Ford 351 Cylinder Block; Aluminum; 2-3/4 Diameter Main Bearing Journal; 4.110 Inch - 4.115 Inch Bore As Delivered/ 4.125 Inch Bore; 9.5 Inch Deck Height; 4.250 Inch Maximum Stroke Recommended; 2 Bolt Main Caps On Journals 1 And 5 And Splayed 4 Bolt Main Caps On Journals 2/ 3/ 4; Not For Sale On Pollution Control Vehicles