AF96-1020 - AEROFLOW BARE ENGINE BLOCK FITS GM LS 4.00"

Cast Iron GM LS Engine Block, 4.000" Bore
9.240" Deck Height, 6-Bolt Main Caps

Aeroflow Performance engine blocks are the ideal starting point for any street performance build that demands quality and precision at a reasonable price. Why start your engine build with a worn-out production block from decades ago that needs hours of machine work. When you can start with a new heavy-duty cast iron engine block that is a semi-finished bare engine block that requires very little machining to match your internal components. These brand-new aftermarket GM LS engine blocks are cast from premium high-strength Class 32B iron. The extra thick standard deck height ensures a reliable head gasket seal as well as allowing the use of off the shelf standard components such as camshaft, timing chain, oil pump/pan and oil filter etc. Featuring dual knock sensor locations in both the valley and the side of the engine block allowing either LS1 or LS2 style knock sensors to be used. Along with the cam position sensor in the rear of the valley which can also be blocked off to run the front cam sensor only. You can rest assured that these Aeroflow engine blocks have a great foundation for your next engine build.

Cylinder Bore Diameter: 4.000"
Max Bore& Stroke: 4.030" x 4.000"
Cam Journal OD: STD, 2.164"
Cam Location: STD
Deck Height: 9.240"
Fuel Pump: Electrical
Freeze Plugs: STD screw in
Lifter Bores: .843"
Main Bearing Size: 2.558"
Main Bearing Bore: 2.750"
Main Cap Bolts: 6 Bolt
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
Stud Holes, Head: Blind Holes
Timing Chain/ Gears: STD
Timing Cover: STD
Weight: 110kg (242 lbs.)

• 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.