Engine block

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Cylinder Blocks

• 11010-H2300 A12 BARE BLOCK 73mm/2.87" bore size
• 11010-H9960 A12A BARE BLOCK 75mm/2.95" bore size
• 11010-H6200 [1974] A13 BARE BLOCK 73mm/2.87" bore size
• 11010-H9700 A14/A15 BARE BLOCK 76mm/2.99" bore size

Crankshafts

• 12200-H8515 A12/A12A CRANKSHAFT 70mm/2.76" stroke
• 12200-H5720 A12 COMPETITION CRANKSHAFT 70mm/2.76" stroke
• 12200-H8915 A13/A14 CRANKSHAFT 77mm/3.03" stroke
• 12200-G3400 A15 CRANKSHAFT 82mm/3.23" stroke

MAIN BEARING (#1/#5, SHELL THICKNESS)
4 each required

• 12215-H2310 .0720"
• 12215-H2311 .0718"
• 12215-H2312 .0715"

MAIN BEARING (#2/#4, SHELL THICKNESS)
4 each required

• 12231-H2310 .0720"
• 12231-H2311 .0718"
• 12231-12312 .0715"

MAIN BEARING (CENTER, SHELL THICKNESS)
2 required

• 12247-H2310 .0720"
• 12247-H2311 .0718"
• 12247-H2312 .0715"

Connecting Rods

4 of each required:

• 12100-H1000 A12 CONNECTING ROD 121.5mm/4.78" center-to-center
• 12100-18500 A12A CONNECTING ROD 121.5mm/4.78" center-to-center
• 12100-16200 [1974] A13 CONNECTING ROD 133mm/5.24" center-to-center
• 12100-17200 A14/A15 CONNECTING ROD 133mm/5.24" center-to-center

ROD BOLT The Datsun rod bolt is a true stretch bolt and should be torqued only once. New bolts should be installed at every disassembly. 8 each required:

• 12109-H1001 CONNECTING ROD BOLT
• 12112-H1000 CONNECTING ROD NUT

CONNECTING ROD BEARINGS The -25720/-H2310 bearing shell produces the most desirable bearing clearance for racing purposes when applied to a standard size crankshaft. The other shells exist in order to obtain proper clearance when compensating for the variations in the crankshaft or connecting rod journals.

8 each required:

• 12111-25720 .0590"
• 12111-25721 .0588"
• 12111-25722 .0585"
• 12111-25723 .0592"
• 12111-25724 .0583"

Pistons

A12 engine came with dished pistons for approximately 9.0:1 compression ration. Standard bore size for the A12 or A13 block is 73mm/2.874".

A12GX engine came with two kinds of pistons:

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

A12/A13 FACTORY CAST FLAT-TOP PISTONS 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".

• 12010-H2361 73MM/2.874" PISTON

PISTON RING SET

[[Ca12033-H6200 RING SET FOR 12010? H2361 1 12010-12364 73.5/2.894" PISTON 4 tegory12035-H6200 RING SET FOR 12010? H2364 1 12010-H2366 74mm/2.913" PISTON 4

Engin12037-H6200 RING SET FOR 12010?

H2366 1 12010-H2310 73MM/2.874" PISTON Similar to 12010-12361 except for valve reliefs for increased piston-to-valve clearance. 4 12033-H6200 RING SET FOR 12010- H2310 e Mechanical]] Summary: