Cam Specs

Following are Nissan cams specs for L-series engines.

Nissan L-Series Cam Specifications

 Engine

L24

L26

L28 & L28e

L28e

L28et

L28et

L28et

L24e

Head

E31/E88

E88

N42/N47/P79

P79

P90

P90

P90A

N47

Cam Mark

A

C

A

F

B

J

M

E

Date

all

all

< 8/81

> 9/81

< 7/82 (auto)

< 7/82 (man)

>8/82

all

Part #

13001-E4126

N3626

E4126

P7980

P3026

P9580

P9980

S6280

Intake duration

248

256

248

240

240

240

240

240

BTC intake opens

16

20

16

16

12

12

16

22

ABC int closes

52

56

52

44

48

48

44

38

Int center angle

18

18

18

14

18

18

14

8

Exhaust duration

248

256

248

248

248

240

240

240

BBC exh opens

54

58

54

58

54

52

54

54

ATC exh closes

14

18

14

10

14

8

6

6

Exh center angle

20

20

20

24

20

22

24

24

Lobe centers

109

109

109

109

109

110

109

106

Cam lift intake

7.35

7

7.35

7

7

7

6.75

7

Cam lift exh

 7.35

7.35

7.35

7.35

7.35

7

6.7

7

Valve lift int

10.5

10.0

10.5

10.0

10.0

10.0

9.6

10.0

Valve lift exh

10.4

10.4

10.4

10.4

10.4

9.9

9.5

9.9

  
  Note: All timings are in degrees and lifts are in millimeters.


The grind stamp is located at the firewall end of a Nissan cam. This one is a "C" grind from a 1974 260z L26 motor

From Zcar.com's Z240zdude:
The "C" stamp cam is a Nismo cam, It is listed as a "high performance cam". The Nissan part # is13001-N3626. The lift and duration is:.434"/256 degrees:

 

Yup, Nissan cams are made from tough cast metal! Look at these:


Before (Cam sat in junk yard for further year after this photo was taken!)

After (No lobe wear)

Aftermarket cams:

Isky

Crane  

Schneider

Part Number Grind Number Int. Duration 
(Gross)		 Exh. Duration 
(Gross)		 Int. Duration 
(.050")		 Exh. Duration 
(.050")		 Int. Valve Lift Exh. Valve Lift Lobe Separation Int. Valve Lash Exh. Valve Lash Matching Component Kit MSRP
nissan C 256 256     .394 .409 109 .010 0.12    
17030
260F
260
260
226
226
.460
.460
107
.008
.010
49003
$195
17032
260-70F
260
270
226
232
.460
.460
107
.008
.010
49003
$195
17033
274F
274
274
234
234
.480
.480
107
.008
.010
49003
$195
17034
270-80F
270
280
232
240
.460
.460
107
.010
.010
49003
$195
17035
284-94F
284
294
240
244
.480
.480
107
.010
.012
49003
$195
17036
290F
290
290
250
250
.495
.495
106
.008
.010
49003
$195
17038
300F
300
300
256
256
.560
.560
106
.010
.012
49003
$195
17040
314F
314
314
268
268
.592
.592
106
.010
.012
$195
17039
311F
304
318
 
 
.620
.624
104
.008
.010
$195

Comp Cams

Regrinds

FYI

Author: The Z Doctor 
Date:   Aug 6, 12:38pm

If cam has  "CWC" lettering, use stock valve springs, or you will trash the lobes. 
The CWC casting does not have the correct metallurgy to run the comp springs.
 If you want to run "comp" springs, get a reputable re-grinder (such as ISKY) to regrind a cam for you......one that has "JAPAN" cast onto it

Author: WangsMan 
Date:   Aug 19, 8:27am

The crane springs and retainers are very nice! Get the spring and retainers from Summit racing for 145.00 or buy them from British Victoria for 230.00.
I just installed a set last weekend and I'm very happy with them. You will need an air compressor and a datsun valve spring compressor to do the job with the head on the block.
The springs can handle over 0.500 lift and stack at 0.600+. Plus they not overly sfiff like the schnider springs.
Make sure to also buy the retainers! Very important to use the crane retainers with the crane springs.
The retainers have a deeper lash pad hole to handle the thicker lash pads. If thick lash pads are used with stock retainers then the engine will sound like a diesel.
And the crane retainer raises the installed height by 0.050" to allow more lift before the retainer hits the oil seal.

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