Andrew,
I went out and looked at my blocks and you are right, the water pump
mounting to the 1953 235 engine is completely different than the 1956 truck.
Well, I also have a 48 one-ton panel with an old 58-62 235 engine (casting
3769716) in it. The water pump is mounted just like the 1956 235, but since it
fits in the 48 panel it is shorter. It has a GM part number on it if someone
can look it up, we may have another alternative. The part number is 3736587.
>From the block to the pulley is 4 inches where on the 1956 engine it is about
5 inches.
Bob Chansler
Mead, CO
P.S. the panel is for sale BTW
-----
Original Message ----
From: Andrew Roberts <arobs@u.washington.edu>
To:
oletrucks@autox.team.net
Cc: mike layton <mlayton64@gmail.com>
Sent: Saturday,
June 28, 2008 9:44:49 AM
Subject: Re: [oletrucks] 235 water pump
Quoting Bob
Chansler <bobchansler@yahoo.com>:
> I found the pumps still listed at
autozone.com. If you go there you
> can see the differences between the
shorter and longer versions. For
> the long version, look for a water pump
for a 56 truck. For the
> short version look for a pump for a 53 Chevy
Belair. The 53 car had
> a 235 with a short pump on it.
That's all true, but
the pump from a '54 or older will not bolt to a
'55 or newer 235. The 848
head is indicative of a newer engine, although
a newer head could be bolted
to a older block and the 848 head is a
popular performance mod for the
earlier 235 and 261. In all likelihood,
this is a '55 or newer block, but
one shouldn't rely on the cylinder head
to determine what year it is.
If
this is a '55 or newer block, the four water pump mounting bolts will
be
spaced radially about 90 degrees apart and the original long shaft
pump will
not fit in an AD body unless the radiator has been moved
forward or the
engine aft. In this case a special short-shaft pump is
needed and, AFAIK, is
available only through speciality vendors. If
however, this is a
full-pressure '53-54 block, the two upper water pump
retaining bolts will be
further apart than the bottom two and the stock
pump will leave sufficient
clearance between the fan and the radiator.
If you're neither a purist nor
trying to look like one, your water pump's
seals and bearings can last
considerably longer if you don't hang a fan
on it and use an electric fan
instead, or at least use a lighter aluminium
fan. If you are keeping the
stock fan, it's a good idea to have it
magnafluxed to be sure there aren't
any cracks in it. These do fatigue
over time and shooting a fan blade
through the hood won't preserve the
originality of the vehicle either.
Andrew Roberts
1949 3600
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