My LS1 is all taken apart and mounted to my engine stand. I noticed there's some dirt and sludge in hard to reach places, i blew most of it out with compressed air. I also used brakes parts cleaner for most of the sludge i could see and that helped alot, i'm really trying to avoid hot tanking the block because it's not that bad. You guys have any tips from past experiences? How about the oil passages any ideas for that? Thanks.

 

pipe cleaners, for the small passages

 

oven cleaner easy off

 

Purple power and pressure washer.

 

Spray water inside the block?

 

That's how I cleaned mine. Then I dried and blew all the passages with compressed air.

 

I guess it's ok if you dry it right away, i'll give it a shot....Thanks.