Chevrolet Performance Chevy Performance LSX Cast Iron Block - 4.065 Bore Finished 19417352

The Chevrolet Performance LSX Cast Iron Block is purpose-built for serious engine builders who demand maximum displacement potential and proven reliability in high-competition environments. With a 4.065" finished bore and semi-finished 9.240" deck, this block accommodates strokes up to 4.250" and supports 454+ cubic inches—giving you the foundation for genuine power gains. The robust cast iron construction, coupled with 1054 billet steel main caps and extensive machining flexibility, makes this block the go-to choice for naturally aspirated and forced induction applications alike.

• LSX cast iron block
• 4.065" finished bore
• 9.240" deck height
• Supports 4.250" stroke maximum
• Accommodates 454+ cu. in. displacement
• Siamese cylinder bores
• 1054 billet steel main caps
• 6-bolt main bearing configuration
• 6-bolt cylinder head pattern
• Gen III/IV LS-compatible
• 1-piece rear main seal
• Machined to 9.200" deck capable
• 60mm roller bearing cam option
• Front oil feed lines included
• External rear oil pump feed
• Windowed main bulkhead
• Threaded freeze plugs
• 7th transmission bolt hole
• Front motor plate compatible
• Orange powdercoat finish
• Bare block, finished bore
• MPN: 19417352