Well guys my engine builder kept the tolerences lose.... so now oil finishes very quickly is that ok????I am thinking of buying a Cusco Oil Catch Can....
Also i need to know how much blow should be there in a built 2.0L block

 

No one can answer that. Every car ever built, custom or factory, will be different.

Lots of blow by oil will effect your octane and subsequently your power. A catch can is probably a good idea, just be sure to check it often and empty. I know of 2 people who forgot to check theirs and when it filled up it sucked all that oil right into the cylinders and fouled their plugs.

 

Well the pistons come with specs and you can either go by those specs or you can go by what your builder recommends based on experience.