[SierraMtns]

Originally Posted by BarnfindC10

We were able to get 2011 5.3/6l80 installed today(planned to do new lt1 but after doin some research didn't want any headaches)Porterbuilt must of made the ls1 mounts for car intakes and 4l60's. The motor mounts have to bee shortened 2in to clear intake to cowl. Blower goin on tomorrow. The 6l80 is a lot bigger then the 60's I usually install. Looks like a high hump tunnel will cover most of the opening.

Man that looks like a big tranny. Whats the reason for going with a 80?