For Sale: GM BBC Mark IV Tall Deck short block with camshaft and lifters. Block casting #473478 2 pc rear main seal. 4.280" bore. Mains have been align-honed and deck resurfaced to 10.170" Crower 4.5" stroke crankshaft Crower 6.535 rods. New Arias high compression pistons. Clevite Michigan 77 rod and main bearings. Hastings piston rings. Rotating assembly has been internally balanced. 7 1/4" Fluidamper. Bronze thrust plate and new Cloyes 9-3110A Hex-a-just timing set. Schneider solid roller camshaft and Crane roller lifters. Lifter valley has been fitted with a debris screen. Additional set of 4.310" bore CP Pistons.