[ERA Chas]

I certainly agree with your basic question.
How are these motors doing the number at low compression and lift. I agree with TK's thought-it's great heads and air velocity. At least Tim's number is the result of heads, compression and big lift.
Not to pick nits but the EM Challenge this year is for 509's. Jay Brown's is 511. I read his story on FE Forum but didn't see where he's planning for the Challenge. Also, the Challenge measures average numbers between 2500 and 6500, not peaks as Jay shows in his presentation.
Please clarify if I missed something.