Steve,
Our engines arent limited by the exhausts believe it or not. So I guess we have to agree to disagree. Even my Super Stock OEM 455SD head's exhausts flowed over 300 cfm, so we had to cut them back to 262 by decreasing the valve seat angle. Of course in NHRA raising the exhaust ports are illegal.
We did a set of Wenzlers for a comp eliminator engine before NHRA sprung the part number rules on us. We had the intakes flowing 428 with a 2.3 valve and had no problem visualizing 460 to 470 cfm with a 2.4 valve. We had just redesigned the combustion chamber and the valve sizes to get that 2.4 in there, and the exhaust still wasnt the limiting factor.
Over scavaging with too much exhaust can get you into trouble. Of course if you are running a blower, then the story might be different. We dont do that kind of stuff.
Lynn
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