Now, this is not directly slant 6 related but it IS Mopar related so... please cut me some slack.

I have rebuilt a 318 to put in my 1966 Clark RV. I will have a break-in period that I am not sure will be very easy to manage in a small bus sized 9000 pound RV. I will do the cam break-in stuff then I have to seat the rings and drive the beast 500 miles...
I also live in the middle of Hollywood. Small streets and kind-of a distance from any freeway that has no traffic to seat the rings and do all that stuff.
I thought that I could have a few weeks of "after midnight driving" while there is no traffic to do this stuff ... OR ... I had another idea...

What if I took my rebuilt motor and put it in my 65 D100 for the break-in. It is much smaller and lighter than my RV, I already have the bell-housing that has the multiple bolt pattern to accept it, I already have an HEI set-up in my truck and my slant six said it wouldn't mind...

Would there be any reason to not do this? I have heard conflicting theories about motors being broken-in in the vehicle they are meant for and others saying that it is a great idea. ??

I highly value the knowledge of the people on this board which is why I am asking. Thanks for anyone who might help me on this decision.

Frankly it is more of a space issue than anything else. Breaking-in a motor on my truck is much easier to fathom. Especially because my truck is MUCH more manageable in the middle of a city than my RV. And motor swapping into my truck is rather simple due to the nature of how the motor is mounted in my RV. So if there were a problem it would be much easier to pull the motor from my truck than my RV.
I also live on a street where I have no driveway and street cleaning twice a week so motor swapping on the street has to be pretty quick. lol

-Marc

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1965 D100 225 slant 6, NP435 Utiline.

You sound like you've got it under control and so long as you slant is ok with it go for it

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85 d-100 HEI 2BBl
06 Toyota Corrola

That is kinda what I was thinking. I figured it would be an easier break-in to do it in my truck than to make that new motor drag around 9000 pounds right off the bat also. lol

Any other advise from anyone? THANKS!!

-Marc

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1965 D100 225 slant 6, NP435 Utiline.