Joined: Nov 2011

Posts: 52

Likes: 0

From: VA

Joined: Mar 2005

Posts: 8,859

Likes: 323

From: Conroe, TX

In my experience no, it’s not necessary. Plenty of people will argue that it should be done though.

Joined: Mar 2008

Posts: 4,920

Likes: 531

From: Dallas

Joined: Mar 2006

Posts: 577

Likes: 8

Joined: Aug 2009

Posts: 1,841

Likes: 252

From: Coast of San Mateo County Between Pacifica & HMB

The Benefit of Break in Oil is 99% for NEW Piston Rings & Freshly Honed/Finished Cylinder Bores.

and flat rappet cams which are Not Applicable in LS Engines

Joined: Jan 2012

Posts: 7,804

Likes: 5,135

From: Dawsonville Ga.

Personally I’d run it for the new hone/ring relief. Necessary? Debatable. A new hone brings some dirt and debris, no matter how carefully you wash and scrub the cylinders, due to ring friction as the rings take a seat.
Id dump it after a few short runs to get the junk out of my crankcase.