New to LS1 engines, need help ID'n a couple hoses
 

Swapping into 1958 Apache Stepside pickup, I can id most - however one on the rear intake manifold - believe its a power brake vacuum?? taped end near my hand goes????
https://cimg8.ibsrv.net/gimg/ls1tech...b6ed103e49.jpg

Thanks - John

wish i could help you bud, 219 views and no body knows.

the big hose on the back of the mani nipple is for the brake booster

The other hose on the back of the manifold is used if the AC dampners are vacuum operated otherwise just block ot off