383 vs Lsx

[JRG53]

Just my two cents and I've shared this before!

LS motors were made, tuned, everything for EFI, not carbs! Why mess with something that makes huge power, gets great gas, and has tons of online support?

If you want to go carb, get a Gen 1 SBC!!!

 

[beeterolds]

Just my two cents and I've shared this before!

LS motors were made, tuned, everything for EFI, not carbs! Why mess with something that makes huge power, gets great gas, and has tons of online support?

If you want to go carb, get a Gen 1 SBC!!!

Because when it comes down to it.. its cheaper to change jets and toy with the carb on a dyno instead of spending countless hrs programming it...

Mine runs perfect.. fires up like it has injection... theres guys making killer numbers with carb setups on the cheap.. numbers SBC guys can't touch without serious aftermarket heads and a cam.. Look at Jays LQ9 Regal.. 12.3s with a carb on top.. stock motor.. try that with a STOCK SBC even the best early motors can't touch these times.. .. not happening.. Its all a matter of preference.. why hate?? Don't knock it till you try it.. Carb setups can be had for a decent price if you do proper shopping.. As I mentioned eventually im going back to EFI but until then Im pretty damn happy with how this motor runs

 

[79loserbluebu]

406rwhp 376rwtq on my stock bottom end LQ4 with 64cc heads. Engine parts aren't cheap for these engines but they sure are a blast to drive

 

[Clone TIE Pilot]

A big problem with changing a LSX to carb is it is illegal for a Gbody. Down in Fl, there is near 0 enforcement of emission laws so people down there can get away with all sorts of illegal mods. However in stricter states with inspections like CA and NJ, they will fail your car for having a carbed LSX because it disables the LSX's emission systems.

As for 383 vs LSX, you have to remember that GM can build motors much better than most home gearheads, aftermarket machine shops, and aftermarket builders ever can. Now a true expert engine builder could build a 383 that would beat most LSX's, but such experts are hard to find outside of factory R&D or pure racing. There are so many fine details that can make or break an engine build and most of the aftermarket ignores these fine details to reduce costs and increase profits.

The only cons I know about LSX engines are the cost of the engines, cost of parts for them, cost of parts needed to retrofit them into cars never designed for them, and cost of the support systems such as EFI, cooling, emissions, exhaust, etc. I have also read about that LS engines have very poor PCV systems that are prone to clogging which causes idle problems. The fix is supposed to be the use of a catch can.

 

[JRG53]

Alls I'm saying is, you can get an LS motor ready to go, so why tear into it just to put a carb on it? I'm not hating, and I'm sure you can make a ton of power either way (power = $$$). It just makes sense to me to run these motors they way they came from the factory. They already make big power without any mods. Just saying. Wanna go through the trouble of changing it over, be my guest.

 

[motorholmes]

All I'm saying is, do whatever the hell you want, and have fun doing it. We'll all enjoy watching your build thread either way

 

[mkube396]

A big problem with changing a LSX to carb is it is illegal for a Gbody. Down in Fl, there is near 0 enforcement of emission laws so people down there can get away with all sorts of illegal mods. However in stricter states with inspections like CA and NJ, they will fail your car for having a carbed LSX because it disables the LSX's emission systems.

so what your saying is if i have a 1982 G-body and i put a LSx engine from 2005 there going to test it for the 2005 standers? that makes no seance.....
From what i was told from people in CA is they look for all the 1982 emission cats's and so on then stick a tester up the tail pipe to see if you meet the regulations for 1982

 

[85GPLef41]

A big problem with changing a LSX to carb is it is illegal for a Gbody. Down in Fl, there is near 0 enforcement of emission laws so people down there can get away with all sorts of illegal mods. However in stricter states with inspections like CA and NJ, they will fail your car for having a carbed LSX because it disables the LSX's emission systems.

so what your saying is if i have a 1982 G-body and i put a LSx engine from 2005 there going to test it for the 2005 standers? that makes no seance.....
From what i was told from people in CA is they look for all the 1982 emission cats's and so on then stick a tester up the tail pipe to see if you meet the regulations for 1982

you were told wrong.... As for MOST states they do not strictly enforce the rules, CA is the biggest stickler for these regulations. When i called the state emissions office i was told that whatever came off of the "donor" would have to be present, SO if it came with evap, o2, cats, ecm, air pump etc etc it would have to be in the vehicle.. I'm sure there is some ways around it ie tuning out rear o2's, evap, etc etc This has been discussed multiple times over and over again. :| Like i said before it would be sweet to just add a carb and a MSD ignition system and all these "minor" inconveniences would be avoided.

 

[Clone TIE Pilot]

A big problem with changing a LSX to carb is it is illegal for a Gbody. Down in Fl, there is near 0 enforcement of emission laws so people down there can get away with all sorts of illegal mods. However in stricter states with inspections like CA and NJ, they will fail your car for having a carbed LSX because it disables the LSX's emission systems.

so what your saying is if i have a 1982 G-body and i put a LSx engine from 2005 there going to test it for the 2005 standers? that makes no seance.....
From what i was told from people in CA is they look for all the 1982 emission cats's and so on then stick a tester up the tail pipe to see if you meet the regulations for 1982

you were told wrong.... As for MOST states they do not strictly enforce the rules, CA is the biggest stickler for these regulations. When i called the state emissions office i was told that whatever came off of the "donor" would have to be present, SO if it came with evap, o2, cats, ecm, air pump etc etc it would have to be in the vehicle.. I'm sure there is some ways around it ie tuning out rear o2's, evap, etc etc This has been discussed multiple times over and over again. :| Like i said before it would be sweet to just add a carb and a MSD ignition system and all these "minor" inconveniences would be avoided.

Yep, the basic rules for legal engine swapping are, the engine can't be older than the car, can't be from a truck into a car or vise versa, and the motor must have all of it's emisson systems intact and working. It's why they offer the LS3 E-Rod crate motor, comes with a complete emission systems for a legal swap for most older cars. As far as I know there are no carb LSX kits that retain the emission system and have either CARB EO or EPA numbers to make them legal. You should also look into your local level of enforcement before deciding which to choose. It's not just states, but counties can have different levels of emission enforcement.

Even though I am a carb guy, if I went to LSX I would go with EFI, I am not fond of aftermarket carburetors like Eddies and Holley, just my two cents.

 

[beeterolds]

My state mandates echeck for vehicles less than 25 yrs old..even when I needed testing I ran the converter obviously cause its required...but unless I was applying for an exemption waiver they neverpopped the hood.. Run what you can whatever you like.. my issue is ignorant *ss people who have problems with onespreference... run a Carb fine..injection?? Fine... just don't knock it
..remember GM themselves came out with a carbed manifold around the same time edelbrock made theirs...so their engineers even saw some progress with old tech