427ci LT1 Gen V Sleeved

Shop Inventory

• 427ci (Big Bore) LT1 GEN V aluminum block 4.125” bore
• PowerBore Ductile Iron Performance Flange Sleeves
  •  4340 Forged Crankshaft 58x with 4.00” stroke
• LPC Billet I beam rods w/ L19 bolts
• Mahle Flat top -5cc 1.110CH  2618 forged pistons with performance rings.
• Gapped for boost .028” top ring .030 second ring

The following services were completed in our machine shop:

• Jet wash
• CNC Sleeve Service to blueprint specs
• Line hone
• CNC Hone w/ torque plates
• Lifter bores burnished
• CNC DOD towers threaded and plugged
• Oil Squirters Plugged
• Balanced under 2 gram-inches
• CNC decked in our 4th axis fixture to true crankshaft centerline.
• Oil valley, and oil pan rails are machined flat as well
• Mains are at .0025” clearance
• Rods are .0024” oil clearance
• ACL main bearings
• ACL rod bearings
• Durabond Coated performance cam bearings
• Freeze plugs, deburred, and final cleaned
• ARP main studs
• Current lead times as of 6/1/2026 for short block builds are 2 weeks or less depending on parts!