Product Overview
The LS3 gets a big cam and carbureted intake manifold for an additional 85 horsepower!
You know that the LS3 is the hot new small-block V-8 in the GM arsenal, but you still want more. We proudly offer you the LS376/515, an upgraded LS3 that is equipped with an aggressive camshaft and GM Performance Part’s exclusive carbureted intake manifold. Two simple upgrades that add up to 515 horsepower—an 85 horsepower bump over the stock LS3.
The LS3 comes fully equipped with components that only a few years ago would have been the exclusive property of race engines. The block is a rock-solid 6-bolt foundation that holds together the 4.06" bore by 3.62" stroke rotating assembly. The LS3 heads are high-flowing rectangular port aluminum castings. What separates the LS376/515 from the base LS3 is the addition of a GM Performance Parts high performance camshaft and a carbureted intake manifold.
To match the high flow rate of the LS3 cylinder heads, our GM Performance Parts engineers installed the “ASA Hot Cam” (P/N 12480110). This is a hydraulic roller camshaft that offers up .525" intake and exhaust valve lift numbers and duration @.050" of 226˚ intake and 236˚ exhaust.
The GM Performance Part engineers coupled that aggressive camshaft and high flowing cylinder head design with our new carbureted intake manifold specific for the L92/LS3 cylinder heads (P/N 25534401). The manifold offers a dramatic increase in horsepower and a simplified installation.
TECH SPECS:
- Engine Type: LS Series Gen IV small-block V8
- Displacement (cu in): 376 cu in (6.2L)
- Bore x Stroke (in): 4.06 x 3.62 (103.25 x 92mm)
- Block (P/N 12584727): Cast aluminum with 6-bolt, cross-bolted main caps
- Crankshaft (P/N 12597569): Nodular iron
- Connecting Rods (P/N 12617570): Powdered metal
- Pistons (P/N 19165089): Hypereutectic aluminum
- Camshaft Type (P/N 12480110): Hydraulic roller
- Valve Lift (in): .525" intake / .525" exhaust
- Camshaft Duration (@.050 in): 226° intake / 236° exhaust
- Cylinder Heads (P/N 12598594): LS3 rectangle port; as cast with 68cc chambers
- Valve Size (in): 2.16 int / 1.59 exhaust
- Compression Ratio: 10.7:1
- Rocker Arms (P/N 12569167 int): Investment cast, roller trunnion
- Rocker Arms (P/N 10214664 exh): Investment cast, roller trunnion
- Rocker Arm Ratio: 1.7:1
- Recommended Fuel: 92 octane
- Maximum Recommended rpm: 6600
- Reluctor Wheel: 58X
- Balanced: Internal
INSTALLATION NOTES
14" automatic transmission flexplate included.
Assembly does not include any electronics.
Use LSX ignition controller P/N 19171130
Includes Corvette wet sump oil pan.
Intended for pre–1979 street vehicles or any off-road vehicle.
Not intended for marine applications.
770-cfm carb P/N 19170093 recommended for daily street use.
Engine Type: LS Series Gen IV small-block V8
Displacement (cu in): 376 cu in (6.2L)
Bore x Stroke (in): 4.06 x 3.62 (103.25 x 92mm)
Block (P/N 12584727): Cast aluminum with 6-bolt, cross-bolted main caps
Crankshaft (P/N 12597569): Nodular iron
Connecting Rods (P/N 12617570): Powdered metal
Pistons (P/N 19165089): Hypereutectic aluminum
Camshaft Type (P/N 12480110): Hydraulic roller
Valve Lift (in): .525" intake / .525" exhaust
Camshaft Duration (@.050 in): 226° intake / 236° exhaust
Cylinder Heads (P/N 12598594): LS3 rectangle port; as cast with 68cc chambers
Valve Size (in): 2.16 int / 1.59 exhaust
Compression Ratio: 10.7:1
Rocker Arms (P/N 12569167 int): Investment cast, roller trunnion
Rocker Arms (P/N 10214664 exh): Investment cast, roller trunnion
Rocker Arm Ratio: 1.7:1
Recommended Fuel: 92 octane
Maximum Recommended rpm: 6600
Reluctor Wheel: 58X
Balanced: Internal
Optional 770cfm Carburetor
Features show-car-quality polished finish
Dual feed, center-hung float bowls
Vacuum secondaries
Automatic electric choke
Quick-change adjustable vacuum secondary
Recommended for Small-Block and Big-Block engines, including street, competition, towing and off-road vehicles
Bolts and gaskets included
Replaces Holley 4160 750-cfm carburetor
