Re: And so it begins........

Post by 454RAT » Thu Sep 08, 2011 6:18 pm

keep us updated!
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1.51 60ft
10.89 @121.33
461 N/A pump gas

1.45 60ft
6.11 @115
9.74@140
461 with a Novi 2000 on E-85

Thanks to Ultimate Speed and Machine

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Doober
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Re: And so it begins........

Post by Doober » Mon Sep 26, 2011 7:21 pm

Woot subbed \:D/

My dad's '03 5.3 is slowly losing coolant, but you can smell it so I'm not quite sure it would be a cracked head.
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Bill in NC
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Re: And so it begins........

Post by Bill in NC » Mon Sep 26, 2011 7:44 pm

Sure enough the head was cracked on the #6 cylinder.

I have also picked up a 6k mile 5.3 from MalibuKasey in trade for my 355.

Doober, chances are it's the head. I have seen many cracked heads....especially the early Gen III 5.3's, but no blown head gaskets. They will most often crack in the ports. But they CAN also crack outside of the port area leaking coolant right onto the lifters causing the lifters to tick well before you start making a milkshake.
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78 Malibu
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MalibuRacing.com October 2010 "Malibu of the Month"

monte ss496
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Re: And so it begins........

Post by monte ss496 » Tue Sep 27, 2011 12:33 am

any particular reason for the swap, to go faster , better mileage!? just curious as this is a swap i have wanted to do myself,,, :-k
"hands cant hit what the eyes cant see, float like a butterfly sting like a bee , rumble young man rumble"
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Bill in NC
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Re: And so it begins........

Post by Bill in NC » Tue Sep 27, 2011 7:55 pm

Decent fuel economy and still a V8. Decent low end torque for their size. They all (5.3) fall in between 290-310hp. If you keep the carbon from building up in the chambers, they run nice and smooth. 5.3's are a dime a dozen. The next SBC that everyone will have (aftermarket parts availability). The main difference between a 5.3 and 5.7 is bore size and cam. They don't require a zinc additive to stay alive. VVT has been out for a couple of years, so the aftermarket tuners will catch up with this soon and really change the game with the ability to fine tune for max power and drive-ability/economy (I know this is already an advantage of the LS engine, but there is always room for improvement). IMO's

Disadvantages are:
initial cost of the swap
Active Fuel Management engines are known to burn oil due to low tension rings and highway use of the AFM on cylinders 1,4,6,7
AFM engines are also known to sometimes chew up a lifter/lobe.....usually on the #6 cylinder
Last edited by Bill in NC on Tue Sep 27, 2011 8:02 pm, edited 1 time in total.
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78 Malibu
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MalibuRacing.com October 2010 "Malibu of the Month"

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t5montecarlo
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Re: And so it begins........

Post by t5montecarlo » Tue Sep 27, 2011 8:02 pm

Is the #6 lobe issue due to a bad cam design? or a bad oil path design in the block? or a lifter design that is operating on the edge of failure?

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Doober
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Re: And so it begins........

Post by Doober » Wed Sep 28, 2011 11:22 am

I'm pretty sure head design is a big thing too.
http://www.corvette-web-central.com/LS1Head.html" onclick="window.open(this.href);return false;

Look at the port sizes for the 4.8/5.3, that's unheard of for anything besides a street application in an SBC, let alone displacement that small. I don't know what the flow numbers are but they have to be good. I remember reading with just a cam/spring change and injecror upgrade a junkyard 5.3 made about 400hp with just a little low end loss... Another I read was they put the GMPP/Edelbrock coil pack controller on a bone stock junkyard 6.0 and it made somewhere in the range of 425hp/tq. Try that with a production gen I/II SBC!
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Bill in NC
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Re: And so it begins........

Post by Bill in NC » Wed Sep 28, 2011 7:03 pm

Right on Doober.


Marc, I really have no idea as to why it "usually" happens on that cylinder when it does. By everything I can see nothing is out of place. It would take someone with a higher degree than me to explain to me what the cause is. One thing to remember is that there are tons of these LS based (Gen III's & Gen IV's) engines out there running just fine with no problems at all with many abused miles on them. I only see the low mileage (under 100k miles) problems working at the dealership because of the 100k mile powertrain warranties.
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78 Malibu
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MalibuRacing.com October 2010 "Malibu of the Month"

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t5montecarlo
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Re: And so it begins........

Post by t5montecarlo » Wed Sep 28, 2011 7:58 pm

what happens to the motors that are replaced? or are they just repaired?

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