Hey datto fans,,

I just bought an A14 to rebuild for my ute and have a couple of questions relating to what type it is.The block has H72 and 28X23A01 stamped on it and the head is an H75 and the exhaust manifold has H82 stamped on it.
Cheers
Shero

H72 is the 80hp block
H75 head is std A14 head...In my opinion just as good as H89

* H72 is the first block which has "A14" cast above the fuel pump boss
* G34 is the second block (shared with the A15)
Both blocks were used in 80HP and 65HP engines. The head and camshaft was the key difference. See Block Comparison for more details.

H72 should be a casting mark rather than a stamped mark. Where do you see 28X23A01 ? Can you post a picture?

H75 head should also have another casting mark on the other end, three digits - which one does yours have? If yours is an open-chamber design, it will make slightly less power than an H89 closed-chamber head.

H82 exhaust manifold - this is the 3-stud outlet manifold, mated to the intake manifold (heat-riser type).



The other type of A14 exhaust manifold is the divorced-manifold -- not bolted to the intake manifold (used with a water-heated intake manifold).



H82 manifold matches the H75 head which has no water ports for a water-heated inlet manifold.

DD the head has 603 on it and the 28X23A01 is cast into the block on the left hand side just behind the engine mount. I'll and post a pic for you to take a look at. What does the 603 mean?

Pic

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And apologies DD the numbers are cast not stamped.

H75 603 is the common H75 casting. I don't know what the numbers indicate. keep in mind that H75 may be machined different ways from the factory, even the ports and combustion chambers may have different shapes. However all the H75 we've inspected have been Oval Port, Open Chamber.

28X23A01 -- I've never noticed that before.

Here's another H72 block
29O27A03 (or 29027A03?)



Maybe a manufacture code (28X23 vs 29O27)?

A01 vs A03 looks like a revision number.

By the way, H72 is the Applied Model Code for 1975 HB210 (first Application of A14 engine). H72 blocks were used through 1979.