DOHC Heads
DOHC Heads can be fitted onto A-series Engines. However, nothing is "bolt right up". With all of these DOHC setups you have to reroute oil and water passages, and block some off on the engine casting. All of them take some in-depth work and massaging.
Except for the rare works AY cylinder head.
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 Family I DOHC head
GM Opel/Daewoo/Vauxhall Ecotec Cylinder Head
X16XE head with A-series gasket - lines up almost perfectly
Check this out POST 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.
X16XE head on A-series block
- Bolt holes need widening by about 2mm at the top
- Needs 79mm or bigger pistons. A14/A15 can do this (see Overbore)
X20XE head won't fit. It is for the GM Family II engines, with slightly bigger block dimensions. But you can swap the entire Superboss engine into your 1200.
Nissan DOHC Head
(GA16 ?)
Nissan DOHC Head
Mazda
Mazda 1600
Mazda B6ᵂ DOHC head on Datsun A15. A kit was made and multiple copies sold.
The kit fits on both A15 and A14 (both A14 and A15 have a 76mm cylinder bore and the same deck height).
See discussion: POST a15 block mazda head
at this stage all the kits have been sold. will not be making any more at this time... cheers rob
Mazda B6: Check out POST this thread that discussed this subject, it has a pic of the Mazda head gasket and some other pics and info on the subject.
Mazda B6ᵂ 1.6 liter turbo engine
16-valve DOHC * 1989-1993 Mazda Miata * 1993-1999 Mazda Xedos 6 * 2000-2005 Kia Rio export markets * 1997-2003 Mazda Familia/ Mazda Etude (South Africa)
used Daihatsu Applause flat-top pistons 77mm. The belt is a DAYCO 94616
Mazda SOHC
The "a15 block mazda head" thread was originally referring to the Mazda 1600 DOHC head, which has valves too big for the A12. And if I understood correctly, requires the DOHC pistons (see post 61) which won't work in an A12.
at this stage all the kits have been sold. will not be making any more at this time. sold them to some morris minor owners with a 14s in them. using single cam 8valve cheers rob
Rob has built up an early A12 using the early Mazda B1 and B3 engine with 71mm bores. The A12 has a 73mm bore, so there is plenty of room for the valves.
B1 1.1 liter SOHC 8V engineᵂ * 1987-1989 Mazda 121 * later model Kia Sephia in European and Asian markets * 1991-1995 Mazda 121 fuel-injected (European market)
Mazda B3 SOHCᵂ 8V 1.3 liter 63-73 hp, 73-80 lb-ft * 1988–2000 Ford Festiva/Mazda 121 * 1985–2014 Kia Pride * Autozam Revue/Mazda 121 * 1986-1989 Mazda Familia/323 * 1995-2002 Mazda Demio * 1994-1997 Ford Aspire/Kia Avella * 1987-1989 Ford Laser * 1991-1993 Sao Penza * 2000-2005 Kia Rio
KA24E
OS Giken
TC16 head since 1973 is for the L-series 4-cylinder engine, so good for a PB110 or an L16/L18 swap. It is a 16-valve design.
new version: TC16-CI
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 * Same bore pitch (82.5mm - 90mm - 82.5mm) * Lighter casting * Similar head gasket * E15 is overall shorter to fit transverse applications (FWD)
E15 Crossflow head with semi-spherical chambers improves on A15: HP and torque are both up 3%
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).
Honda
2005 Honda CBR1100XX Super Blackbird head on A14 engine
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