Engine weight? Long blocks. LS, SBC, BBC
02-26-2020, 05:27 PM
#1
Engine weight? Long blocks. LS, SBC, BBC Does anyone know what a long block LS weighs? Block, heads, cam full valve train covers on it (with or without intake don't really matter)
And also curious about old school small block chevy and big blocks. Kinda curious if a iron LS is much lighter than a SBC that also has aluminum heads.
And also curious about old school small block chevy and big blocks. Kinda curious if a iron LS is much lighter than a SBC that also has aluminum heads.
02-26-2020, 05:34 PM
#2
TECH Veteran
Well here is a start for you
02-26-2020, 05:37 PM
#3
Yeah i've seen that several times, and while I do appreciate any and all info. I just haven't seen long blocks/full dressed, discussed or weighed.
Also been thinking about performance gains for some of the old schoolers by going LS, not just in hp but in weight reduction and that got me wondering just how much of a weight difference there is.
Also been thinking about performance gains for some of the old schoolers by going LS, not just in hp but in weight reduction and that got me wondering just how much of a weight difference there is.
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02-27-2020, 10:54 AM
#7
Hell yeah, thank you. I dig the picture because it shows exactly what adds up to that 418. Wiring, coils plugs every single damn thing
And it's funny how it's 100% on the dot with what SLP posted, and it has an aftermarket intake and starter balancer etc. And still 418 on the dot
And it's funny how it's 100% on the dot with what SLP posted, and it has an aftermarket intake and starter balancer etc. And still 418 on the dot
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02-28-2020, 08:51 AM
#8
64post, picture really is worth a thousand words. A+ thanks for sharing
Small Block Chevey Dart SHP Iron Block with 4 inch bore is 175 pounds per Lukovich Racing Engine website. I was told by my engine build that my Dart SHP was 25 pounds more than my 72 Corvette's original 350 iron engine block. Typical GM SBC is 150 pounds or so. 180 for a "BowTie" block.
Small Block Chevey Dart SHP Iron Block with 4 inch bore is 175 pounds per Lukovich Racing Engine website. I was told by my engine build that my Dart SHP was 25 pounds more than my 72 Corvette's original 350 iron engine block. Typical GM SBC is 150 pounds or so. 180 for a "BowTie" block.
Last edited by 99 Black Bird T/A; 02-28-2020 at 10:18 AM.
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00pooterSS (03-03-2020)
03-03-2020, 05:42 PM
#9
64post, picture really is worth a thousand words. A+ thanks for sharing
Small Block Chevey Dart SHP Iron Block with 4 inch bore is 175 pounds per Lukovich Racing Engine website. I was told by my engine build that my Dart SHP was 25 pounds more than my 72 Corvette's original 350 iron engine block. Typical GM SBC is 150 pounds or so. 180 for a "BowTie" block.
Small Block Chevey Dart SHP Iron Block with 4 inch bore is 175 pounds per Lukovich Racing Engine website. I was told by my engine build that my Dart SHP was 25 pounds more than my 72 Corvette's original 350 iron engine block. Typical GM SBC is 150 pounds or so. 180 for a "BowTie" block.
Interesting. If I were going to assume, I would have assumed the LS iron block would not have been heavier than a SBC iron block, especially approx 70 pounds heavier. Thinking about it I guess it does have a bit more metal on it, but I just assumed with technology and being newer that somehow it would be more similar in weight.
It would also be based on knowing basically nothing since I don't handle either block often, as just a block or have them apart further than a block and rotating assembly still in them. Swapped plenty of both of them out, but the hoist holds all the weight lol.
A little over 20 years ago I carried a small block from the back of a truck about 20 feet to a work bench and put it down. It was heavy, but I've always tried to remember just how heavy. I only remember doing it. Cant even remember if it was a short block or long block, it was assembled but don't remember if it had heads on it. I'm gonna go with it was a short block lol.
Last edited by 00pooterSS; 03-03-2020 at 05:51 PM.
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03-03-2020, 10:31 PM
#12
TECH Fanatic
iTrader: (5)
You’re welcome. I’m really curious about the weight of these things. A 4L8Oe with converter using the same scale.....240 lbs, that might add some perspective. A 7.3 power stroke diesel (complete) with exhaust manifolds.....1010 lbs. Can’t beat an LS platform motor for weight vs cost vs. hp if that makes any sense.
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00pooterSS (03-04-2020)
03-04-2020, 12:10 AM
#13
00PooterSS, I read somewhere that the Gen III iron block was heavier than it had to be because GM decided to use the exact same dimensions as the aluminum block. GM decided not to spend extra resources refining the design for being cast in iron. They could have made the Gen III iron blocks lighter than they are if they had tweaked the design for an iron casting.
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00pooterSS (03-04-2020)
03-04-2020, 01:10 AM
#14
TECH Senior Member
Since all iron blocks go into trucks there is little reason to lighten them. When a lighter engine is desired, an aluminum one is used. No sense reinventing the wheel.
03-04-2020, 11:08 AM
#15
I do agree with that, it wasn't going to pull a lot of weight off and would cost a lot to do so, so cost vs benefit was low. But flip side of the coin they are putting aluminum on trucks for good reason and most have now moved to aluminum blocks as well, except HD trucks, those have already thrown out the lets save some weight options lol. But in a half ton, fuel mileage etc is important. Less weight helps a ton (pun intended)
Interesting thing (to me at least) I just realized my 2014 Sierra has an aluminum hood and that the 14 trucks are approx 300 pounds lighter than the previous gen trucks in the same trim. I like reducing weight where I can, as long as it makes sense, I've taken almost 200 pounds off my current truck.
Last edited by 00pooterSS; 03-04-2020 at 11:36 AM.
03-04-2020, 11:09 AM
#16
You’re welcome. I’m really curious about the weight of these things. A 4L8Oe with converter using the same scale.....240 lbs, that might add some perspective. A 7.3 power stroke diesel (complete) with exhaust manifolds.....1010 lbs. Can’t beat an LS platform motor for weight vs cost vs. hp if that makes any sense.
03-04-2020, 11:28 AM
#17
TECH Senior Member
I hear you, but at the same time they are putting aluminum on trucks for good reason and most have now moved to aluminum blocks as well, except HD trucks, those have already thrown out the lets save some weight options lol. But in a half ton, fuel mileage etc is important. Less weight helps a ton (pun intended)
03-04-2020, 11:48 AM
#18
I believe all Gen V engines are aluminum (might be wrong on this) plus all 6.2 engines are aluminum. So much of the move to aluminum truck engines is by default. Re-engineering iron blocks to lighten them would entail a big cost when, if a lighter engine is desired, drop an aluminum one in, which looks like what is happening.
On top of that they also chose to engineer an all new aluminum 4.3 V6 for the 14+. They had aluminum v6's, but they are 3.0 and 3.6. This is an all new engine for the trucks. There was a very purposeful move to aluminum.
Last edited by 00pooterSS; 03-04-2020 at 12:03 PM.
03-04-2020, 12:34 PM
#19
TECH Senior Member
Not really, default would be using all the gen 4 5.3's they had, just like they chose to do for the HD truck. They also already had aluminum 5.3's but chose to make a new one. The new (14+) HD uses a gen 4 6.0. If they were doing a default move they could stick 6.2's in everything, or like with the hd truck use a gen 4 motor, that would be default. But they chose to engineer an aluminum 5.3 that has different bore size, heads/valves, intakes, cam, even the exhaust system is different than the 6.2 and the previous gen 4 5.3, it's a bit surprising how many differences there are. With the 5.3 having so many differences so I wouldn't really call it a default move, it was engineered.
On top of that they also chose to engineer an all new aluminum 4.3 V6 for the 14+. They had aluminum v6's, but they are 3.0 and 3.6. This is an all new engine for the trucks. There was a very purposeful move to aluminum.
On top of that they also chose to engineer an all new aluminum 4.3 V6 for the 14+. They had aluminum v6's, but they are 3.0 and 3.6. This is an all new engine for the trucks. There was a very purposeful move to aluminum.