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The engine cylinder block changed for the 1974 model year. Early A-series Datsun engines (1966-1973) feature a front-distributor design. The A Engine Redesign of 1973 moved the distributor back to mid-engine, and moved the motor mounts back 35 mm.

1 Overview
2 Block Oiling
- 2.1 Head Oiling
- 2.2 Pickup
3 Dimensions
- 3.1 Tall Block
4 A10
5 A12 Original
6 A12 GX
7 A12 from 1974
- 7.1 M2 Block
- 7.2 M79
8 1974 A13
9 A14
10 A15
11 A12A

Overview

B10 A10 Engine
 * no Breather Tube at rear of block
 album

B110 A12 Engine
 * only two accessory bolt bosses on left side
 post

1974-up A12/A13 (short deck engines)
* Many accessory bolt bosses
 full

1974-up A13/A14/A15 (tall deck engines)
* Evenly-spaced Welch Plugs
 album

Early A12
 album

Block Oiling

Head Oiling

Early blocks have oil coming up through the head gasket to the cylinder head. 1974-up blocks have this hole plugged, and instead the oil comes up the center head bolt hole.

Brass plug in Late block

Pickup

Oil Pickup Location & Dipstick

changes

Dimensions

A10 Deck Height: 179.1mm 
A12/A13/A12A Deck Height: 189.1mm 
A14/A15 Deck Height: 204.1mm
Length (all): 393-394 mm block proper (less timing cover)

Tall Block

A14/A15 tall block engines have a Deck height of 204.1mm, or 15mm taller than an A12/A12A block. Length is the same.

11010-H6200 [1974] A13 BARE BLOCK 73mm/2.87" bore size
A14 cast "A14" above fuel pump
- H72 or G30
11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size
- G34

A10

B10 Sunny "Datsun 1000" came with A10 engine, 998 cc, 3-main bearing block. All other engines except A10 have 5-main bearings.

JDM Catalog
11010-18000 ALL Except Coupe
* uses 13035-18000 ASSY-COVER TIMING CHAIN
11010-18001 from E/# A10-184228 
* uses 13035-18001 ASSY-COVER TIMING CHAIN < 13035-H1000 from 0570
 [updated to Double timing chain & pressure tensioner]  
 [Fits all B10 blocks]
11010-25700 Coupe

Some B10 was fitted with NIKKI carburetor.

A12 Original

H10 block castings 

11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size
* USA 11010-H2300 0570- ALL <> 11010-H1000
* USA 11010-H1000 -0470
* JPN 11010-H2300 GX, running change replaced <2,0> 11010-H1000
* JPN 11010-H1000 except GX

M08 block from 1970-1973 E10 Nissan Cherry X-1R A12T 

M15 E10 Cherry A12 single-carb

B110 A12 engine, five main bearing (so not interchangeable with A10 engine).

11010-H1000 JDM, USA -0470
- 13035-18001 ASSY-COVER TIMING CHAIN [single mark, pulley has multiple marks]
11010-H2300 GX, USA non-GX from 0570-
- 13035-H1000 ASSY-COVER TIMING CHAIN [multiple marks]
- [chain tensioner and bolts changed 0570]

M08

M08 - Cherry A12T

A12 GX

B110 A12GX Engine block is the same as standard block, except for:

Flat-top pistons
GX camshaft
extra connection on the Suction Pipe

album

A12 from 1974

1974 engine redesign (From October 1973), accessory mounts and engine mounts not compatible with earlier A12 engine.

More bolt holes for more accessories.
Engine mount bosses are 35 mm farther back (in photo, mount is forward, on accessories mounts)

Revised Block

Early Block

Dimension (late engine)
album

B210 JDM

11010-H5000
11010-G1600 From June 1975 (?)
Both use 11110-H5000 PAN ASSY-OIL
Both use 13035-H1000 COVER-timing chain
Both use 11110-H5000 PAN ASSY-OIL

B120 JDM (from Oct 1975)

11010-G1600 7510-7907
11010-G1618 7908-8503
- 11110-H5000 PAN ASSY-OIL 7510-8503
11010-G1619 8504-
- 11110-G3401 PAN ASSY-OIL 8504-8910
- All use 13035-H1000 Timing Chain Cover
- 11110-H9701 PAN ASSY-OIL 8910-

B310 JDM

11010-H5000 Van -7909
11010-H9460 Van 7910-8010
11010-H8500 Sedan, Coupe -8010
11010-H9463 Van 8011-8109, 8110-
All use 11110-H5000 PAN ASSY-OIL
All use 13035-H1000 or 13035-H1010 COVER-timing chain

H50

H10 A12 B110 etc.
H72 A14 B210 etc. rear wheel drive
M72 A14 N10 Front wheel drive
H85 - B310 A12
H86 - A12A/A13

#M79 - A12

A12

No drain plug (undrilled boss)
Single drain plug
Dual drain plugs (M22? casting number)

G32?

New A12 has offset center core plug (same as original A12), but with two drain plug bosses.

A14 has re-spaced center core plug and single drain plug boss

M2 Block

A12 block with a large 'M2' cast mark on left side

L-series, Z-series, KA-series and A-series were all available with blocks marked M2. Apparently M2 indicates a factory replacement block.

Also cast 'M22' in the usual place, and cast 'A12' above the fuel pump boss
pic pic pic

A12 M2 block
* Late model design (A Engine Redesign)
* Twin drain plugs on left side
* Late model scalloped crankshaft
* reportedly has small 25mm welch plugs on left side

M79

* single drain plug casting
* dual drain plug casting

full

1974 A13

USA model B210 came with unique pre-A14 tall block engine. B210 USA uses Mid Sump oil pan.

11010-H6200 [1974] A13 BARE BLOCK 73mm/2.87" bore size
- 11110-H6200 ASSY-PAN OIL
- 11110-H7200 ASSY-PAN OIL FOR SERVICE
- 11110-H7201 ASSY-PAN OIL FOR SERVICE
- Uses 13035-H1000 Timing Chain Cover

A14

USA B210
11010-H7200 B210 USA 
* B210 USA uses Mid Sump oil pan
* 11110-H6200 ASSY-PAN OIL -0275
* 11110-H7200 ASSY-PAN OIL 0375-0875
* 11110-H7201 ASSY-PAN OIL 0975-
* Uses 13035-H1000 Timing Chain Cover

North American B310
11010-H7200 -0779 USA, -1179 CAN
11010-H9905, 11010-H9900 0879- USA
11010-H9115 1279-0780 CAN
* 11110-H5000 OIL PAN [same as JDM B210 A12/A14]

A14 cast "A14" above fuel pump
H72 Casting mark with "29027A03" cast mark

G34 casting
* A14/A15 block

with "C028X" mark

H72 with "28X23A01" cast mark

A15

North America B310
* 11010-H9700 -0779 [different from A14]
* 11010-H9905 0879- [Shared with A14]
** 11110-H9700 OIL PAN [unique to A15]

Nissan Competition
* 11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size

G34 Casting

G34 cast mark, also "8" and "238193"

A12A

75mm/2.95" bore size

North America B310

11010-H8500 CAN 1278-0779
11010-H8502 CAN
11010-H9001 CAN 0879-
11010-H9960 USA 0879-
- 11110-H5000 OIL PAN

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Block Comparison

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