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5.3 vs 350 vortec

5.3 vs 350 vortec

Postby NC_Cowboy [OP] » May 27 2011, 7:41pm

Last night was test and tune night up here on the 1/8 mile track. Now my buddy has a 98 regular cab 350 vortec with headers a tune full exhaust cai and a 373 posi. that truck goes 9.8 constantly. Last night an almost stock 99 ex.cab had flowmasters and went 9.6-9.7 all night. We had to find out what he was running and it was just a stock 99 5.3. So my question is are the 5.3s really that much faster than the 350s? I know the 98 didn't have alot of work but still I think it should have beaten a stock ex.cab.
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Re: 5.3 vs 350 vortec

Postby lzn197 » May 27 2011, 8:32pm

If memory serves me right, the 350's of that vintage truck have peak torque and horsepower at lower rpm's. The 5.3's on the other hand need to rev. Also the newer vintage trucks have shift points better matched (in stock trim) to keep the iron moving. Both engines can make their share of power but remember, it takes horsepower to move weight and the newer engines are lighter too.
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5.3 vs 350 vortec

Postby fox4wd1981 » May 27 2011, 11:51pm

lzn197 wrote:If memory serves me right, the 350's of that vintage truck have peak torque and horsepower at lower rpm's. The 5.3's on the other hand need to rev. Also the newer vintage trucks have shift points better matched (in stock trim) to keep the iron moving. Both engines can make their share of power but remember, it takes horsepower to move weight and the newer engines are lighter too.


I have to agree fully. When the 5.3 was first introduced it was meant to push the same power as the 350 but be slight smaller and have less weight. Not to mention, the new body introduced in 99 weighed less than the older body. I personally love the 5.3 and think it was a great replacement for the 350 which was a 5.7 if memory serves me correctly.
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Re: 5.3 vs 350 vortec

Postby rdss » May 28 2011, 1:00am

I'm excited to see GM's rebutle to the F words new Coyote 5.0 motor. GM needs some over head cams with intake and exhaust valve timing. I know it's just right around the corner and will probably be pissed when they release it two years after I bought my new truck.
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Re: 5.3 vs 350 vortec

Postby lohchief » May 28 2011, 5:49am

Don't be in a big hurry for overhead cams etc.I had two fords,02 f150 fx4 with the 5.4L cammer 2 valve,and a 05 f150 fx4 with the then new 5.4L 3 valve.......they both sucked.Then there is the cam phasers that wear out beyond warranty coverage and cam followers that wear out and get noisy and expensive.I like my pushrod engines better.Slightly better mpg,good power and less to worry about,imho.I am on,and have been on for many years F**d's x-plan.basically it's like employee discounts,and I drive a chevy.What does that tell ya....
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Re: 5.3 vs 350 vortec

Postby gmctruckguy » May 28 2011, 5:59am

Ya the 5.3's develop their HP and Torque throughout the mid and high end of their RPM band, gives them alot better "get up and go" than the old 350's. And like everyone said now they are alot lighter, although in 1999 they were still a cast iron block I believe.
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