Re: Flat collectors
This may seem a little irrelevant to some, but the VW Formula Vee guys have debated flat style 4-1 versus the more traditional square 4-1 collectors for a long time. Those guys run old, stock, small port single carb engines that have been tweaked by some pretty bright guys since the 1960's. At 50-some-odd hp output, they'd give their eye teeth for 3hp. Since you don't see one style or the other exclusively in use, my guess is there isn't a lot to be lost, or gained, if the rest of the header has been sized and constructed right.
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