A Big-Block for Your Truck and it’s Compatible with Gasoline, CNG, or LPG!
When it comes to grunt work – like pulling your car hauler or offshore racing boat – Chevrolet Performance’s new, heavy-duty 8.0L Big-Block does the job like no other engine.

This latest edition of the classic Big-Block is all about torque and makes up to 475 lb.-ft. (on gasoline) by only 3,200 rpm – and maintains a smooth, flat and useful torque band across the entire rpm range. That gives your truck the power to pull just about anything and flatten the steepest grades.

The 8.0L is built with a tall-deck (10.2-inch deck height) version of our latest Big-Block casting, which features full-length water jackets, thicker main bearing webs and four-bolt main caps. It also uses a forged steel crankshaft and forged connecting rods for optimum strength. A long, 4.250-inch stroke helps maximize the torque.

This modern Big-Block is equipped for a crank-triggered ignition system and features a 4X camshaft and 58X crankshaft reluctor wheels to support it. The engine can support fuel injection and also has a provision for a mechanical fuel pump.* Our assembly comes with heads and a balancer installed. An induction system, ignition, starter, water pump and other accessories are required to finish the engine.

NOTE: This engine requires an intake manifold designed for a tall-deck block. Chevrolet Performance intake manifold P/N 88961161 was used in development. Conventional big block intake manifolds can be used with spacers (not included).

*Production 8.0L camshaft does not have a fuel pump lobe.

Vortec 8.0L TECH SPECSPart Number: 19256938

Engine Type: Chevy Big Block V 8
Displacement (Litre): 8.0L
Displacement (cu in): 488
Weight: 602
Horse Power: 315/375
Torque: 390/475
Bore x Stroke (in): 4.270x4.250
Block (P/N 19256820): Tall Deck (10.2")
Fuel Requirements: LPG/CNG
Crankshaft (P/N 19300876): Forged Steel
Connecting Rods (P/N 19256831): Forged Steel
Firing Order: 1-8-7-2-6-5-4-3
Connecting Rod Ratio: 1.58:1
Pistons (19256829): Hypereutictic w/Anodized Top Ring Land
Camshaft Type (P/N 12556291): Hydraulic Roller
Cylinder Heads (P/N 19256827): Fast Burn Iron
Damper (P/N 19256830) Cast Iron
Valve Train: Fully Adjustable
Compression Ratio: 9.9:1 Nominal
Crankcase capacity: 8 Qts
Maximum Recommended Rpm: 4,500
Balanced: Internal

INSTALLATION NOTES

• Designed for gasoline or CNG /LPG on-highway applications
• Tall deck block design (10.2" deck height)
• Full length water jackets (non-siamesed cylinders)
• Thicker main bearing webs with four bolt main caps
• Forged steel crankshaft and connecting rods
• Double row roller timing chain
• Anodized pistons with full floating wrist pins offer CNG/LPG capability
• Hardened valve seats (intake and exhaust) for CNG/LPG durability
• Stainless steel intake and exhaust valves for CNG/LPG durability
• Adjustable valve train.
• “Fast Burn” cylinder heads for fuel efficiency and power
• 58x Crankshaft positioning sensor capability
• 4x Camshaft positioning sensor capability
• Flat-response knock sensor capability
• Coil-near-plug configuration