I used to think the same thing, now I'm not so sure. Case in point: my '91 SHO has a 3 liter 6 cylinder engine (Yamaha). That means that each cylinder is 30.5 cubic inches. STOCK head flow on it is 220cfm @ 28". That's 7.2 cfm per cubic inch. A 360 using the same ratio would have heads flowing 324cfm.

What I am seeing on the OEM front here in the States is good head flow with shorter cam timing. So you have Hemis with 250 cfm ports making one hp/cubic inch with less than 200 degrees at 50 cam timing.

So he may be on to something.

R.