Product Description
Aluminium GM LS Engine Block, 4.125" Bore 1/2" Head Studs
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.
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
