How Good Are Stock M8 Heads?

[Durwood]

Good move on not mentioning the cam and keeping the conversation focused on your question about what the heads are capable of.

Most of the talk here is just noise. Me, I would look in the dyno section, particularly at the sheets posted by Sheffler Performance. The owner of that shop has been putting up some really good sheets using untouched M8 heads on big blocks. Those should give you an idea of what untouched M8 heads are capable of.

We see 140+ square with untouched stock M8 heads all the time.