[Healeys] External differences of six cylinder engines

Josef.Eckert at t-systems.com Josef.Eckert at t-systems.com
Sun Jun 6 01:37:27 MDT 2010

As far as can tell, the 26D blocks are all the same. The 29D block is
different in the casting (more strengthening) and the engine number is as far
as I recollect higher and more to the front on the block than on the 26D
blocks. On 26D engines it was 6 inches back from the front, on 29D engines
only 2 inches.
A picture of ther engine number tag of a 29D block you will find in Ditlev
Clausager`s book "Original Austin-Healey" on page 89.

Josef Eckert

-----Urspr|ngliche Nachricht-----
Von: healeys-bounces at autox.team.net [mailto:healeys-bounces at autox.team.net] Im
Auftrag von Derek Job
Gesendet: Sonntag, 6. Juni 2010 08:13
An: Chris Dimmock
Cc: Forum
Betreff: Re: [Healeys] External differences of six cylinder engines

Thanks for the comments everyone. I probably should have been more specific.

Im looking at a very early Longbridge 100-Six which would have had an IC
engine and the integral manifold. As is common, the old head has been replaced
with a 12 port head and HS6 carbs. (Actually the carbs should be HD6's but
that's another issue)

The current owner believes that during a very extensive restoration in 1992
the previous owner installed a replacement engine block. There is no ID tag on
the engine, so I'm trying to visually determine whether the current block is a
replacement IC, or the newer 26 D, or even possibly a 29D.


On Sun, Jun 6, 2010 at 4:17 AM, Chris Dimmock <austin.healey at gmail.com>wrote:

> The cylinder heads are the giveaway. ;-) The log head is the early
> 100/6 The pre BJ8 12 port head is different to the BJ8 12 port head
> casting - different casting number, and a distinct difference around
> the thermostat area - look at the sculpting of the head casting In 3
> litre blocks there are 2 castings. Pre bj8 blocks have the dipstick
> low on the block. BJ8s have a high mounted dipstick Obviously, the
> same general guidelines applies to sedans of the same era.
> Eg a 1966 Wolseley has the same block/ head casting as a BJ8. But many
> sedans had the starter motor on the opposite side to a Healey. Ie
> different rear engine plate.
> Chris
> www.myaustinhealey.com
> Sent from my iPhone
> On 05/06/2010, at 10:44 PM, Derek Job <derek.c.job at gmail.com> wrote:
>   Hi guys
>> Are there any external differences between the six cylinder engines
>> that would allow you to identify one as being either
>> an IC  (100-Six, Integral head)
>> or 26 D (100-Six, six port inlet)
>> or 29D (3000)
>> thanks
>> Derek

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