I am in the process of upgrading to the ls6 intake and am ordering the front coolant pipe and rear coolant plugs. The part #'s I got from ls1howto.com were: 12568478 for the front pipe, and 12562788 for the plugs. My gm parts guy stated the coolant pipe part # had changed, and it still lists the part as a coolant pipe, but he had a new part # for the rear coolant plugs as well, but he stated they were called "caps". anyone know if these are indeed what I need. thx again.
btw, the new part # he gave me for the "caps" is 12570678, and he said they were $4.64 each, sound right??

 

i just bought my ls6 intake and it came with the rear block off plates or caps. it also came with the front coolant pipe. the part #'s you listed are the part #'s on my parts sheet. your gm guy is right though, i don't know if they are called caps, but the block off plates do look alot like caps.

 

He is correct, that is the new part number. And yes that is what you need.

 

thx for the responses.