[Healeys] External differences of six cylinder engines

Derek Job derek.c.job at gmail.com
Sun Jun 6 00:13:05 MDT 2010

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
>> www.healeysix.net
>> ________________

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