differences in cali and federal lb7

[zf>allison]

Looking to buy an engine to throw in my truck for the time being, so I can build the messed up one that's in my truck on the side. Turnes out its a cali emissions engine with crap everywhere. Vacuum pump all kinds of plugs and crap, Jankey emissions y bridge. But i thought I read somewhere the cali heads were different which would turn me off of this engine. Is there anything else that's different from my 01? And what's the chances of selling the emissions junk?

 

[duramaxzak]

Cali heads, y-bridge, turbo rear bolt pattern, glow plug controller are all different. Also has a EGR and air pump.

Wire harness on the motor is different also.

The Cali parts really have no value, unless you find someone with one that need's some thing.

 

[zf>allison]

Cali heads, y-bridge, turbo rear bolt pattern, glow plug controller are all different. Also has a EGR and air pump.

I noticed the glow plug controller, bridge, and vacuum pump. And the pcv wasn't rerouted it went to the pump. What exactly is different about the heads? Not worth using?

 

[duramaxzak]

Says Cali heads flow 30cfm less than federal.

http://www.dieselpowermag.com/tech/chevy/0704dp_socal_diesel_duramx/photo_04.html

 

[zf>allison]

Nice and useless lol

 

[zf>allison]

Guess I'm leaning back towards a mild build lol

 

[catman3126]

Yeah big difference in heads. I had a set and finally hauled them to the scrap yard. couldn't give them away.

 

[zf>allison]

That's so stupid lol why not just make them the same? Lol seems stupid to have them different like that

 

[Awenta]

Cali is stupid

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[onebaddmaxxx]

Yup, had a cali lb7. I changed out everything but the heads. The turbos even sound really weird with aftermarket exhaust

 

[zf>allison]

Yup, had a cali lb7. I changed out everything but the heads. The turbos even sound really weird with aftermarket exhaust

Stock turbo or after market sounded weird?

 

[duratothemax]

That's so stupid lol why not just make them the same? Lol seems stupid to have them different like that

Because the original LB7 heads were designed for use with no emissions controls (EGR) and did not take EGR into account when they were designed. When the EGR and cat had to be added to meet the new california emissions regulations, obviously GM found that the existing/original LB7 head wasnt compatible with EGR and/or didnt work properly to decrease emissions.

And so they had to change it. LLY+ was designed from the start for EGR and emissions controls, and the head was completely redesigned, so GM was able to change things enough to the point of where it could accomodate EGR/PCV/emissions, and flow much better than the last-minute-botched/hacked/modified low-flow LB7 cali heads...

As far as I know, cali LB7 heads still flow more than a 12-valve cummins head though.