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Old 12-09-2012, 10:07 AM
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ls1 vs sbc 350

Ok i know this topic has been beat to death and i know the ls engines are far more advanced but is all the work to fit a ls and wiring, plumbing, exc worth the benefits of the ls I would be using a t56 trans also so that means more work also is there any way i could get good drivable car out of my 80 z28 with a 350/4speed. A ls would be awesome though what all problems am I looking at if i bought a used ls1 complete with wiring and a t56 im doing a ground up restore and now would be the time to do the ls swap but im also ready to get this thing on the road and this would put me farther behind any opinions would be awesome

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Old 12-09-2012, 10:30 AM
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what makes the LS engine superior?better heads? fuel injection?

Guess what,better heads and fuel injection is available for gen 1 engines

now you have to choose,update an old engine with modern parts or buy a modern a modern engine that has modern parts? we still burn gasoline in the engines,pistons and valves are the same in both engines.

biggest problem is cost
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Old 12-09-2012, 10:53 AM
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hcompton

sounds like you actually agree with me.If we build ,as an example, a 500 HP LS or gen 1,then as long as the heads are both capable of correct flow and velocity with decent combustion chamber shape,both use a roller cam and fuel injection with correct A/F ratios and crank fired ignition to compare to modern LS ignition,,,,,

the performance should be the same or very very close?

what the real issues are:
can I make a gen 1 with a carb and flat tappet cam and distributor perform anything at all like a modern engine?
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Old 12-09-2012, 11:58 AM
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Quote:
Originally Posted by vinniekq2 View Post
what the real issues are:
can I make a gen 1 with a carb and flat tappet cam and distributor perform anything at all like a modern engine?
No you cannot.

And show me a stock 350 long block that can run around 1,000hp. There's a LOT of boosted 5.3L's doing that every weekend.

The heads are a big advantage as is the intake design, as is the electronics, but those are NOT the only advantages. Every aspect has been improved from the oil pump to the valve stem.
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Old 12-09-2012, 12:29 PM
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Originally Posted by ap72 View Post
No you cannot.

And show me a stock 350 long block that can run around 1,000hp. There's a LOT of boosted 5.3L's doing that every weekend.

The heads are a big advantage as is the intake design, as is the electronics, but those are NOT the only advantages. Every aspect has been improved from the oil pump to the valve stem.
oh boy, man, they did that crap to gen I's
boosted the .00001% difference in intake tracts aint making any difference..
the computer control is the only + for the ls family.
nothing you can't do to a gen I
most don't as the 5.3's are el cheapo at the moment, that will change with c.a.f.e. ratings on trucks
the love afair with hp in trucks is going to die a fast death real soon.. cause a 180hp engine uses tons less fuel than the 400+ ones in trucks now.. and are not needed with 6 gears other than a penis war bewteen manufactors and this is good, as it'll being the mini me duramax on line.. and bring 40mpg 1/2 tons to market.. killing the gas 5.3/6.0/6.2 it'll be v6 gas or mini me duramax, ford will be boosted v6 gas and their oil burner.,

Last edited by gearheadslife; 12-09-2012 at 12:36 PM.
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Old 12-09-2012, 12:59 PM
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Its hard for the Gen 1 engine to compete with the LS based engine, With there 12 degree intake valve, Large journal cam, high rocker ratio from the factory. Raise cam tunnel.

23 degree heads don't stand much of a chance!!

On the LS engines I have never cared for the Y-block design as that went out in the early 70's
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Old 12-09-2012, 04:54 PM
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Originally Posted by CNC BLOCKS NE View Post
Its hard for the Gen 1 engine to compete with the LS based engine, With there 12 degree intake valve, Large journal cam, high rocker ratio from the factory. Raise cam tunnel.

23 degree heads don't stand much of a chance!!

On the LS engines I have never cared for the Y-block design as that went out in the early 70's
worlds genI block that takes ls top end, kills both
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Old 12-09-2012, 04:56 PM
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Originally Posted by gearheadslife View Post
oh boy, man, they did that crap to gen I's
boosted the .00001% difference in intake tracts aint making any difference..
the computer control is the only + for the ls family.
nothing you can't do to a gen I
not even close.
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Old 12-09-2012, 05:15 PM
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Originally Posted by ap72 View Post
not even close.
ok..
the ls is an emission move..
boost a ls pops gaskets
the ls engine killed asa, and those where 200 miles runs.. and boom..
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Old 12-09-2012, 06:46 PM
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i guess i want mpg rather than hp maby 400 hp but i just want something i can drive. I have had a 2000 z28 and it was good power and mileage and i want that in my 80 z28 i can buy a complete ls1 motor and t56 trans for about 5k and im going to have about 3k in a rebuilt 350 the way i want it .It just seems the ls swap would be alot of work could i get decent mileage out of a 1st gen 350/4speed or is the ls swap not a bad as im thinking
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Old 12-09-2012, 07:17 PM
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If you only want about 400hp and good mileage do you care if it has less than 8 cylinders?

A boosted 6 cylinder can get you there too. Head work, a cam, blower pulley, and tuning on a supercharger 3800 backed by a T5 can be cobbled together pretty cheaply.

LS engines are great too, just a different idea.
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