Kenworth 3406 cat motor blowing gaskets

850 Hp is not what is blowing the head gaskets. I've worked my truck for years in excess of 1050 Hp or higher to the tires without a single head gasket failure

 

You say you have stock injectors with an 850 Hp tune in the ECM.

Can you be a little more specific about the parts and tune.

Engine serial number? This will tell me what stock injectors you have.

All marine/industrial/truck engines use different injector to achieve most of the Hp, so using a 850 Hp file in the ECM will not give you an 850 Hp engine without the correct parts in the engine

I need information to give you ideas of what is possibly wrong

 

Just my 2cs dont settle for the its within specs line from cat tell them you want the liner protusion at 5 tho and if they dont take to different shop get it set right. Been down the within specs route cost me money not the loser wrench working on it. Then follow Mr. Haney advice.

 

Do you really think Couture and Coga engines are daily drivers?

 

Yeah, probly just take off the boost wire to cut down on smoke for daily usage

 

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What shop was this that did the ecm for you? Only way he could get 850hp out of your truck with it being stock like that would be modified files in the ecm. That's not little league stuff... there's only like 3 or 4 companies out there maybe less that can modify Cat ecm files.

What turbo was put on to support 850hp? Did your egts get hot easily? How do you know its 850hp?