GM Performance Engine Block, Cast Iron, 6-Bolt Mains, 3.990 in. Diameter Bore, 1-Piece Rear Main Seal, Chevy, LSX Bowtie (PART #GMP-19213964)

GM Performance LSX Bowtie engine blocks are designed for the advanced competition engine builder. They feature Siamese cylinder bores and a semi-finished deck height. The blocks can accept a maximum stroke of 4.250 in., a maximum bore of 4.250 in., and can support displacements of 454 cu. in. or more. LSX Bowties feature cast iron construction with an orange powdercoat finish. They accept all Gen III and IV LS-style cylinder heads, crankshafts, camshafts, and other components. Order the model with deck height and other options needed for your application.

Additional features and specs include:

• Front oil feed lines that can be plugged or restricted for mechanical flat tappet or mechanical lifter applications
• Can be safely machined to 9.200 in. deck height
• 1054 billet steel 6-bolt main bearing caps
• 6-bolt cylinder head bolt pattern
• Cam bores that can be machined to accept 60mm roller bearings
• Can be machined for larger diameter lifters
• External oil pump feed at the rear
• Added 7th transmission bolt hole to work with early-style GM transmissions
• Can accept a front motor plate for racing use
• Threaded freeze plugs that can be used for external heaters or coolers
• Windowed main bulkhead