I bought my 330 CFM eheads from Dave at SD Performance. Although they have the earlier combustion chamber design Dave did modified the drain back holes to improve drain back. I think the need for putting on the external hoses for improved drain back may be somewhat dependent on the RPM that your engine is running at. Because of my cam specs my converter stall is 4,400 and I shift at 5,600 and shifting any higher does not improve ET or MPH. So at my RPM I don't believe I have any oil starvation issues. If I was shifting at 7,000 or higher then I would definitely install the drain back lines of get an accumulator to prevent oil starvation.
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Tim Corcoran
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