Engine upgrades
Safety Car
Joined: Oct 2003
Posts: 3,597
Likes: 101
From: TN PA
CI 5-6-7-8-9-10-11 Vet
LS3 Features:
Displacement increase to 6.2L from the 6.0L LS2
Horsepower increase from 400 to 430
Torque increase from 400 to 424 lb-ft.
High flow cylinder heads
Enhanced valvetrain
Higher flow intake manifold with acoustic shell
Larger bore block with structural improvements
New pistons
Higher flow injectors
The LS3 continues the Gen IV evolution by using multiple design elements to increase flow efficiency, in addition to a displacement increase, to meet the desired performance enhancement over LS2. The bore was increased to a larger 103.25 mm diameter compared to the LS2 bore of 101.6. Engine stroke remains at 92.0mm. Intake flow efficiency was optimized by straightening out and optimizing the flow path from the intake manifold into the cylinder heads. A high flow efficiency induction system is borrowed from the LS7. The cylinder head exhaust ports have been modified to increase flow.
The intake port shape size and shape have been modified to increase flow. The higher flow intake ports are similar to the L92 6.2L. Casting changes were made to increase the opening at the exhaust face to improve exhaust port flow. A new exhaust manifold opening is required to match the heads.
The inlet rocker arm is offset 6 mm between the valve tip and rocker bolt/push rod to enable a more direct intake port. The intake valve diameter is increased from 50.8 to 55.0 mm. Hollow stem intake valves were implemented to enable the 6600 rpm capability (13% reduction in mass from LS2). The 40.4 mm diameter exhaust valves are carried over from L92. Carryover LS2 high load valve springs are also included for 6600 rpm capability. Intake lift increases from 13.25mm to 14.0mm. Exhaust lobes are carryover LS2. Camshaft timing is revised.
Intake ports are revised to match the new cylinder head. The new composite intake manifold is manufactured with a lost core process to improve runner to runner variation and to reduce flow losses. In order to reduce radiated engine noise acoustic foam is sandwiched between the outside top of the intake manifold and an additional “skull cap” acoustic shell. Structural enhancements have been added to the manifold bosses.
The LS3 features an improved block with structural improvements. Casting and machining in the bulkheads was revised to improve block structure and to improve bay to bay breathing. The enhanced block is shared with the 6.2L L92 truck motors.
LS3 uses a new larger diameter piston which includes design enhancements for the higher engine output.
Higher flow 5.0 g/s injectors from the LS7 engine are used in the LS3.
Displacement increase to 6.2L from the 6.0L LS2
Horsepower increase from 400 to 430
Torque increase from 400 to 424 lb-ft.
High flow cylinder heads
Enhanced valvetrain
Higher flow intake manifold with acoustic shell
Larger bore block with structural improvements
New pistons
Higher flow injectors
The LS3 continues the Gen IV evolution by using multiple design elements to increase flow efficiency, in addition to a displacement increase, to meet the desired performance enhancement over LS2. The bore was increased to a larger 103.25 mm diameter compared to the LS2 bore of 101.6. Engine stroke remains at 92.0mm. Intake flow efficiency was optimized by straightening out and optimizing the flow path from the intake manifold into the cylinder heads. A high flow efficiency induction system is borrowed from the LS7. The cylinder head exhaust ports have been modified to increase flow.
The intake port shape size and shape have been modified to increase flow. The higher flow intake ports are similar to the L92 6.2L. Casting changes were made to increase the opening at the exhaust face to improve exhaust port flow. A new exhaust manifold opening is required to match the heads.
The inlet rocker arm is offset 6 mm between the valve tip and rocker bolt/push rod to enable a more direct intake port. The intake valve diameter is increased from 50.8 to 55.0 mm. Hollow stem intake valves were implemented to enable the 6600 rpm capability (13% reduction in mass from LS2). The 40.4 mm diameter exhaust valves are carried over from L92. Carryover LS2 high load valve springs are also included for 6600 rpm capability. Intake lift increases from 13.25mm to 14.0mm. Exhaust lobes are carryover LS2. Camshaft timing is revised.
Intake ports are revised to match the new cylinder head. The new composite intake manifold is manufactured with a lost core process to improve runner to runner variation and to reduce flow losses. In order to reduce radiated engine noise acoustic foam is sandwiched between the outside top of the intake manifold and an additional “skull cap” acoustic shell. Structural enhancements have been added to the manifold bosses.
The LS3 features an improved block with structural improvements. Casting and machining in the bulkheads was revised to improve block structure and to improve bay to bay breathing. The enhanced block is shared with the 6.2L L92 truck motors.
LS3 uses a new larger diameter piston which includes design enhancements for the higher engine output.
Higher flow 5.0 g/s injectors from the LS7 engine are used in the LS3.
Le Mans Master
Joined: Aug 2007
Posts: 7,250
Likes: 6
From: Glassboro New Jersey
LS3 Features:
Displacement increase to 6.2L from the 6.0L LS2
Horsepower increase from 400 to 430
Torque increase from 400 to 424 lb-ft.
High flow cylinder heads
Enhanced valvetrain
Higher flow intake manifold with acoustic shell
Larger bore block with structural improvements
New pistons
Higher flow injectors
The LS3 continues the Gen IV evolution by using multiple design elements to increase flow efficiency, in addition to a displacement increase, to meet the desired performance enhancement over LS2. The bore was increased to a larger 103.25 mm diameter compared to the LS2 bore of 101.6. Engine stroke remains at 92.0mm. Intake flow efficiency was optimized by straightening out and optimizing the flow path from the intake manifold into the cylinder heads. A high flow efficiency induction system is borrowed from the LS7. The cylinder head exhaust ports have been modified to increase flow.
The intake port shape size and shape have been modified to increase flow. The higher flow intake ports are similar to the L92 6.2L. Casting changes were made to increase the opening at the exhaust face to improve exhaust port flow. A new exhaust manifold opening is required to match the heads.
The inlet rocker arm is offset 6 mm between the valve tip and rocker bolt/push rod to enable a more direct intake port. The intake valve diameter is increased from 50.8 to 55.0 mm. Hollow stem intake valves were implemented to enable the 6600 rpm capability (13% reduction in mass from LS2). The 40.4 mm diameter exhaust valves are carried over from L92. Carryover LS2 high load valve springs are also included for 6600 rpm capability. Intake lift increases from 13.25mm to 14.0mm. Exhaust lobes are carryover LS2. Camshaft timing is revised.
Intake ports are revised to match the new cylinder head. The new composite intake manifold is manufactured with a lost core process to improve runner to runner variation and to reduce flow losses. In order to reduce radiated engine noise acoustic foam is sandwiched between the outside top of the intake manifold and an additional “skull cap” acoustic shell. Structural enhancements have been added to the manifold bosses.
The LS3 features an improved block with structural improvements. Casting and machining in the bulkheads was revised to improve block structure and to improve bay to bay breathing. The enhanced block is shared with the 6.2L L92 truck motors.
LS3 uses a new larger diameter piston which includes design enhancements for the higher engine output.
Higher flow 5.0 g/s injectors from the LS7 engine are used in the LS3.
Displacement increase to 6.2L from the 6.0L LS2
Horsepower increase from 400 to 430
Torque increase from 400 to 424 lb-ft.
High flow cylinder heads
Enhanced valvetrain
Higher flow intake manifold with acoustic shell
Larger bore block with structural improvements
New pistons
Higher flow injectors
The LS3 continues the Gen IV evolution by using multiple design elements to increase flow efficiency, in addition to a displacement increase, to meet the desired performance enhancement over LS2. The bore was increased to a larger 103.25 mm diameter compared to the LS2 bore of 101.6. Engine stroke remains at 92.0mm. Intake flow efficiency was optimized by straightening out and optimizing the flow path from the intake manifold into the cylinder heads. A high flow efficiency induction system is borrowed from the LS7. The cylinder head exhaust ports have been modified to increase flow.
The intake port shape size and shape have been modified to increase flow. The higher flow intake ports are similar to the L92 6.2L. Casting changes were made to increase the opening at the exhaust face to improve exhaust port flow. A new exhaust manifold opening is required to match the heads.
The inlet rocker arm is offset 6 mm between the valve tip and rocker bolt/push rod to enable a more direct intake port. The intake valve diameter is increased from 50.8 to 55.0 mm. Hollow stem intake valves were implemented to enable the 6600 rpm capability (13% reduction in mass from LS2). The 40.4 mm diameter exhaust valves are carried over from L92. Carryover LS2 high load valve springs are also included for 6600 rpm capability. Intake lift increases from 13.25mm to 14.0mm. Exhaust lobes are carryover LS2. Camshaft timing is revised.
Intake ports are revised to match the new cylinder head. The new composite intake manifold is manufactured with a lost core process to improve runner to runner variation and to reduce flow losses. In order to reduce radiated engine noise acoustic foam is sandwiched between the outside top of the intake manifold and an additional “skull cap” acoustic shell. Structural enhancements have been added to the manifold bosses.
The LS3 features an improved block with structural improvements. Casting and machining in the bulkheads was revised to improve block structure and to improve bay to bay breathing. The enhanced block is shared with the 6.2L L92 truck motors.
LS3 uses a new larger diameter piston which includes design enhancements for the higher engine output.
Higher flow 5.0 g/s injectors from the LS7 engine are used in the LS3.
Any more questions?
