7 mains, 4X4.25 and 4X4.5 bore and stroke for the big sixs. Steel cranks without counter weights.Blokes have "Molly" cast into them. 3 intake ports with six exhausts. Room for big block valves. Makes a Hudson 308 look wimpy! Biggest problem I could see was a rather close bore spaceing but the head bolts are large. They look like an engine with real potential. If memory serves me well (and at times it don't) JDX was the family name with another letter added for the 4.5 stroke version. I gave one to Jerry Weigt, just too many projects. Worth looking at! Armond
