Need help with identifying a part on the back of cylinder heads.

[theJime]

I am finally putting my 6.2 back together. I seemed to have lost two plugs(not sure how to describe). They are on the back of both cylinder heads like a coolant crossover but it doesnt cross over. I have a picture with the two parts circled. This picture is not from a 6.2 but its the parts I am missing. If someone knows the part numbers or what the part is called, that would be great. Thank you for any help given.

 

[j91z28d1]

Google ls steam port block off

or you can buy the kit to connect them all. I. honestly never went done the ribbit hole of when to run them and when to block them off.

 

[theJime]

Perfect. Thank you.

 

[Doubeleive]

Perfect. Thank you.

those are the rear steam crossover block-off's dorman makes a replacement, last time I check gm stopped making them.

 

[donjetman]

I am finally putting my 6.2 back together. I seemed to have lost two plugs(not sure how to describe). They are on the back of both cylinder heads like a coolant crossover but it doesnt cross over. I have a picture with the two parts circled. This picture is not from a 6.2 but its the parts I am missing. If someone knows the part numbers or what the part is called, that would be great. Thank you for any help given.

https://www.summitracing.com/parts/ear-ls0041erl

 

[Foggy]

Just block em off like GM did on our rigs
I did go down the rabbit hole as I did the 4 corner on my C5 Vette
Our trucks have a better "angle" for the engine vs the pass cars so it's
not really "needed" ... Of course the 4 corner is better, but not necessary like
it is in the cars LS engines

 

[89Suburban]

I would replace the seals on them while you have access.