GM Parts Depot Chevy Small-Block Camshaft Quick Reference Chart

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CHEVY SMALL-BLOCK V8

CAMSHAFTS

SMALL-BLOCK V8 CAMSHAFTS QUICK REFERENCE CHART

Number Part

Description

Duration atLash Point (degrees)

Duration at .050" Tappet Lift (degrees)

Maximum
Lift with
1.5:1
Rocker
Ratio

Valve Lash

Lobe Centerlines (degrees)

Notes

12523897

Hydraulic flat tappet

I: 2 94
E : 2 9 4

I: 2 02
E : 2 0 6

I:. 403"
E:.415"

Zero/Zero

1 1 5

83-86 305ci Z-28 and L-69 Camaro.

3863151

Hydraulic flat tappet

I: 3 20
E : 3 2 0

I: 2 21
E : 2 2 1

I:. 447"
E:.447"

Zero/Zero

1 1 4

65-67 Corvette and Chevy II L-79 cam. Excellent power and torque. ID# 3863152.

3896962

Hydraulic flat tappet

I: 3 12
E : 3 1 2

I: 2 22
E : 2 2 2

I:. 450"
E:.460"

Zero/Zero

1 1 4

69-81 L-46 and L-82 Corvette cam. Moderate torque, excellent power. ID# 3896964.

24502476

Hydraulic flat tappet

I: 3 20
E : 3 2 4

I: 2 12
E : 2 2 2

I: 435"
E : 460"

Zero/Zero

112.5

350-300 HP Special performance engine 12355345.

3972178

Mechanical flat tappet

I: 3 00
E : 3 1 2

I: 2 42
E : 2 5 4

I:. 435"
E:.455"

I: 024"
E : 030"

1 1 6

70-71 Corvette and Camaro LT-1 cam. Good all around street mechanical cam. ID# 3972182.

3965754

Mechanical flat tappet

I: 3 18
E : 3 2 7

I: 2 62
E : 2 7 3

I:. 488"
E:.509"

I:.024"
E : 026"

1 1 2

Second design racing cam; good short track and road racing cam for 350ci and larger V8. Use with spring P/N 330585.ID#3965751.

14093643

Hydraulic roller tappet

I: 2 94
E : 2 9 4

I:202
E : 2 0 6

I:. 403"
E:.415"

Zero/Zero

1 1 5

87 350ci Corvette and IROC-Z Camaro.

14097395

Hydraulic roller design

I: 2 88
E : 3 0 8

I: 1 96
E : 2 0 6

I: 4 31
E : 4 5 1

Zero/Zero

1 0 9

383 Truck with 1.5 rockers

10134334

Hydraulic roller tappet

I: 3 36
E : 3 3 6

I: 2 35 E : 2 3 5

I:. 480"
E:.480"

Zero/Zero

1 1 4

5.7-liter H.O. engine asm. cam. Use with spring P/N 10134358. For ZZZ through ZZ2 engines.

10185071

Hydraulic roller tappet

I: 2 75
E : 2 8 0

I: 2 08
E : 2 2 1

I: 474"
E : 510"

Zero/Zero

1 1 2

5.7L HO 350 ZZ3 engine Use with spring P/N 10134358.

12551705

Hydraulic roller tappet

N/A

I: 2 01
E : 2 0 8

I:. 447"
E:.459"

Zero/Zero

N/A

1995-97 LT1 Corvette-Camaro.

12551142

Hydraulic Roller LT4 Production Cam

N/A

I: 2 03
E: 210

"1.6 Rocker"
I: 4 76
E: 480

Zero/Zero

1 1 5

Production LT4 Cam 1996.

24502586 1.5 Rocker

Hydraulic Roller (LT4 Hot Cam)

I: 2 79
E : 2 8 7

I: 2 18
E : 2 2 8

"1.5 Rocker"
I: 4 92
E : 4 9 2

Zero/Zero

1 1 2

Service only. For all V8 engines with roller camshafts. See Note #1.

24502586 1.6 Rocker

Hydraulic Roller (LT4 Hot Cam)

I: 2 79
E : 2 8 7

I: 2 18
E : 2 2 8

"1.6 Rocker"
I: 5 25
E : 5 2 5

Zero/Zero

1 1 2

Service only. For all V8 engines with roller camshafts. See Note #1.

12480002

Hydraulic Roller (LT4 Hot Cam Kit)

I: 2 79
E : 2 8 7

I: 2 18
E : 2 28

"1.6 Rocker"
I: 5 25
E : 5 25

Zero/Zero

1 1 2

Same as P/N 24502586 except it includes alum. rockers, valve springs and retainers.

12370845

Hydraulic roller design

N/A

I: 2 14
E : 2 2 4

I: 488"
E : 509"

Zero/Zero

1 1 2

Contains eccentric for mechanical fuel pump. Off-road use only.

12370846

Hydraulic roller design

N/A

I: 2 22
E : 2 3 0

I: 509"
E : 528"

Zero/Zero

1 1 2

Contains eccentric for mechanical fuel pump. Off-road use only.

12370847

Hydraulic roller design

N/A

I: 2 34
E : 2 4 2

I: 539"
E : 558"

Zero/Zero

1 1 2

Contains eccentric for mechanical fuel pump. Off-road use only.

Note 1: The LT4 camshaft P/N 24502586 was designed to be used in a number of different engines. Therefore, the following change may need
to be made to allow for correct assembly of the engine: For LT1 and L98 engines 1995 and before, the dowel pin in the end of the camshaft
must be pushed in so extension from end of cam is .30 +/–.01" , the same as the production part. For 1996 LT1 and LT4 engines, the dowel
pin is in the correct position, extending .620" from end of camshaft. This camshaft has a fuel pump lobe.

Note 2: Distributor P/N 1104067 or melonized distributor gear P/N 10456413 must be used on all crate engines with steel camshafts.