Engine - GM Performance Short Block Engines - Aluminum V8 Block for big Displacement Engines.

From GM Performance - This tall deck (9.525 inch) aluminum block can be bored to (4.160 inch) and stroke to (4.125 inch with minor modification and 4.250 inch stroke with major modifications). The deck height is 9.525 inch with a 1.125 inch deck surface that can be machined as low as 9.000 inch. the bores start at 4.119 inch and can be bored to 4.160 inch with a 2.65 (400 type) main bearing size and the camshaft is raised 0.391 inch from production location. Technical Note: Special oil pan, camshaft, and timing chain are required for this block. Use cam bearing kit P/N 12370843.