[Healeys] External differences of six cylinder engines

[Josef.Eckert at t-systems.com]

Derek,
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
Konigswinter/Germany

-----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.

Derek
www.healeysix.net

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