LS Engine Specifications

Replacing the old tried and true small block Chevy engine with a new version would not be an easy task. The new small block is known as the LS engine family and has more than successfully replaced 350's and 305's that were based in design from the 1950's. LS engines are available in a range of displacements and are all based on the same design characteristics. You'll find LS engines in many high performance vehicles in the GM lineup as well as engine replacements in hot rods, muscle cars and street trucks. If you're building an LS engine, you'll find good information here to help you get it done.

LS Engine and Cylinder Head Casting Number Locations
Block: Left rear, top of block just forward of the bellhousing mounting surface.
Cylinder Head: Head casting numbers are found externally at the far right end of the head on the exhaust-port side.

LS Engine Firing Order - 1-8-7-2-6-5-4-3

LS V8 Firing Order

Torque Specs

Bolts or Engine Parts to Torque	Amount to Torque or Turn (Degrees) to:
Camshaft Retainer Bolts	18 lb ft
Camshaft Sensor Bolt	18 lb ft
Camshaft Sprocket Bolts	26 lb ft
Connecting Rod Bolts - First Design (First Pass)	15 lb ft
Connecting Rod Bolts - First Design (Final Pass)	60 degrees
Connecting Rod Bolts - Second Design (First Pass)	15 lb ft
Connecting Rod Bolts - Second Design (Final Pass)	75 degrees
Crankshaft Balancer Bolt (Installation Pass-to Ensure the Balancer is Completely Installed)	240 lb ft
Crankshaft Balancer Bolt (First Pass-Install a NEW Bolt After the Installation Pass and Tighten as Described in the First and Final Passes)	37 lb ft
Crankshaft Balancer Bolt (Final Pass)	140 degrees
Crankshaft Bearing Cap Bolts (Inner Bolts-First Pass in Sequence)	15 lb ft
Crankshaft Bearing Cap Bolts (Inner Bolts-Final Pass in Sequence)	80 degrees
Crankshaft Bearing Cap Side Bolts	18 lb ft
Crankshaft Bearing Cap Studs (Outer Studs-First Pass in Sequence)	15 lb ft
Crankshaft Bearing Cap Studs (Outer Studs-Final Pass in Sequence)	53 degrees
Crankshaft Position Sensor Bolt	18 lb ft
Cylinder Head Bolts (First Pass all M11 Bolts in Sequence)	22 lb ft
Cylinder Head Bolts (Second Pass all M11 Bolts in Sequence)	90 degrees
Cylinder Head Bolts (Final Pass all M11 Bolts in Sequence-Excluding the Medium Length Bolts at the Front and Rear of Each Cylinder Head)	90 degrees
Cylinder Head Bolts (Final Pass M11 Medium Length Bolts at the Front and Rear of Each Cylinder Head in Sequence)	50 degrees
Cylinder Head Bolts (M8 Inner Bolts in Sequence)	22 lb ft
Engine Flywheel Bolts	74 lb ft
Engine Flywheel-to-Torque Converter Bolts	44 lb ft
Engine Front Cover Bolts	18 lb ft
Engine Rear Cover Bolts	18 lb ft
Engine Valley Cover Bolts	18 lb ft
Exhaust Manifold Bolts	18 lb ft
Fuel Injection Fuel Rail Bolts	89 lb in
Intake Manifold Bolts (in sequence)	89 lb in
Knock Sensors	15 lb ft
Oil Pan M8 Bolts (Oil Pan-to-Engine Block and Oil Pan-to-Front Cover)	18 lb ft
Oil Pan M6 Bolts (Oil Pan-to-Rear Cover)	106 lb in
Valve Rocker Arm Bolts	22 lb ft
Valve Rocker Arm Cover Bolts	106 lb in
Water Inlet Housing Bolts	11 lb ft
Water Pump Bolts (First Pass)	11 lb ft
Water Pump Bolts (Final Pass)	22 lb ft
Water Pump Cover Bolts	11 lb ft

LS Cylinder Head Bolt Tightening Sequence

LS engine cylinder head bolt tightening sequence

LS Intake Manifold Bolt Tightening Sequence

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