5.7 Hemi V.s 5.3 Vortec

[Silver X]

I'm not sure where you got your info on the Titan because my manuel says 87 octane. Tweny eight gallon tank takes me around 48 bucks to fill. Just some FYI. Still get around 16 mpg though. Not bad considering its A V8 5.6 305 horsepower 9400 pound towing capacity...

[jeverett]

Ahhh man, get a good tune..and have no other option but to burn 93 octane..like me.

[ryanszpara]

where is this video of slow's ???i want to see it

[jeverett]

It was on LS1Truck.com The link's been down for a couple of days though.

[Slowprocess]

Originally Posted by jeverett

It was on LS1Truck.com The link's been down for a couple of days though.

I'll check out the link tonight when I get home, and if it's down, I have another server to go with. I'll post up the other link when I get off of work.

[White Lightening]

Greetings,

You posted:
"If I were getting a new 1/2-ton truck though, I'd go for the 5.3 simply for the extra 35 lbs-tq. I'm not sure how well the 4.8 would handle a trailer weighing around 3500 lbs. I know that's well within their limits, but in the real world, 3500 lbs will effect how a truck performs, especially in a hilly region. Actually, I think if I could get a new 1/2-ton truck, I'd go with the SS and get the LQ9 6.0 with its 345 hp and 380 lbs-tq. A truck like that would look good pulling a racecar! "

Below I posted the link to another thread where I described my new truck - a 2 wheel drive extended cab 1500 with the SS engine, SS transmission and limited appearance wheels, tires, and suspension. Its ALL stock - its 345 hp and I get 19.5 to 20.5 mpg. Lots of power for trailering and I'm almost 500 pounds lighter than an SS or 4x4 and $10,000 less than an SS too.

Didn't mean to intrude - just a thought.

http://www.automotiveforums.com/vbul...d.php?t=328799

White Lightening

[chcknugget]

Hello,
I've been meaning to do an engine swap in my 96 gmc jimmy and I happened to come acrossed this neato thread. Thanks for all the info. Everyone in the blazer thread seemed to think the 5.7 was the way to go, but now I like what the 5.3 can dish out. What kind of aftermarket upgrades does the 5.3 have? I know the 5.7 has about every upgrade known to man...

[chcknugget]

Hello,
I've been meaning to do an engine swap in my 96 gmc jimmy and I happened to come acrossed this neato thread. Thanks for all the info. Everyone in the blazer thread seemed to think the 5.7 was the way to go, but now I like what the 5.3 can dish out. What kind of aftermarket upgrades does the 5.3 have? I know the 5.7 has about every upgrade known to man...

Is the 5.7 lighter than the 5.3?

[Slowprocess]

Originally Posted by chcknugget

Hello,
I've been meaning to do an engine swap in my 96 gmc jimmy and I happened to come acrossed this neato thread. Thanks for all the info. Everyone in the blazer thread seemed to think the 5.7 was the way to go, but now I like what the 5.3 can dish out. What kind of aftermarket upgrades does the 5.3 have? I know the 5.7 has about every upgrade known to man...

Is the 5.7 lighter than the 5.3?

The 5.7L is lighter than the 5.3L. If I were going to do it, I would go ahead and get a 6.0L. Just about every part is interchangeable from the 5.7 and the 6.0L. The 5.7 is an aluminum block(hence the weight), but I just feel the 6.0L would hold up better in a heavier application, such as a truck. Just my

[chcknugget]

My jimmy isn't a fullsize, but currently it has the cast iron 4.3 v6 in it. I've read that either v8 has been seen to get equal or even better gas milage than the 4.3. I was leaning toward the 5.7 because of its aluminum block and because of its popularity (being a 350 and all).

I'm planning on getting my motor used out of some fullsize silverado, but the vast variety of engines gm has put out over the past few years is making my v8 engine swap search daunting.

[chevytrucks92]

Originally Posted by Slowprocess

The 5.7L is lighter than the 5.3L. If I were going to do it, I would go ahead and get a 6.0L. Just about every part is interchangeable from the 5.7 and the 6.0L. The 5.7 is an aluminum block(hence the weight), but I just feel the 6.0L would hold up better in a heavier application, such as a truck. Just my

If the 5.7L is out of a 98-up F-body it might interchange with the 6.0L. But the only thing the same on the 2nd gen small blocks and the 3rd gen (what the 4.8/5.3/6.0 is excluding the 6.0 in the new Vette and GTO), is the rod caps, lol.

The 3rd gen. blocks are completely different from the 1st/2nd gen.

The bore and stroke for the 3rd gen engines are:

Displacement Bore Stroke Rod Length Block
4.8 3.779in 3.268in 6.275in Iron
5.3 3.779in 3.622in 6.275in Iron
5.7 3.898in 3.622in 6.098in Aluminum
6.0 4.000in 3.622in 6.098in Iron

The bore and stroke for 1st/2nd gen 5.7 are: 4.000in bore with a 3.480in stroke and I believe a 5.7in rod. I don't think the pistons would work from a 3rd gen 6.0 to a 1st/2nd gen 5.7 becuase of the longer rod used in the newer engines. Even the new 327s (which are really 325s) bore and stroke are totally different, lol. The old 327s (1st gen blocks) had a 4.000in bore and a 3.25in stroke. I dont really know what the stock rod length was though.

I think even the firing order is different on the new gen. blocks, and any 5.7L he finds from a GM truck will be a 1st/2nd gen design with an iron block and I think iron heads. I know my truck has the 1st gen block which is iron with iron heads, but 96-99 GM C/K series trucks have the 2nd gen. It may have aluminum heads, but I'm not sure.

Enough about that though, how is your truck coming along? Have you got to race anymore or has everything closed for the season?

[chevytrucks92]

Originally Posted by White Lightening

Greetings,

You posted:
"If I were getting a new 1/2-ton truck though, I'd go for the 5.3 simply for the extra 35 lbs-tq. I'm not sure how well the 4.8 would handle a trailer weighing around 3500 lbs. I know that's well within their limits, but in the real world, 3500 lbs will effect how a truck performs, especially in a hilly region. Actually, I think if I could get a new 1/2-ton truck, I'd go with the SS and get the LQ9 6.0 with its 345 hp and 380 lbs-tq. A truck like that would look good pulling a racecar! "

Below I posted the link to another thread where I described my new truck - a 2 wheel drive extended cab 1500 with the SS engine, SS transmission and limited appearance wheels, tires, and suspension. Its ALL stock - its 345 hp and I get 19.5 to 20.5 mpg. Lots of power for trailering and I'm almost 500 pounds lighter than an SS or 4x4 and $10,000 less than an SS too.

Didn't mean to intrude - just a thought.

http://www.automotiveforums.com/vbul...d.php?t=328799

White Lightening

Howdy. Well, that truck sounds like the perfect truck for the go-fast pick-up guys, but the reason I like the SS is becuase its AWD, lol. To me, a 2WD truck is useless, simply because of where I live (eastern KY). Now I'm not saying if I had an SS i'd be driving it in the salt covered snowy/icy roads in the winter, but it would be capable of some bad weather driving.

2WD fast trucks are very cool, and I would love to have one to mess around in, but for an everday all-weather driver (which is what I need/have), they wouldn't be practical.

Back on to the subject though, when I'm able to buy a new truck (Senior in college, one more semester to go), then it'll be a 3/4-ton HD Silverado/Sierra, possibly with the Duramax diesel, even though I don't paticularly care for diesels (which I have said a million times on here and to most everyone I know, lol. I could be calleda hypocrite if I ever have a diesel I suppose, lol).

Anyways, sounds like a cool truck you have, and congrats on the good MPG. You may or may not believe this, but my current truck (92 Silverado K1500, SWB, Regular cab, 4WD, 350, auto) gets 18.3-19.6 mpg with a mix of city and highway mileage. That's on 93 octane though along with 70 Series Flowmaster cat-back exhaust and Poweraid TB spacer, which DO make a difference in mileage.

[Knixon71]

Hey Chevytrucks, ya keep saying when you get out of school you're gonna have all this and that. That's what I thought, now here I am almost 4 years out of school making over 50k a year, and still can't afford crap (2000 GMC Z71 Ext cab 4x4 5.3). I spend most my money on my house and stereo first, though. House is cheap here in Montana, but other priorities kick in. Not trying to say that is everyone coming out of college, I am more just whining about not getting the air intake, programmer, exhaust, and other mods to push my pickup under 15 in the 1/4.

[chevytrucks92]

Originally Posted by Knixon71

Hey Chevytrucks, ya keep saying when you get out of school you're gonna have all this and that. That's what I thought, now here I am almost 4 years out of school making over 50k a year, and still can't afford crap (2000 GMC Z71 Ext cab 4x4 5.3). I spend most my money on my house and stereo first, though. House is cheap here in Montana, but other priorities kick in. Not trying to say that is everyone coming out of college, I am more just whining about not getting the air intake, programmer, exhaust, and other mods to push my pickup under 15 in the 1/4.

Lol, I'll probably be saying the same thing in 4 years, lol.

[Slowprocess]

Originally Posted by chevytrucks92

If the 5.7L is out of a 98-up F-body it might interchange with the 6.0L. But the only thing the same on the 2nd gen small blocks and the 3rd gen (what the 4.8/5.3/6.0 is excluding the 6.0 in the new Vette and GTO), is the rod caps, lol.

The 3rd gen. blocks are completely different from the 1st/2nd gen.

The bore and stroke for the 3rd gen engines are:

Displacement Bore Stroke Rod Length Block
4.8 3.779in 3.268in 6.275in Iron
5.3 3.779in 3.622in 6.275in Iron
5.7 3.898in 3.622in 6.098in Aluminum
6.0 4.000in 3.622in 6.098in Iron

The bore and stroke for 1st/2nd gen 5.7 are: 4.000in bore with a 3.480in stroke and I believe a 5.7in rod. I don't think the pistons would work from a 3rd gen 6.0 to a 1st/2nd gen 5.7 becuase of the longer rod used in the newer engines. Even the new 327s (which are really 325s) bore and stroke are totally different, lol. The old 327s (1st gen blocks) had a 4.000in bore and a 3.25in stroke. I dont really know what the stock rod length was though.

I think even the firing order is different on the new gen. blocks, and any 5.7L he finds from a GM truck will be a 1st/2nd gen design with an iron block and I think iron heads. I know my truck has the 1st gen block which is iron with iron heads, but 96-99 GM C/K series trucks have the 2nd gen. It may have aluminum heads, but I'm not sure.

Enough about that though, how is your truck coming along? Have you got to race anymore or has everything closed for the season?

I think there was just a misunderstanding on what 5.7L we were all talking about.lol
I thought he was refering to wanting a new 5.7L LS1 (346) 97up-vette, and 98 up TA/Camaro, and not the older 5.7L (350) found in the older trucks. Nothing will be interchangable from the older 5.7L to the newer LS-style engines, like you posted. I was refering to interchangability as being the LS1 5.7L to the newer LS-style motors in these trucks(4.8L,5.3L,6.0L). Most of my performance parts are for the LS1 5.7L, such as my cam and springs, as well as my transmission performance parts. Headers off of a LS1 will bolt up to our engines, but need to be heated and slightly bend to clear the frame differences from the truck and the car. I see a great number of LS1 guys these truck heads(5.3L), due to the increased flow over the stock LS1 heads. Our intakes also flow as well if not better than the LS1 intake manifolds(although I AM trying to get my hands on a new LS2 intake manifold. It's going to be some work modifiying it to work, but it is said that it flows better than the F.A.S.T LS6 intake that is so popular with these guys). My bud has a 2000 silverado with an LS1 5.7L in it, and he loves it due to weight reduction and the increased horsepower of the 5.7 over his old 5.3L. Well, I say 5.7L, but he actually punched it out to a 408. All of his accessories bolted on from his 5.3L, and he only had to modify one bracket to make it all work. He currently has the F.A.S.T intake system. He went 11.78 ALL MOTOR! So far, that is the fastest all motor new body style truck I have ever seen or heard of.

Anyway,my truck is still kicking hard down the track. I'm going to Greenville(local track)tonight to see if I can hook it in this cold weather, then I'm driving 5 hrs to Hattiesburg Sunday to race in a little high 50-low 60 degree weather to see if I can get in the low 12s. I ordered my underdrive pulleys, so they should be here soon. Should be good for another 2-3 tenths.