LS6 intake VS LS3
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Joined: Feb 2007
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From: Battlecreek, MI / Mansfield, OH
I just completed the swap into a 69 chevelle. You will need LS2 intake, F body or corvette accessories if you are changing them, F body or corvette water pump and you can use the truck TB if you want to. I bought a complete intake, rails, injectors, and TB for 400. I believe you can use the truck water pump if you use the truck TB and you can use the truck accessories if you relocate the idler pulley for the PS pump. The stock wiring harness is funky if you use it due to it going over the top of the tall truck intake. I completely reworked mine standalone and tucked it all. Also the EGR is slightly different as you cap the hole in the drivers side valve cover and use the line coming out of the valley cover instead which is plugged from the factory on the trucks. The PCV system is under the valley cover so you dont need a PCV valve either. You use the pipe on the passenger side valve cover for filtered fresh air inlet.
. 12 hour nights fryin my brain. 
The reason people are replacing the ls2 intake to the ls3 is because they are also using ls3 heads because the ls2 has a large enough bore to run them. The ls2 intake sucks and the ls6 flows better.
