LS1 Engine

LS1 Engine Details

Size: 5.7 L 346 Ci

Bore: 3.893 inches

Stroke: 3.622

Hp: 97-2000 345 @ 5600 rpm 350 ft-lb of torque @ 4400 rpm

Hp: 2001-04 350 @ 5600 rpm 375 ft-lb of torque @ 4400 rpm

MAF sensor size: 75 mm

Throttle body size: 75 mm

Spark plug: AC 41-931

Spark plug gap: 1.5 mm

Oil Pressure relief setting 60 Psi @ 5000 rpm

Block Material: Aluminum 319-T5

Year/Casting #

97-99, 12550592

2000, 12559378

2001-2004, 12561168 LS6 Style

The Aluminum LS1 Gen III V-8 block only weighs 103 lbs! Has 6 bolt main caps. The centrifugally cast iron liners are manufactured in a centrifuge then cast into place in the block during the pour of molten metal.

These liners have very little tolerance for rework! 97-98 blocks can only be honed out .004 inches. The 99 and later can be a max of .010 over.

The Stock crank has been known to handle over 500 hp Naturally Aspirated and 650 hp in Forced Induction uses! The rolled fillets on the crank journals are the biggest contributor to its strength.

LS1 Head Details

Rocker Ratio: 1.7:1

LS1 Head	Casting #
97-98 (Perimeter Bolt Valve Covers)	10215339,	12558806
99-01	12559853
01-04	12564241,	12559853

Valve Angle: 15 Degrees
Valve Size: Intake 2.0 Exhaust 1.55
Combustion Chamber Size: 66.67
Single Use Head Bolts
Visual Cues For Differences : LS1 Exhaust Port Oval LS6 D-shaped

How to Build High-Performance Chevy LS1/LS6 V-8s (SA Design)

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