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The Datsun 1200 A12 engine came with slightly dished pistons for approximately 9.0:1 compression ratio. Standard bore size for the A10, A12 and early A13 block is 73mm (2.874 in). Pistons are cast for quietness, and lightness. Nissan Competition does not recommend forged pistons for street use as they are not as close tolerance as the cast pistons (forged pistons are noiser due to larger tolerances required). The A12GX engine used the same dished pistons, except for the "high gas" version which used flattop pistons from the Datsun 1000 Coupe motor.

1 GX Pistons
2 Piston Comparisons/Potential Swaps
3 Forged Pistons
4 Suppliers
5 Part Numbers
6 Specifications
7 Rings
- 7.1 Interchange

GX Pistons

A12GX Engine came with two kinds of pistons:

dished for low-gas (regular octane) engine
flat-top for high-gas (high octane) engine

Piston Comparisons/Potential Swaps

Justy Piston Swap

A14 Cosworth pistons

A14 76mm Piston

A14 76.85mm Tomei Piston

A15 Piston (small dish - early A15)

A15 Pistons (late A15 H98 quench type vs round-port A15)

A14 79mm from Matsuoka

Forged Pistons

The downside of forged pistons is noise and wear. But they do hold up to massive stress, so good for turbocharged engines or high-RPM racing engine.

1984 Nissan Competition Catalog

Nissan Competition does not recommend forged pistons for street use.

ARIAS FORGED RACING PISTONS
All of the forged pistons are of the dome-top design. Modifications must be made to the spark plug side of the combustion chamber for proper clearance. The compression ratio will vary depending on the swept volume of the engine and amount of material removed from the cylinder head. Piston-to-wall clearance for forged pistons should be approximately.005" to .007". All forged pistons use a full-floating .750" pin retained by Teflon buttons. For this reason the A12 and A12A pistons require the use of the A12A connecting rod (12100-98500). Also, the A13 and A14 pistons require the use of the A14 connecting rod (12100-H7200). Because of the full-floating pin the small end of the rod should be sized with a clearance of .0006" to .0009". End gap for the top ring should be .012" to .015". The second ring should have an end gap of .010" to .013". Clearance on the oil scraper ring is not critical. Forged pistons are not recommended for street use

ARIAS forged pistons a12 +040 with floating pins, teflon buttons

Arias forged pistons with press wrist pins and rings $175 each (2008)

Suppliers

Datrats (Australia) is listing A14 oversize Tomei forged pistons
JE Pistons -- custom order
JP Pistons (Australia) -- custom order pistons
Malvern Racing
JE and Wiseco forged pistons
HP engineering (Rhode Island). Phone 401-789-6700
A12 std. Cosworth race pistons with pins (19mm)
A12 +0.040 Cosworth race pistons with pins (17mm).
Nissan Competition no longer carries these.
Nissan
76mm race pistons sold by Nissan under the number 12010-A14STD. These are used in the A12A engine when it is bored close to its maximum +0.040 inch overbore.
PAECO These folke are real nice people lots of A-series goodies, custom order pistons, and a great price for the hi perf valve spring, pushrod and lifters, and some nice cam grinds .You can request a catalog via E-mail. Custom order $460/set
Peter Zekert - click to see current available pistons
Ross Racing pistons (California) $359 without wrist pins and domed for $391 also sans pins
Wiseco
Venolia (part number 10400 for standard pistons, $67 each in 2008). They told me on the phone a while back that they would make me any piston I wanted for about $86.00 each but they may be more by now

PISTON RINGS

Total Seal premium piston rings
Page 38 of the catalog has the A14 and A12A piston rings listed
These can be bought from many parts stores

A12A +0.040" over (1.0 mm oversize) is the same as stock A14 pistons

Part Numbers

12010 Piston with Pin
12033 Ring Set

1200

See Piston, Crank & Rod Part Numbers

12010-H1001/H1011 PISTON SET-with pin A12 regular, A12 GX-low
12010-18021/H2301 PISTON SET-with pin A12 GX-high
12033-B3040 RING SET-piston A12 all

SET-RING PISTON STD - 73mm bore
12033-H1002
12033-B3040 ^12033-H1002

ITM Part # 51283.STD RPB Standard size Alternate # 021-1335

Interchange: 
* B110 1970-1973
* B210 1974 A13
* 410, 411 Sedan & Wagon, 1200cc, 1300cc 1964-1968
* 520, 521 J13 Pick-up Truck, 1300cc 1965-1969
** Replaces Nissan 12033-H6200, 12033-19100, 12033-B3040

SET-PISTON WITH PIN STD (Source: USA catalog)
12010-H1001
12010-H1011 0672- ^12010-H1001

Nissan Competition Parts

NOTE: 99996- part numbers are Nissan Competition

A12/A13 FACTORY CAST FLAT-TOP PISTONS
12010-H2361	73MM/2.874" PISTON
12010-12364 73.5/2.894" PISTON
12010-H2366 74mm/2.913" PISTON
12010-H2310 73MM/2.874" PISTON 
* Similar to 12010-12361 except for valve reliefs 
  for increased piston-to-valve clearance

Cylinder wall thickness should be checked by sonic testing when increasing initial bore size in excess of 1 mm/.03937". Standard bore size for the A12 or A13 block is 73mm/2.874".

PISTON RING SET
12033-H6200 RING SET FOR 12010-H2361 STD
12033-H6200 RING SET FOR 12010-H2310 STD
12035-H6200 RING SET FOR 12010-H2364 +0.5
12037-H6200 RING SET FOR 12010-H2366 +1.0

ARIAS FORGED RACING PISTONS
All of the forged pistons are of the dome-top design. Modifications must be made to the spark plug side of the combustion chamber for proper clearance. The compression ratio will vary depending on the swept volume of the engine and amount of material removed from the cylinder head. Piston-to-wall clearance for forged pistons should be approximately.005" to .007". All forged pistons use a full-floating .750" pin retained by Teflon buttons. For this reason the A12 and A12A pistons require the use of the A12A connecting rod (12100-98500). Also, the A13 and A14 pistons require the use of the A14 connecting rod (12100-H7200). Because of the full-floating pin the small end of the rod should be sized with a clearance of .0006" to .0009". End gap for the top ring should be .012" to .015". The second ring should have an end gap of .010" to .013". Clearance on the oil scraper ring is not critical. Forged pistons are not recommended for street use.

PART NO. DESCRIPTION QTY REQ. 
99996-H1017 73MM/2.874" A12/A13 PISTON 4
 99996-H1027 RING SET FOR 99996-H1017 1
 99996-H1022 REPLACEMENT PIN FOR 99996-H1017	4
 99996-H1123 REPLACEMENT BUTTON FOR 99996-H1017 8

99996-H1011 74MM/2.913" A12/A13 PISTON	4
 99996-H1021 RING SET FOR 99996-H1011	1
 99996-H1022 REPLACEMENT PIN FOR 99996-H1011	4
 99996-H1127 REPLACEMENT BUTTON FOR 99996-H1011 8

99996-H1060 76MM/2.992" A12A/A14 PISTON 	4
 99996-H1065 RING SET FOR 99996-H1060 1
 99996-H1022 REPLACEMENT PIN FOR 99996-H1060 4
 99996-H1124 REPLACEMENT BUTTON FOR 99996-H1060 1

99996-H1061 76.75MM/3.022" A14 PISTON 	4
 99996-H1067 RING SET FOR 99996-H1061
 * This ring set is designed for 77mm/3.032" pistons, 
   therefore, some sizing will be necessary to achieve 
   the proper end gap.
 99996-H1022 REPLACEMENT PIN FOR 99996-H1061 4
 99996-H1023 REPLACEMENT BUTTON FOR 99996-H1061 	8

99996-H1062 77MM/3.032" A14 PISTON	4
 99996-H1067 RING SET FOR 99996-H1062	1
 99996-H1022 REPLACEMENT PIN FOR 99996-H1062	4
 99996-H1126 REPLACEMENT BUTTON FOR 99996-H1062 	8

COSWORTH FORGED RACING PISTONS
The only exception to the information provided in the above paragraph <for Arias pistons> is that the Cosworth piston still utilizes circlips to retain the full floating piston pin.

PART NO.	DESCRIPTION	QTY REQ 
99996-H1170 76MM/2.992" A12A/A14 PISTON	4
99996-H1175 RING SET FOR 99996-H1170	1

Other A12

B310 JPN 
12010-H1061 Van

C20 Vanette
12010-18011 [flattop]
12010-18021 > 12010-18011

A12A

A12A 75mm bore 1237cc

B310 JPN (S,K "A12", replaced by A13 8011)
12010-H8511 JPN -7901 <2,0> 12010-H8521
12010-H8521 JPN 7910-8010

12010-H9012 USA 0879-0780,CAN ALL YEARS <> 12010-H9022 <> 12010-H9001
12010-H9502 USA 0880- <> 12010-H9512

A13

12010-H8661 B310 JPN

A14

Factory A14 pistons came in several versions with differing piston dishes.

5.37 mm dish (H72)
12010-H7284 STD
12010-H7286 0.5 OVERSIZE
12010-H7288 1.0 OVERSIZE
* STD GFU EARLY 1276-0777
* STD CAN 0877-

JAPAN B210 (H75)
* 12010-H7511

4.08 mm dish (H76)
12010-H7684 STD
12010-H7686 0.5 OVERSIZE
12010-H7688 1.0 OVERSIZE
* STD GFU LATE 0877-

Offset Dish (H87)
* 12010-H8702 A14 B310 FED 0880-

USA B210 A14 (See A-series Engine Changes)
SET-PISTON WITH PIN
NON-GFU EXCEPT CAN 1978
12010-H7211 STD <> 12010-H7711 <> Sealed Power 12158P
12010-H7214 0.5 OVERSIZE <> 12010-H7714
12010-H7216 1.0 OVERSIZE <> 12010-H7716
* H721x B210 -0977
*       F10
* H771x B210 1077- <> 12010-H7211 <> Sealed Power 12146P

B310 USA
12010-H7284 A14 CAN
12010-H7684 A14 KFU -0779
12010-H7685 A14 FED 0879-0780 <> Sealed Power 12147P
                CAL
12010-H8702 A14 FED 0880-

B310 JPN A14
12010-H7511 V.-7909
12010-H7685 V.7910-
12010-H8911 S,K+AT <2,0> 12010-H8931
12010-H8931 S,K.7910-8010
12010-H9211 A14E -7909 <2,0> 12010-H9221
12010-H9221 A14E 7910-8010

A10 JPN with A14
12010-H7511 -7803, Van 7804-7906 <2,0> 12010-H7685
12010-H7685 Van 7907-
12010-H8911 S,K.7804-7811 <2,0> 12010-H8921
12010-H8921 S,K.7812-7901 <2,0> 12010-H8931
12010-H8931 S,K.7902-

A15

12010-H9718 A15 B310 CAN 0879-

12010-H9704 A15 B310 FED -0779 [centered dish, shallow]

12010-H9714 A15 B310 FED 0879-0780 [centered dish, deep]
                     CAL -9780
                     CAN 0879-
                     150Y 1979-1982

12010-H9802 A15 CAL 0880- [offset dish]

12010-G3421 A15S JPN 8011- [Offset dish]
12010-H9261 A15E JPN 8011- [Offset dish]

Specifications

Piston Pin Diameter x Length  to fit Connecting Rods
A10/A12: 17.45 mm x 65.5 mm
A14/A15/A12A: 19.00 mm x 63 mm

Pin Height (Compression Height)
A10/A12/A13/A14: 32.5 mm
A15: 30 mm

Piston length
A12/A13: 67.40 mm
A14: 67.5 mm
A15: 65.00 mm

Rings

Ring Type
A12/A13, early A14: 2.0 mm, 2.0 mm, 4.0 mm oil
A15/A14 late:       1.2 mm, 2.0 mm, 4.0 mm oil

C20
12033-13201 SET-RING, piston (RIK-VENT)
12033-H1101 (RIK-VENT) > 12033-13201
12033-13203

A10 with A14
12033-H7200 -8003
12033-H9910 8004- <> 12033-H7200

1978-1979 GFU, CAN A15 1979-1980
12033-H7680 SET-RING PISTON STD GFU 0877-
12035-H7680 SET-RING PISTON (0.5 MM OVERSIZE) GFU 0877-
12037-H7680 SET-RING PISTON (1.0 MM OVERSIZE) GFU 0877-

* B210 EXCEPT 1978 GFU
* F10
* B310 USA     -0779 [1979 model year]
* B310 CAN 0879-0880 [1980-1981]
12033-H7200 STD
12035-H7200 0.5 MM OVERSIZE
12037-H7200 1.0 MM OVERSIZE

1980
* B310 0879-0780
12033-H9900 STD <> 12033-H9910

1981-1982 A14/A15
* B310 USA 0880-
* B310 CAN A14
12033-H9800 STD <> 12033-H9810

12033-H8915
* A15 1279-0780

Interchange

A12
MAZDA 1976-1978 
* GLC 1977-1978 L4-1272cc 1.3L 2 BBL Vin TC
* MIZER 1976-1977 L4-1272cc 1.3L 2 BBL Vin TC 
NISSAN/DATSUN 1967-1974 
* B110 1200 1971-1973 
* B210 1974 L4-1288cc 1.3L 2 BBL Vin A13 
* PICKUP 520 1967-1968 L4-1299cc 1.3L 2 BBL Vin J13 
* PICKUP 521 1968-1969 L4-1299cc 1.3L CARB Vin J13

A12A
Standard Size Piston Rings - Cast Iron Rings;  Bore 75mm"; 8-2.0mm Comp and 4-4.0mm Oil Rings. 
* SEALED POWER #E-362X.STD, 9469X.
* Hastings #2M-6813
  Fits:
  * 1979-1982 Datsun/Nissan 210 4 cyl. 1.2L 1237cc A12A engine
  * 1971 & Up Mazda 4 cyl. 1.5L 1484cc UA engine
  * 1968-1969 Toyota Corolla 4 cyl. 1.1L 1077cc KC engine
  * 1969-1979 Toyota Corolla 4 cyl. 1.2L 1166cc 3KC engine
  * 1981-1982 Toyota Starlet 4 cyl. 1.3L 1290cc 4KC engine

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