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LY6 or LQ9 or LS2?

 
Old 09-24-2018, 07:33 AM
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LY6 is actually 9.6:1
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Old 12-31-2018, 02:57 PM
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I'd go ly6 (If its not much more $) as its 9.67:1 and has the l92 heads.
Ly6 has the gen 4 rods and they are stronger than the gen 3 stuff
crank on them all is good for a fair bit of power
Pistons if replaced could pickup so compression ration if you want but may be fine stock depending on the power you want.

I highly advise a cam to match you vehicle and power goals.

Are you sure a ls is going to make you happy? The grunt/torque of a big block is addictive... Not saying the LS won't haul hard... It can.. depending on your combo... but the 496 will give you more torque.. Its an apples to oranges comparison.. LS going to spin more RPM than the 496 (depending on what you build).. and take a little more rpm to get going.. so a good stall will help... hit the tires hard and get going when you kick it down. the Ls should help you shed a little weight off the front tires so that could be a good things depending on how your suspension is setup but could mean different or cutting front springs to get the ride height you want.

B
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Old 01-01-2019, 05:57 AM
  #23  
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Don't fall into this Ls hype. Its going to cost you a bunch of money and boy are you going to be disappointed after changing from the big block. You already have the best there is. If any of us had any brains we would all have big blocks. It sounds like if you just went with a mileage cam on the big block You would still be making killer power and cost you way less. You will have to do something to the LS to even come close to the big block power and then there goes your gas mileage. At the end of the day you will spend a **** load of money to accomplish absolutely nothing. Hey, but you will have the All mighty Ls. Lol. There are a lot of SBC motors out there kicking the **** out of Ls motors too.
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Old 01-01-2019, 11:58 AM
  #24  
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No, we would NOT all have big blocks. They are VERY big, VERY torquey, and VERY thirsty. Only good for racing, or towing for those who can't handle diesel engines. Only a very-well built BB will outdo a good LS. It's not hype. The LS is a far better engine than either the SB or BB. Consider yourself in denial....
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Old 01-01-2019, 01:42 PM
  #25  
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Never owned a BB, but had a number of built SB's....I can say LS is way better than SB.

Over 40ci smaller, way less cam, way more tamer/street-able and going faster.....Yes, I'm happy with my choice.
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Old 01-01-2019, 02:02 PM
  #26  
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There’s no hype. There’s a lot of advantages of the LS. I would never build a gen1 unless I was going a restoration. You’ll never dollar for dollar make the horsepower that a LS does. What regular small block Chevy can make over 500 hp with just a cam change. Also as far a BBCs go. I have a few of them. You can make good horsepower with them but, you will need more money than the LS. I have a 440bbc with a 8-71 blower on it that makes a 1000hp and I get maybe 3 mpg. I needed aftermarket rods, ported heads, and lots more. Now I have a LY6 that makes more power than that with just a cam and turbo. I can drive anywhere and get pretty good gas mileage also.
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Old 01-01-2019, 02:03 PM
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Not to mention the heft factor
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Old 01-02-2019, 04:01 AM
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When you guys say the LS is (WAY BETTER). In what way exactly?
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Old 01-02-2019, 05:01 AM
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Lighter, 15 degree heads, 6 bolt mains. GEN IV are really beefy. Easy to work on.
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Old 01-02-2019, 07:55 AM
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Originally Posted by dmracing View Post
Lighter,
(25lbs on the iron and 100 on the aluminum)
15 degree heads
(This is the only thing that's better stock)
, 6 bolt mains
(Hemi motors are only 2 bolt they work fine)
My son has a 69 327 in his mud truck that is 2 bolt main. Motor makes 450 at the flywheel and has a 150 shot of nitrous on it. It runs on pump regular and pulls 18 inches of vacuum. Nitrous runs on the same regular gas. There are times in a bog where you may spray the whole bottle before you get out of the pit. Have never even nipped a plug. Motor is completely stock with iron camel hump heads stock cast crank and rods. It has a flat tappet cam and gets spun to 7000rpm constantly. It has had over 50 bottles through it with no problems over the years. Only thing done was a cam, lifters, springs, a decent set of $60 push rods and a cheap set of crane roller rockers. $160.00 It is held together with stock bolts not studs. He did upgrade the rod bolts.
. GEN IV are really beefy
(In what way)
. Easy to work on.
( Not even close)
You have to pull the heads to change lifters, you have to pull the whole front of the motor to change the oil pump. You have to take the coils off if you need to pull a valve cover. Not to mention the oil pumps are a bad design and cavitate easy.
If you need to retorque your heads you have to pull the shaft rockers out to do it.
So I'm not really following you here.
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Old 01-02-2019, 08:15 AM
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You can get 650Hp out of a basicly stock big block with a cam change with NO power adders on pump gas. Tell me you can do that with a basicly stock LS.

Remember. The Op already has a running motor. Are you guys seriously going to tell this member these Ls motors have some sort of fairy dust on them to make them better. Who is in denial.

Keep your big block. Change the cam to get better gas mileage. You will be very happy in the end that you did. That is unless you have a lot of money laying around you just must spend. Then by all means. But don't expect very much other than maybe a little better gas mileage. And that's maybe.
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Old 01-02-2019, 12:43 PM
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Not going to make 650 hp on pump gas in a big block with a cam change. I’ve been building engines for over twenty years.
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Old 01-02-2019, 01:12 PM
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You do know your camel humped small block make less power then a stock LS, right.
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Old 01-02-2019, 06:26 PM
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Originally Posted by TTur1996 View Post
You can get 650Hp out of a basicly stock big block with a cam change with NO power adders on pump gas. Tell me you can do that with a basicly stock LS.

Remember. The Op already has a running motor. Are you guys seriously going to tell this member these Ls motors have some sort of fairy dust on them to make them better. Who is in denial.
https://ls1tech.com/forums/carburete...gine-dyno.html
648H/526T
6.0L, LS3 heads (AKA: LY6) Cam swap, fly-cut pistons, and shaved heads....yes....yes, it can be done

Last edited by Doug G; 01-02-2019 at 07:21 PM.
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Old 01-02-2019, 07:38 PM
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Originally Posted by Doug G View Post
https://ls1tech.com/forums/carburete...gine-dyno.html
648H/526T
6.0L, LS3 heads (AKA: LY6) Cam swap, fly-cut pistons, and shaved heads....yes....yes, it can be done
Sure didn't last very long. The man was very truthfull. Most stock built Is motors don't seem to last very long.
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Old 01-02-2019, 07:48 PM
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As he said, could have been corrected, but went another route.
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Old 01-02-2019, 08:46 PM
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I’ve been running the same 2008 6 liter with 20 plus pounds of boost for two years. Over 1000whp. All I did was change cam,pushrods, springs, trunnions, oil pan, intake and throttle body. I even used the stock exhaust manifolds. I also have a 2008 6.0 short block stock with a cam change, springs, pushrods, 799 heads(ported). Super victor and a 950hp carb. Ran it all summer. Runs low nines, high 8 on the spray. Tons of bottles put through that thing.



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Old 01-02-2019, 09:23 PM
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There is a reason why Chevy replaced the big block with the 6.2
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Old 01-03-2019, 05:02 AM
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You build one of your stocker LS motors to 700 Hp, drop it in a modified dirt car and let's see how long it lasts. The tried and true SBC still rules.

Listen fellas I agree the LS motor is a very good motor in its stock configuration. The OP already has a running motor in his car. With most people being buget minded. It makes no sense to change all that to Ls. And there is a lot of different parts that will be needed. You guys are making it seem like it will be the greatest thing next to sliced bread and its going to cost him a crap load of money to do it. I was just trying to be honest with him. I go to the track regularly. I have seen many guys build stocker Ls motors with turbos. The one thing that most had in common was boom the track is oiled down.

Build a Is with good parts so 700Hp will last like a built SBC. And the cost difference is pretty substancial. At the end of the day 700Hp is 700Hp. No matter what your running.

We currently run a Dart LS next 427 block with 1/2" head studs, Callies Dragon slayer 4" crank, ultra hbeam rods, and the best diamond race pistons for nitrous. It has AFR heads with T&D shaft rockers with Trend push rods. We went with .904 custom lifters. We run the CID intake with a custom built Pro Systems 1100 Dominator. The motor puts out over 700Hp and well over 600ft pnds of torque N/A but has a pretty big nitrous cam in it. And it does all that by 6800 rpm. Nitrous Solutions set us up with tune ups up to 500 Hp.

So you can see I'm no stranger to the LS world. When you build one like that you gain longevity big time. It just cost more to do it with the same parts.

I'm done with this thread. It was just a suggestion any way. I still say Hype.
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Old 01-07-2019, 11:59 PM
  #40  
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A stock big block run if the mill is trash and won’t make shut for power for the cubes. Fact.
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