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Topic Review (Newest First)
11-08-2012 08:13 AM
1Gary Well maybe I haven been posting on the forum long enough,but I'm big on torque and not thrilled with hp numbers for a street vehicle.I want better(much better) gas mileage than I would get with a 383 too.Don't care if it is a aluminum block to save wt.Want something that I don't have to worry about cylinders moving around for ring sealing or the bottom end problems if while playing with causes issues.Maybe some sort of stroker combo that still give great gas mileage that I don't have to spin to the moon to get what I want out of it.A rough diamond pick and pull that I could build off it.
11-08-2012 06:21 AM
ap72
Quote:
Originally Posted by 1Gary View Post
Maybe I should limit my search/research for a suggested engine from you guys that I should be able to easily find in a pick and pull.I can tell you that I am not interested in the 5.3's.I seems too small for my purposes.
It depends what your goals are, there's guys pushing over 700hp on stock long blocks. And a 5.3L can be picked up for a few hundred bucks, a 6.0L will cost a few grand, a 6.2L will cost almost 5 grand.

my 6.0l is in an 09 2500hd extended bed, extended cab.
11-08-2012 01:22 AM
1Gary Maybe I should limit my search/research for a suggested engine from you guys that I should be able to easily find in a pick and pull.I can tell you that I am not interested in the 5.3's.I seems too small for my purposes.
11-07-2012 05:11 PM
1Gary What yr is yours??.
11-07-2012 01:09 PM
ap72
Quote:
Originally Posted by 1Gary View Post
That's what I heard while I have been investigating the LSx engines is the 6.0 are gas hogs.
I can't figure out what's wrong with my 6.0L then, i get 18mpg on a bad day, 22 on a good one.
11-07-2012 09:31 AM
1Gary
Quote:
Originally Posted by johnnyg View Post
My dad has an '08 GMC Savanna 3500 w/ a 6.0, on a good day he gets 14 mpg.
That's what I heard while I have been investigating the LSx engines is the 6.0 are gas hogs.
11-07-2012 07:47 AM
ap72
Quote:
Originally Posted by 1Gary View Post
But I an still curious what you guys think was the one thing GM improved on the LS engines that make them perform as they do.
There are many things they improved, not just one. They improved heads, valvetrain, intake manifold, firing order, fuel and spark control, cooling, much more rigid block, better pistons and rings, etc.

If you're looking for just ONE thing then you'll never find it, the difference is because of many changes.
11-07-2012 07:01 AM
johnnyg My dad has an '08 GMC Savanna 3500 w/ a 6.0, on a good day he gets 14 mpg.
11-07-2012 06:05 AM
1Gary My TQ build 383 was 400 lbs at 2500 and just shy of 500lbs at slightly over 4,000.It is 375 at 4500.

LS3 I would have to be very lucky to find a wrecked 2008 Vett will a willing seller that didn't want a fortune for it.It's kewl to pick out a engine here,but the reality check happens when you go for the wallet to pay for it.

The thing I do is I look at the aftermarket for problem solvers in the parts they offer to understand what might be a issue.One common part I see is head gaskets for these or to be fair about it some of the LSx engines.Is that a problem??. Also in the aftermarket blocks some of the features they offer to maybe cure OEM design weaknesses,but there again,that might be just because of the extra stress of power outputs that I would never approach.
I did read about the limits of the OEM head design/rockers for enough space under the rocker covers for a high lift cam.It seems a good set of heads would be in the range of $1,800 to $2,000.

But I an still curious what you guys think was the one thing GM improved on the LS engines that make them perform as they do.
11-06-2012 04:42 PM
ap72 Here is a dyno of a fully decked out 383 GM crate engine.

http://www.chevroletperformance.com/...M_12370838.pdf
11-06-2012 01:42 PM
lmsport Chevrolet Performance #19259233
LS376/525 Engine
376 cu in (6.2L)
525 HP at 6300 RPM
489 ft/lbs TQ at 4400 RPM


11-06-2012 11:45 AM
1Gary I'm just looking at the 383 which by 2500 I'm well into the 4's in TQ and from the Wiki link I don't see that.In you honest opinion what is the single thing Chevy did to make these so much better?? Compression with aluminum heads in used. Try to remember I'm still in the discovery stage on these LSx's and I am seeing some aftermarket parts for them that are priced reasonable and some that are not.
11-06-2012 07:40 AM
ap72
Quote:
Originally Posted by 1Gary View Post
Yes I know this is early on looking into this.It does have me wondering if Chevy by design built these not to gave much output early on and that is the reason for the good gas mileage.
you have that entirely backwards. They have GREAT low end out put and that goes along with good gas mileage. I don't know how you could think they have poor low end.

Compare the 5.3l to one of the original 327's.
11-05-2012 06:25 PM
1Gary Yes I know this is early on looking into this.It does have me wondering if Chevy by design built these not to gave much output early on and that is the reason for the good gas mileage.
11-05-2012 05:26 PM
1Gary I looked at this as a source:

GM LS engine - Wikipedia, the free encyclopedia

Many have a TQ peak at 4,400.Hummm..........
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