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6.0l Replacement Questions

thomasagarcia

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thomasagarcia New Member

thomasagarcia

Posted
Posted

I apologize if this topic has been covered already. I have a 2000 GMC Sierra 2500, 4WD, SLE, 6.0L V8, 300HP, 360 ft-lb Torque, with 4 speed automatic. I want to replace the tired block and heads with a new ZZ383, but retain the original Intake Manifold and electronics. My question is: Is this doable and what do I need to know to do it right? Will the ZZ383 heads match the stock Intake manifold? will the ZZ383 Heads match my stock exhaust manifold? Any insights on tuning or changes to stock electronics? What distributor should I use? etc. Thanks! :)

NitroCherokee Enthusiast

NitroCherokee

Posted
Posted
I apologize if this topic has been covered already. I have a 2000 GMC Sierra 2500, 4WD, SLE, 6.0L V8, 300HP, 360 ft-lb Torque, with 4 speed automatic. I want to replace the tired block and heads with a new ZZ383, but retain the original Intake Manifold and electronics. My question is: Is this doable and what do I need to know to do it right? Will the ZZ383 heads match the stock Intake manifold? will the ZZ383 Heads match my stock exhaust manifold? Any insights on tuning or changes to stock electronics? What distributor should I use? etc. Thanks! :)

 

If you are asking which distributer to use you're already over your head, stop now do not pass go, do not collect $200.00

tylerjenkins92@aol.com Senior Enthusiast

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Posted
Posted

Ummmm, are you talking about replacing your ls series gen 3 engine with a SBC gen 2 engine. NO!! It won't work. Not even close. Not without losing the electronic stuff anyway. 6.0l > zz383.

DwayneJ Enthusiast

DwayneJ

Posted
Posted

The zz383 is a gen 1 motor and a MASSIVE step backwards. Crate engines are rated with open headers and no accessories. Test a stock 6.0l setup the same but with performance reprogramming and I bet you are in the ballpark, put a cam in the 6.0l and you will blow the zz383 right out of the water.

 

If your engine is genuinely tired get a junkyard one, slap a cam(ZO6 maybe) in it and some reprogramming. Engines do NOT wear out like they used to though so it is fairly unlikely it is actually worn to the point of needing replacement.

Ported heads if you want more power. Put ported heads and a good aftermarket cam in a 6.0l and you can have more rear wheel HP than the zz383 makes at the flywheel.

 

 

The gen 1 is not going to fit, it could be done with different injection or a carb but either way would be a big step backwards.

DwayneJ Enthusiast

DwayneJ

Posted
Posted

If you really want to spend $5000+ on a crate engine look at the LSX376 Crate Engine PN19171049

 

450hp at 5900

444tq at 4600

 

The cam that comes in it is TINY, even a stock ZO6 cam is bigger. Lots of room for a cheap upgrade there.

 

Port those heads and put an aftermarket cam in and you can make a whole heck of a lot more power than that.

thomasagarcia New Member

thomasagarcia

Posted
  • Author
Posted

:) What is confusing to me is that the 2000 GMC Sierra 2500 spec sheet says that the engine is a Vortec 6L. It does not say it is an LS engine. In your opinion, is it an LS engine?

The zz383 is a gen 1 motor and a MASSIVE step backwards. Crate engines are rated with open headers and no accessories. Test a stock 6.0l setup the same but with performance reprogramming and I bet you are in the ballpark, put a cam in the 6.0l and you will blow the zz383 right out of the water.

 

If your engine is genuinely tired get a junkyard one, slap a cam(ZO6 maybe) in it and some reprogramming. Engines do NOT wear out like they used to though so it is fairly unlikely it is actually worn to the point of needing replacement.

Ported heads if you want more power. Put ported heads and a good aftermarket cam in a 6.0l and you can have more rear wheel HP than the zz383 makes at the flywheel.

 

 

The gen 1 is not going to fit, it could be done with different injection or a carb but either way would be a big step backwards.

thomasagarcia New Member

thomasagarcia

Posted
  • Author
Posted
The zz383 is a gen 1 motor and a MASSIVE step backwards. Crate engines are rated with open headers and no accessories. Test a stock 6.0l setup the same but with performance reprogramming and I bet you are in the ballpark, put a cam in the 6.0l and you will blow the zz383 right out of the water.

 

If your engine is genuinely tired get a junkyard one, slap a cam(ZO6 maybe) in it and some reprogramming. Engines do NOT wear out like they used to though so it is fairly unlikely it is actually worn to the point of needing replacement.

Ported heads if you want more power. Put ported heads and a good aftermarket cam in a 6.0l and you can have more rear wheel HP than the zz383 makes at the flywheel.

 

 

The gen 1 is not going to fit, it could be done with different injection or a carb but either way would be a big step backwards.

DwayneJ Enthusiast

DwayneJ

Posted
Posted

GM muddied the waters by calling the mid 90s gen 1 motors "vortec" when they upgraded the heads, and then reusing that term with the gen 3 LS based engines.

 

In the trucks the 4.8l, 5.3l, 6.0l and 6.2l are all LS based engines. The LS1 was available as a 5.7l in the Vette and f-bodies.

 

They do lots of confusing stuff like that, the "W" VIN engine code was used both for the 4.3l V6 and in the mid 90s also was used for a 4.3L V8 based on the LT1 used only in the Caprice sedan. That one even confused the dealerships.

DwayneJ Enthusiast

DwayneJ

Posted
Posted

The L99(4.3l V8) LT1 and LT4 are the only gen 2 engines, the trucks skipped right from gen 1 to gen 3 motors. The Vette got those from 92-96, the f-body from 93-97, the b,and d-bodies got them 94-96

 

The gen 2 stuff is a specialty of mine.

The gen 2 stuff is really very similar to the gen 1, biggest difference is the reverse flow cooling.

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