BluePrint Engines Bare Block - 468 c.i. - LS, SIAM, 9.240 x 4.000, CAST MC, 4 HD BLT

Overview:

When your LS build demands serious displacement, you need a block that’s engineered to go the distance—and this LS-compatible foundation is built to stretch all the way to an impressive 468 cubic inches. With reinforced architecture, thick cylinder walls, and precision-machined surfaces, it delivers the rigidity and reliability needed for high-horsepower, high-rpm combinations. Whether you’re assembling a torque-rich street monster, a boosted track bruiser, or a no-compromise stroker setup, this block gives you the headroom and confidence to push your LS platform far beyond stock limits. Big inches, big power, and rock-solid dependability start right here.

Cylinder Bore (Rough):

• 3.989" to 3.991"

Cylinder Bore (Max):

• 4.185"

Cam Bearings:

• Dura-Bond CH-25

Cam Bearing Bore ID:

• #1 & 5: 2.3482±.0005", #2 & 4: 2.3285±.0005", # 3: 2.3088±.0005" w/ stock available to bore up to 2.362" (60mm)

Camshaft Position:

• Stock OEM position - 4.885" to Crank

Cam Drive / Timing Set:

• Accepts OEM style

Cam Retaining Plate:

• BluePrint Engines P/N:18111370

Cubic Inch (Max):

• 468 in3

Cylinder Wall Thickness:

• .210" @ 4.185" Bore

Cylinder Skirt Length:

• 5.750"

Deck Height:

• 9.240" +.005/-.000"

Deck Thickness:

• .600"

Freeze / Core Plugs:

• 1 5/8" dia, BluePrint Engines p/n: 10110016 (Qty 8)

Head Bolt / Stud:

• 4 Per Cylinder

Head Bolt / Stud Threads:

• M11 x 2.0 2.36" Deep (+M8 uppers)

Lifter Bores:

• .8437 ±.0005"

Lifter Retainer (If not using tie car lifters):

• BPE and LSX

Main Bearing Bore (Line Honed):

• 2.7509 / 2.7514"

Main Bearing Caps:

• Billet Steel, OEM Style, 6 Bolts Per Cap

Main Cap Bolts:

• Inner: M10 x 102mm, Outer: M10 x 84mm (stud), Skirt: M8 x 24mm

Main Fastener Tensile Strength:

• 180,000 to 210,000 PSI

P1 Main Stud Kit P/N:

• TBD

ARP Main Stud Kit P/N:

• TBD

Material (Block):

• EN-GJL-250 Iron

Oil System:

• Priority Main Oiling System w/ Center Crossover

Oil Pump:

• OEM

Oil Filter:

• OEM (in Oil Pan)

Oil Pan:

• OEM

Oil Gallery Plug / Barbell / Dogbone (rear):

• OEM

Piston Oilers / Squirters:

• No

Rear Main Seal:

• Accepts OEM Style Rear Cover

Starter:

• OEM, Passenger Side Only

Stroke (Max):

• 4.250"

Timing Cover:

• OEM

Valley Cover:

• OEM

AFM/DOD Compatible:

• No

Approx. Weight with Main Caps:

• 220-240lbs

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