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ls1nova71 · 12-22-2013, 07:10 PM

I had never heard of that problem with the break in of a new engine either. How do they expect you to break it in with cast iron manifolds? I can't see anyone cutting their frame for the manifolds to fit and hooking up exhaust for them just to break in an engine, at least I'm not going to. The reason I was going to buy some was because I can't find manifolds that will fit without cutting things I don't want to cut.

I wonder if they were referring to flat tappet cam break in where you have to run the engine at a high RPM for a while? If that's the case, you should be fine since you didn't have to do that? Were you monitioring the A/F while driving? Was it running a little lean?

12-22-2013, 07:10 PM	#9
ls1nova71 Registered User Join Date: Dec 2009 Location: Independence Mo Posts: 4,119	Re: Doug Thorley header question I had never heard of that problem with the break in of a new engine either. How do they expect you to break it in with cast iron manifolds? I can't see anyone cutting their frame for the manifolds to fit and hooking up exhaust for them just to break in an engine, at least I'm not going to. The reason I was going to buy some was because I can't find manifolds that will fit without cutting things I don't want to cut. I wonder if they were referring to flat tappet cam break in where you have to run the engine at a high RPM for a while? If that's the case, you should be fine since you didn't have to do that? Were you monitioring the A/F while driving? Was it running a little lean? __________________ My '72 short bed build. http://www.ls1tech.com/forums/conver...6-0-4l80e.html 5.3 swap into my RUSTY '71 C10 http://ls1tech.com/forums/conversion...71-c-10-a.html Last edited by ls1nova71; 12-22-2013 at 07:16 PM.