This is such a weird take. What other problems does an LS have? I have got to know.I agree 100%. There are some areas that are a small bit lacking on the old SBC, but almost everything about the LS is lacking, cylinder heads? Yeah port improvements etc. but what was given up for that? There is a reason for all the problems with the LS, and not just AFM.
The LS style should be called the mouse house motor, for good reason. Yeah maybe an okay deal for a race car but that under the intake space is nice for mice, in gramps grocery store vehicle.
GM Gen VI V-8 engine will be available in 2027
- Thread starter Snagglefoot
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Sequential multipoint fuel injection, the lack of a distributor, and a computer apparently.
4wd
$50 site donor 2026
Their just missing dad’s quadrajet 4 bbl carb …
OVERKILL
$100 Site Donor 2021
What are all the problems on the LS other than AFM/DFM (which can be removed) and the oil pump pick-up o-ring?I agree 100%. There are some areas that are a small bit lacking on the old SBC, but almost everything about the LS is lacking, cylinder heads? Yeah port improvements etc. but what was given up for that? There is a reason for all the problems with the LS, and not just AFM.
The LS style should be called the mouse house motor, for good reason. Yeah maybe an okay deal for a race car but that under the intake space is nice for mice, in gramps grocery store vehicle.
You can take a junkyard 5.3L and put a pair of hairdryers on it and make 1,000HP. You try that with an SBC and you'll be picking up pieces of block.
Nothing was "given up" for the LS, it's a 40 year newer design that aimed to rectify the deficiencies of the original G1 engines which were designed during a period where 150HP from a V8 was a huge deal.
OVERKILL
$100 Site Donor 2021
Oh yeah boyeeee! Get me an RV cam, some double-bumps fitted with the ram horns, an HV oil pump and an Edelbrock performer from Canadian Tire with a Quadrabog on it. Tune that HEI by ear and the sweet music of the Cherry Bomb blatt as the TH350 lethargically slurs all 180 of that horsepower into the porcelain diff as I get walked by a minivan.
To be honest, the 6.6 deserves a spot in the annals of muscle car history. In the mid 70's the Pontiac Trans Am could be had with a 6.6 (400 cu in.) decal prominently displayed on the backwards hood scoop. Back then hardly anyone knew what 6.6 liters was.
Naw, hoss. I want the 3/4 race cam.
Goll-leee! I’ll PUT A $100 bill on the dash EN I bet u can’t grab it heh-heh-heh. I used to HOP COKE cans at the bowling alley cruise nites… u can say she was PRETTY HOT.
OVERKILL
$100 Site Donor 2021
Yeah, they were a neat car, not very fast though. We had a guy with one locally, used to go to the local car meets back when people would still do impromptu drag races on the back roads. Beautiful example, in fantastic shape. Got baited into making a run against a Civic that was visiting from Oshawa, the car ran low 13's or high 12's (the Civic), can't remember which, but it was massively faster than the old T/A, which got its clock cleaned.
1977 Trans Am. 0 to 60 in 9.3 sec. Quarter mile in 16.9 sec.
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OVERKILL
$100 Site Donor 2021
Yeah, that sounds about right. A 2025 Honda Odyssey does 0-60 in 6.4 and does the 1/4 in 15-flat.
I too prefer the advantages of less power, less efficiency, heavier, weaker, leaky valve cover gaskets, mechanical timing and narrower power bands that SBC's provide over the LSx platform....
Wait, that doesn't make any sense... IMO if you put a carb on an LSx, it sounds pretty similar to a SBC. There is something to be said about the electrical simplicity of an engine that isn't computer controlled and the appearance of a SBC for certain classic cars. But the advantages overwhelmingly favor an LSx over an SBC.
I'll be curious what the new engines will be like, but I wonder just how much more they can squeeze out of OHV heads without a big cam. I sincerely hope they improve the AFM system and 10 speed transmissions. Oh, and the seats.
Wait, that doesn't make any sense... IMO if you put a carb on an LSx, it sounds pretty similar to a SBC. There is something to be said about the electrical simplicity of an engine that isn't computer controlled and the appearance of a SBC for certain classic cars. But the advantages overwhelmingly favor an LSx over an SBC.
I'll be curious what the new engines will be like, but I wonder just how much more they can squeeze out of OHV heads without a big cam. I sincerely hope they improve the AFM system and 10 speed transmissions. Oh, and the seats.
4wd
$50 site donor 2026
Nah, give me 3 2 barrel carbs that are super simple to sync on a 70lb cast iron lower intake manifold with points ignition that works flawlessly in all weather conditions....haha
Sarcasm aside. That is an incredible looking setup!! That would be fantastic in almost any vehicle and probably about 600hp based off the large pulley.
4wd
$50 site donor 2026
I asked him what it did in the 1/4 … he smiled and said “spin” …
LS engines have had their share of problems. None of which can be attributed to design. All the problems are centered around manufacturing flaws… oil pump O-rings, current debris left behind during machining (6.2), AFM system, poor quality materials in camshafts-lifters, and broken exhaust manifolds and fasteners. The 6.0 used in trucks and vans that had none of the AFM components were typically a high mileage reliable engine. More so than any of the old 305 & 350 small blocks built prior. Except for the last run of small block 350s (LT1) with Vortec heads and roller cams, SBC engines were long overdue for a replacement series.
70 lb, not even close to that and no lower intake manifold just the one. The forged steel crankshaft in an old 283 was 48 lbs.
No points go with the proven HEI, and a nice throttle body injection system. Don't need tons of power, just dependability and good gas mileage.
I'm pretty happy with our SBC. It makes 2 hp per cu in, in stock form.
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