I have been messing around with a couple Buick 215 all aluminum motors recently (61-63).  Tonight I looked at a 215 bare block setting on the bench and behold:  the block skirts come well below the crank centerline, in close proportionis to the Y. 

The Lincs, MELs, FEs, and now BOP 215s?

Mike, located in the Siskiyou mountains, Southern, OR 292 powered 1946 Ford 1/2 ton, '62 Mercury Meteor, '55 Country Squire (parting out), '64 Falcon, '54 Ford 600 tractor.