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When studying the performance stuff for the Salt Flats attempt(s), I learned higher compression improved power. And to reduce knock, allowing the use of high compression, the smoother the combustion chamber, the better.
So if that's true, it seems the groove would do the OPPOSITE as a super-smooth combustion chamber and increase the tendency to knock. To save the engine, the compression would need to be lowered (reducing power) or use the other tricks (retarded timing, higher octane gas, water injection....) to fight knock.
I know we were looking for POWER during that time, but it seems this was one of those things that increase both power AND economy (overall efficiency), so my guess is it would hurt, not help.
And again, statements like "up to 42.5% improvement" just SCREAM "B.S."
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