427ci Big Bore Shortblock Sleeved

Shop Inventory

• 427ci (Big Bore) LC9 siamese bore aluminum block 4.125” bore
• PowerBore Ductile Iron Performance Flange Sleeves
  • LPC 4340 Forged CCW Crankshaft 58x with 4.00” stroke (Upgrade to Callies Compstar 8CW $500)
    *Upgrade to 8CCW BIllet Molnar crank $1500*
• LPC Billet I beam rods w/ L19 bolts (Upgrade to Ultra enforcer rods $1200)
• JE Flat top -5.8cc, 1.110CH  2618 forged pistons with performance rings. (Or -20cc Dished JE Piston)
• Gapped for boost .028” top ring .030 second ring

The following services were completed in our machine shop:

• Jet wash
• Shot Peen
• CNC Sleeve Service to blueprint specs
• Line hone
• CNC Hone w/ torque plates
• Lifter bores burnished
• CNC DOD towers threaded and plugged
• Balanced under 2 gram-inches
• CNC decked in our 4th axis fixture to true crankshaft centerline.
• Front cover of block, 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 performance cam bearings
• Freeze plugs, deburred, and final cleaned
• ARP main studs
• 1600 HP capacity but over 2000 HP if below add ons are purchased
• 1/2 head stud conversion (110Ftlb tq) $750 add *fasteners included*
• Pinned main caps $750 add
• Stainless steel orings machined in sleeves (great for MLS and  high boost applications, no receiver groove required) $800 Add
• Flame Hoop machining in sleeves ($1000 includes hoops) *receiver groove in head required*
• Current lead times as of 6/1/2026 for short block builds are 2 weeks or less depending on parts!