currently i have a 350 sbc in my regal. i want something more powerful and was leaning towards a 383, but the more ive seen them on here the more interested ive gotten in the lsx swaps(5.3 and 6.0). it seems that you can get good power ( i was shooting for 400-425 hp) and probably better gas mileage than a 383. how do the two compare, hp mpg and cost wise? how difficult is the swap? any info is appreciated
383 vs Lsx
- Thread starter slik25
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My swap was easy... if you already have an SBC your halfway there because u have the mounts you need.. all you need is the conversion plates that are 1 inch set back, they allow you to use your sbc mounts bolting them to the LS block...
You need the $45 Hughes crank spacer, which you easily hammer in the crank (if your using a curved flywheel)
You open up the flexplate converter holes and voila bolts right in!!
F-body manifolds fit nicely or Pacesetter F-body headers work too with some beating on the passenger side other than that its minor bullshit.. I used the stock 105 amp delphi alternator, it plugged right in charges like a pro as well as the truck ps pump.. (use a pressure hose from a 307 tho)
I have probably 1500 invested in my motor swap... and my setup should put down 300-330 RWHP... try that with a 383.. by the time your all said and done youll be close to 3000
You need the $45 Hughes crank spacer, which you easily hammer in the crank (if your using a curved flywheel)
You open up the flexplate converter holes and voila bolts right in!!
F-body manifolds fit nicely or Pacesetter F-body headers work too with some beating on the passenger side other than that its minor bullshit.. I used the stock 105 amp delphi alternator, it plugged right in charges like a pro as well as the truck ps pump.. (use a pressure hose from a 307 tho)
I have probably 1500 invested in my motor swap... and my setup should put down 300-330 RWHP... try that with a 383.. by the time your all said and done youll be close to 3000
Beeter is being modest - he's probably got 400 horse.
A junkyard LQ9 will out-perform a brand new stroker 383. These are amazing engines! Carburetor makes it easy peasy.
A junkyard LQ9 will out-perform a brand new stroker 383. These are amazing engines! Carburetor makes it easy peasy.
Mmmm.. I'd much rather have an LS. For fuel economy, longevity, & cool factor. That said saying a JY LQ9 (if you can find one & needed stuff half way reasonably) will outperform a new 383 depends on the heads, cam, & build of that 383. There have been many very righteous pumpgas n streetable 383s built.
LS
car-part.com - find your engine there.
Do a little research:
The truck "LS" engines are cast iron. There are lots of 4.8 5.3 and 6.0 liters. As for price anywhere from $200 up to $2000 generally the larger displacement the higher the price. If you want all-aluminum you'll pay more most of them are 5.7 and are from Vettes, F bodies, and GTOs.
As for mileage, the fuel injection engines seem to last a little longer than stuff used to. 80-100k? the one I have is unknown mileage (it was totalled)
car-part.com - find your engine there.
Do a little research:
The truck "LS" engines are cast iron. There are lots of 4.8 5.3 and 6.0 liters. As for price anywhere from $200 up to $2000 generally the larger displacement the higher the price. If you want all-aluminum you'll pay more most of them are 5.7 and are from Vettes, F bodies, and GTOs.
As for mileage, the fuel injection engines seem to last a little longer than stuff used to. 80-100k? the one I have is unknown mileage (it was totalled)
while the 5.3l is a great replacement for the 305, and if you get one really cheap it's worth it. but since you want 400+ you really want to get a 5.7 or larger
there is ABSOLUTELY no reason to get rid of the existing EFI/ignition system on the LS. it will support plenty of power, good MPG, and rarely breaks. it's also one of the best systems out there.
actually, it's pretty stupid to go backwards with a carb--the efi retunes for environmental conditions many times per secon--this means you have all the power all the time, unlike a carb that has one tune only.
there is ABSOLUTELY no reason to get rid of the existing EFI/ignition system on the LS. it will support plenty of power, good MPG, and rarely breaks. it's also one of the best systems out there.
actually, it's pretty stupid to go backwards with a carb--the efi retunes for environmental conditions many times per secon--this means you have all the power all the time, unlike a carb that has one tune only.
megaladon6 said:
Wow, carb swappers are stupid? At least we use capital letters and proper punctuation.
The carb setup offers simplicity of install and a cost/benefit ratio that far exceeds EFI. The Escalade engine I used had drive-by-wire which meant I would have needed an electronic gas pedal, it also had a sophisticated VATS system that is not easily to circumvent. EFI also requires a different fuel system (pickup, tank, pump etc.).
Here bud I made a video to break down the installation...
http://www.youtube.com/watch?v=RLaRLiqmDW0
http://www.youtube.com/watch?v=RLaRLiqmDW0
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