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I have run several "half filled" (whatever it means) BB's in the street, and I think there is not much difference in how the small block works. With about a 1/4 fill no problems, with about half fill problems with long highway driving. The oil got hot and lost it's viscosity and the oil pressure came down, something like 30 in the highway and about zero at idle. Synthetic brought that up some 10-15 psi and haven't played with those things ever since. E 85 will definitely make a difference keeping things cooler overall. With ethnol or methanol engines, one problem is getting the oil warm enough. I would use an engine oil cooler in the street with a filled block, although despite of the drop in oil pressure, there never was any sign of damage.

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