Originally Posted by smoked240

I added arps to my Rb25 and didn't have a line hone done. Engines have been built for decades without being line honed and have no issues.

I believe it depends on what engine/ hp goals and what you're doing with the engine, also why was it rebuilt? Did it spin a main bearing? If so a mainline hone would be smart to do. RB engines have a giant one piece maincap gurdle. Now if it was like a Small block Chevy with individual main caps, a line hone wouldn't be a bad idea. I've built a few Chevy 350s without mainline honing and they're still going to this day.

I'm not telling you DONT main line hone your engine, I'm simply informing you of my experience with it.

If I was going to build my RB for 800-1000hp all day and gonna be slamming it off the revs then yes, a mainline hone would have been in the build.
Just my .02 cents.