[claust]

I am putting a zz3 that sat in the back of the shop in my son in laws 67 chevy two. The engine in fresh out of the crate and has not been run. What kind of break in procedure and oil would a person need to use?

[bigbadbowtie]

This is what has worked for me. Im not an engine builder but this is what I do with fresh engines. Im about to do the same next weekend.

The zz3 is a hydraulic roller engine so there is no real break in as there is with a flat tappet cam. I personally would run a HD diesel oil for the first few oil changes.

I would start it,set timing,check for leaks and drive it. I would change the oil after a few hundred miles and cut the filter open to check for any major debris. I would also run the diesel oil for the 1st couple of oil changes.
The diesel oil is again more for the flat tappet cams engines but will not hurt with a roller either. Molly has been taken almost completely out todays oils and that makes break in rough on flat tappets. Diesel oil still has it in at this point.

Good luck!!

[327NUT]

Ditto on what Big said, being a Powerstroke owner I,m a big fan of Shell Rotella T 10w/40 but they also make it in regular 30 wt. which is what I would use for break in purposes. Would.nt hurt to put a pint of GM E.O.S. (engine oil supplement) either. They also make it in a synthetic oil but NEVER use synthetic oil for break in...good luck.........Dave