From: tonygull (tonygull@ozemail.com.au)
Date: Sat Jun 01 2002 - 23:56:20 PDT
Hi,
I have partially dismantled the GMC 270 engine I accquired,( with
the Canadian exhaust manifold).
Unfortunately, the bores are slightly pitted from water ingress.Also wasps
had made nests...I think .020" overbore pistons would be OK.
It seems to me this engine has cylinder bore sleeves fitted.
Is this the norm?
Had metallic green, over bright red, over OD paint...sure was hard to get
off,
I think they used heaps of lead in paint back then.
As to origins of 6*6 vehicles, from 'GMC..Universal Truck' by Boniface and
Jeudy
states
6*6 were rare before 1939, mainly built by specialists such as
Marmon-Herrington.
Quartermaster sought prototypes during 1939
from GMC, Mack, Studebaker, IHC etc, for projected war use.
It also states that the 2.5 ton models used off-the-shelf components
such as Clark 5speed, GMC 270, Timken axles AND Timken T79 TRANSFER CASE.
(that is why so many got made, over 800,000...compared to 25,000 trcks
of any larger size, apparently.)
So my question is, On what was the Timken T79 TX case used if 6*6 were
not already in manafacture prior to that?..it is 3axle TX case.
Maybe they only commenced it in 1938?
Also the ACKW was a civilian model 6*6 built by GM from 1938??
I am not sure here...I think that the GMC 6*6 (ACKWX, CCKW etc)
were based on the civvy models.
Can anyone state what the exact chronology is?
tony
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