Oil Viscosity and stroker questions

[ricky50]

Hi there,

I have a recently built (not fired yet) stroker built for me and i was told to break it in with 10w 40 and then switch to a 20w 50 synthetic or non synthetic.

I am told that the viscosity choice was dictated by the clearances of the engine.

Would that mean that the engine is built loose?

By going to a 5w 20 or 30 ami going to hurt this engine or not?

What are the advantages/disadvantages of tight and loose engines?

 

[OutlawPony]

I would say it is built loose.

I don't see the reason you where told to run such a thick oil.

 

[HISSIN50]

What is the purpose of the engine?