Aeroflow Aluminium GM LS Engine Block, 4.125" Bore
Brand: Aeroflow
Part Number: AF96-1024-CON
Description:
Aeroflow Aluminium GM LS Engine Block, 4.125" Bore
9.240" Deck Height, 6-Bolt Main Caps
Aeroflow Performance aluminium engine blocks are the ideal foundation for any high-performance engine build that demands strength, precision, and reliability. Manufactured from heavy-duty cast aluminium alloy, these brand-new semi-finished engine blocks utilize premium Darton sleeves for exceptional durability and performance. Designed to require minimal machining, these bare engine blocks are engineered to suit a wide range of internal component combinations readily available off the shelf.
The thick deck height provides superior head gasket sealing, while the priority main oiling system and dual lifter crossover provisions ensure consistent oil flow throughout the engine block under demanding conditions. Strength is further enhanced with upgraded 1/2" head studs and 7/16" main studs, combined with billet steel main caps featuring splayed outer studs for maximum bottom-end stability.
The block also provides crankshaft clearance for up to a 4.100" stroke, making it ideal for serious naturally aspirated, turbocharged, or supercharged applications. This aftermarket alloy engine block retains compatibility with many standard GM LS off-the-shelf components including camshafts, timing chains, oil pumps, oil pans, and oil filters, helping simplify the engine build process while reducing overall costs.
Specifications
Material: Cast Aluminum Alloy
Max Bore & Stroke: 4.165" x 4.100"
Cylinder Bore Diameter: 4.125"
Head bolt / stud size: 1/2" upgrade
Cam Journal OD: STD, 2.164"
Cam Location: STD - bearings can be pinned
Deck Height: 9.240"
Fuel Pump: Electrical
Freeze Plugs: STD screw in
Lifter Bores: .843"
Main Housing Bore Size: 2.750"
Main Cap Bolts: 7/16" Upgrade, with splayed outer bolts on main bearing caps
Main Caps: Billet Steel
Oil Filter: STD
Oil Pan: STD
Rear Main Seal: STD 4.527"
Serial No. Location: Left Front & Main Caps
Starter: STD
Timing Chain / Gears: STD
Timing Cover: STD
Important Information
- Sizes in reference to Deck Height, Cylinder Bore, Wall Thickness, etc, listed in these instructions are Nominal. This Block must be professionally finish machined.
- Due to a vast difference of opinion among professional builders regarding specifications and procedures, all blocks, when purchased bare, are finished within factory +/- tolerances. Tighter than factory or OE specs when applicable.
- Cam bearing OD should be de-burred before installation.
- When initially removing main caps, the caps & block should be de-burred before reinstalling; this will insure that correct main size is maintained.
- This Block should be assembled by experienced, professional engine builders. Many parameters such as Cylinder Bores will need additional, professional machine work.
- Many pistons are oversized, and cylinder bore must be honed to correct skirt clearance. Very few aftermarket components are drop ins to any engine block, without additional checking/machining.
