April 5, 2026: LEMON Manuals is launched! Read the announcement.

Engine/VIN Breakdown: Notes

1999 MODEL COVERAGE

MODEL

BODY CODE ⁽¹⁾

ENGINE ⁽²⁾

ENGINE ID

FUEL SYSTEM

IGNITION SYSTEM

Astro & Safari

L, M

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

Blazer, Bravada, Envoy & Jimmy

S, T

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

Cab & Chassis & Suburban

C, K

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L65)

F

Turbo Diesel

N/A

.....

.....

7.4L (L29)

J

SFI

Magnetic ⁽³⁾

Cutaway

G

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L57)

Y

MECHFI ⁽⁴⁾

N/A

.....

.....

7.4L (L29)

J

SFI

Magnetic ⁽³⁾

Escalade

K

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

Express & Savana

G

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

.....

.....

5.0L (L30)

M

SFI

Magnetic ⁽³⁾

.....

.....

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L65)

F

Turbo Diesel

N/A

.....

.....

7.4L (L29)

J

SFI

Magnetic ⁽³⁾

Forward Control (P42)

P

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

.....

.....

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L57)

Y

MECHFI ⁽⁴⁾

N/A

Montana, Silhouette & Venture

U

3.4L (LA1)

E

SFI

DIS Magnetic

Motorhome (P32)

P

6.5L (L65)

F

Turbo Diesel

N/A

.....

.....

7.4L (L29)

J

SFI

Magnetic ⁽³⁾

Pickup ⁽⁵⁾

C, K

5.0L (L30)

M

SFI

Magnetic ⁽³⁾

.....

.....

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L65)

F

Turbo Diesel

N/A

.....

.....

7.4L (L29)

J

SFI

Magnetic ⁽³⁾

RV Cutaway

G

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

.....

.....

6.5L (L65)

F

Turbo Diesel

N/A

Sierra & Silverado

C, K

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

.....

.....

4.8L (LR4)

V

SFI

DIS Magnetic

.....

.....

5.3L (LM7)

T

SFI

DIS Magnetic

.....

.....

6.0L (LQ4)

U

SFI

DIS Magnetic

Sonoma & S-10 Pickup

S, T

2.2L (LN2)

4

SFI

DIS Magnetic

.....

.....

4.3L (L35)

W

SFI

Magnetic ⁽³⁾

.....

.....

4.3L (LF6)

X

SFI

Magnetic ⁽³⁾

Tahoe & Yukon

C, K

5.7L (L31)

R

SFI

Magnetic ⁽³⁾

Tracker

E, J

1.6L (L01)

6

MFI

DIS Magnetic

.....

.....

2.0L (L34)

C

MFI

DIS Magnetic

⁽¹⁾	Series designation.

⁽²⁾	Engine code is stamped on engine block. See ENGINE CODE LOCATION .

⁽³⁾	Uses Enhanced Electronic Ignition, utilizing a camshaft and crankshaft position sensor.

⁽⁴⁾	Mechanical fuel injection.

⁽⁵⁾	Except Sierra and Silverado.

Fig 1: VIN Character Position & Definition

G99J03060