>>28495112Anon, those are machining marks.
Often times you can't feel them with your nail.
Even though they look large
>>28494946 (OP)It's crazy how far heads have come.
You can just buy 300 CFM heads now for everything.
30years ago that would have been a racing engine head.
Now 300cfm is chump change with 400cfm stuff available.
400cfm was race head Big block head territory with 400cc intake runners.
Not anymore.