DOHC Heads

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DOHC Heads can be fitted onto A-series Engines.

Nissan AY cylinder head on 1200 block

This is the legendary Nissan 'AY' factory race head on a 1200 block. It's a pushrod/OHV design that features crossflow porting & two plugs per cylinder.

See main article: AY12 engine

GM Vauxhall DOHC head

GM Opel/Daewoo/Vauxhall Ecotech Head [1]

Check this out this is the thread that discussed this subject, it also talks about using a Vauxall head, it has a pic of the Mazda head gasket and some other pics and info on the subject.

Nissan DOHC Head

(GA16 ?)

Nissan DOHC Head

Mazda

Mazda 1300

Mazda 1300 head DOHC on Datsun A15. A kit was made and multiple copies sold. Also SOHC version fits on A14.

See discussion: a15 block mazda head

Mazda B6

Mazda B6: Check this out this is the thread that discussed this subject, it has a pic of the Mazda head gasket and some other pics and info on the subject.

KA24E

OS Giken

E15 SOHC

Will the new E-series heads might fit on the A12 engine? Note that the 1982 E15 engine design is based on the A15 engine:

• Same bore & stroke <li>Same bore pitch (82.5mm - 90mm - 82.5mm) <li>Lighter casting <li>Similar head gasket <li>E15 is overall shorter to fit transverse applications (FWD) <li>Crossflow head with semi-spherical chambers improves on A15: HP and torque are both up 3% <li>The E15 uses a jackshaft "in the area where the camshaft is mounted on the A-series engine" to drive the fuel pump and oil pump (the distributor is driven off the front of the cam) </ul>