Calling Caterpillar Guy...Dodge Siamese Six engines

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I think you referred to a Siamese 6 cyl Dodge engine? I have owned and worked on several Dodge engines 1949 and earlier. What does Siamese refer to?? Thanks!
Dennis M. in W. Tenn.

From DMartin, who says he's worked on old Dodges in the past.

Is this what you guys are talking about?

<img src = "https://macsmotorcitygarage.com/wp-content/uploads/Chrysler-A57-multibank-tank-engine-lead.jpg">

The siamese 6 was the old flat head dodge engines where the cylinders were looking like they were paired if you looked at the head gasket or the spark plugs in the top of the engine. Looking at the engine under the hood the spark plugs would look like you had 3 pairs.

In the water jacket, the cylinders were not totally surrounded by water because they were paired together.

That?s a Chrysler multi bank from an M4A4 Sherman.

I can't see that pic below ? But I wonder if they were talking about the one with two 6cyl blocks making up a v12 ?

(quoted from post at 12:54:27 03/29/19) That?s a Chrysler multi bank from an M4A4 Sherman.

Click to expand...

0 cylinders of tank engine, 5X6.

J Mor ...... from Wikipedia ......

Created in 1941 as America entered World War II, the A57 Multibank engine was born out of the necessity for a rear-mounted tank engine to
be developed and produced, in the shortest time possible, for use in both the 109 examples built of the M3A4 Medium Tank, and the 7,499
examples built of the successor M4A4 Medium tank, each of which had lengthened hulls to accommodate them.

In order to use existing tooling, five Chrysler 250.6 cu in (4.1 L) (bore 3.4375 in or 87 mm, stroke 4.5 in or 114 mm)[1] L-head inline six
cylinder engines were arranged around a central shaft, producing a unique 30-cylinder 21-litre (1,253 cu in)[1] engine in a relatively
compact but heavy package. The crankshafts were fitted with gears, which drove a sun gear arrangement.[2] With iron block and head,[1] it
featured Carter TD-1 carburetors[1] and 6.2:1 compression ratio,[1] for an output of 370 hp (280 kW) at 2400 rpm.[1] It necessitated a
longer hull (same as the M4A6),[3] becoming the M4A4;[3] most of these were supplied to Allied countries under Lend-Lease.[3]

In the February 1944 issue of the magazine Popular Science, an advertisement by Chrysler claimed the A57 could still move the tank it was
fitted in even if 12 out of its 30 cylinders were knocked out.[4]

The M4A4 was largely supplied to the British, the US preferring the M4A3 with the more conventional Ford GAA V8 engine, and restricting
their M4A4s to overseas use.[5]