BluePrint Engines GM LS Compatible Bare Block – 9.240 Deck x 4.125 Bore, SIAM, Ductile Cast Main Caps, 4-Bolt

Description
Warranty

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):

4.120" to 4.122"

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:

Ductile Cast Iron, 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

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

WARNING: Cancer and Reproductive Harm

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Bragging Rights Included.

EVERY BLUEPRINT ENGINE ACES THE DYNO TEST

We make sure we hit our target horsepower and proper torque with every crate engine. We use an advanced computerized balancer in our in-house dyno testing rooms to get our rotating assemblies within two grams, ensuring silky smooth power over the entire RPM range. That’s precisely why our engines sound and run better than our competitors.

All specs, zero speculation: A comprehensive, dyno-generated printout showing your critical engine specs will accompany your delivered engine — every time. No more guessing or wondering what your installed engine’s real-world peak horsepower and torque ratings actually are. Any doubters in the crowd? Simply flash ‘em your exact engine’s dyno results.

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Overview:

Cylinder Bore (Rough):

Cylinder Bore (Max):

Cam Bearings:

Cam Bearing Bore ID:

Camshaft Position:

Cam Drive / Timing Set:

Cam Retaining Plate:

Cubic Inch (Max):

Cylinder Wall Thickness:

Cylinder Skirt Length:

Deck Height:

Deck Thickness:

Freeze / Core Plugs:

Head Bolt / Stud:

Head Bolt / Stud Threads:

Lifter Bores:

Lifter Retainer (If not using tie car lifters):

Main Bearing Bore (Line Honed):

Main Bearing Caps:

Main Cap Bolts:

Main Fastener Tensile Strength:

P1 Main Stud Kit P/N:

ARP Main Stud Kit P/N:

Material (Block):

Oil System:

Oil Pump:

Oil Filter:

Oil Pan:

Rear Main Seal:

Starter:

Stroke (Max):

Timing Cover:

Valley Cover:

AFM/DOD Compatible:

Approx. Weight with Main Caps:

Better Than the Rest.

Already Own this engine?

EVERY BLUEPRINT ENGINE ACES THE DYNO TEST

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Overview:

Cylinder Bore (Rough):

Cylinder Bore (Max):

Cam Bearings:

Cam Bearing Bore ID:

Camshaft Position:

Cam Drive / Timing Set:

Cam Retaining Plate:

Cubic Inch (Max):

Cylinder Wall Thickness:

Cylinder Skirt Length:

Deck Height:

Deck Thickness:

Freeze / Core Plugs:

Head Bolt / Stud:

Head Bolt / Stud Threads:

Lifter Bores:

Lifter Retainer (If not using tie car lifters):

Main Bearing Bore (Line Honed):

Main Bearing Caps:

Main Cap Bolts:

Main Fastener Tensile Strength:

P1 Main Stud Kit P/N:

ARP Main Stud Kit P/N:

Material (Block):

Oil System:

Oil Pump:

Oil Filter:

Oil Pan:

Rear Main Seal:

Starter:

Stroke (Max):

Timing Cover:

Valley Cover:

AFM/DOD Compatible:

Approx. Weight with Main Caps:

Better Than the Rest.

Already Own this engine?

EVERY BLUEPRINT ENGINE ACES THE DYNO TEST