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65GS
11-27-2005, 05:15 PM
I have a freshly rebuilt 401 Nailhead that I plan on running a commander 950 TBI system on, would it be wise to start and do the initial break in of the engine with a carb????

andrewb70
11-27-2005, 07:06 PM
Short answer:
Yes.

Andrew

Fuelie Fan
11-30-2005, 02:13 PM
long answer:
yes

EFI69Cam
12-01-2005, 06:42 AM
Are you talking about a brand new engine in general or a brand new engine with an uncalibrated ECM?

I have been careful of this issue as I have heard the rich mixtures from efi systems can wash the rings out. I usually use a plagarized calibration from a similar engine as a start point.

I am concerned about this now as I will be firing up my 540 soon, and I have to depend on Accel's calibration builder to get me started. Will Calmap get me close enough to fire the engine safely?

ty1295
12-01-2005, 06:50 AM
If you have an experienced efi tuner or are one, and are careful not a big deal IMO.

If you have never tuned FI, then starting on fresh motor probably isn't good idea.

65GS
12-01-2005, 06:49 PM
Thanks for the responses guys, i have NO experience with efi, and kind of figured it would be better to break in a fresh engine with the original carb,, just kind of fishin for idea's and other thoughts!!!! Thanks