Is this housing reusable? It has very light scoring..did my best to show here
but you can feel it when you run your finger across it

 

can you feel it with your fingernail?

 

Just barely..before we tore the engine apart I did a compression test and it was fine

 

usually, if you cant catch your fingernail on the striations, then its good..... make sure to pay close attention to spark plug hole and look for cracks as well

also look for any flaking of the chrome near the edges.

 

yea nothing catches but you can feel the scoring