' For me - when I couldn't stop the oil from coming out the top of the valve covers. Talking autocross here - with sticky tires - on slopes.
It's just a variant on the Trans-am set ups, which is also similar to the circle track setups.
We also extended the top baffle in those covers. If you look inside OEM covers - at least early ones, they're much more extensive than those cast covers. That's should be enough for anything but road racing or similar.
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