[Chrysler300] 57 Intake question

["Richard Barber" <c300@xxxxxxx>]

I just looked at that '57 300C intake manifold on eBay again and see that
there are some pictures that were either added or I missed them the first
time.  In any case, the casting number is the same as my spare supposedly
'55-'56 intake manifold.  The only visible difference is the previously
noted little oval plate bolted to the top of the manifold on the '57
manifold and, of course, the casting dates (5-6-57) on the eBay manifold and
CWC or CWG on my spare.  The castings may be machined to different
dimensions.

I would be interested in hearing from a '57-'58 300 hemi owner as to what
that little oval plate at the RF top of the manifold is for.  The blanked
off boss lines up with a couple of flat bosses on top of the water
pump--perhaps supports for an a/c compressor??? 

I find these castings to be kind of interesting.  The big chambers on the
bottom of the manifold take exhaust from one side of the block to another
via passages under each carb.  This crossover exhaust flow would be more
intense while the heat riser valve is close or only partially open.
Interested readers might want to read a thread on heat riser valve function
and problems from the Imperial Club website at:

http://www.imperialclub.com/Repair/Exhaust/riser.htm

A contributor to that thread recommends lubing the heat riser valve pins
MONTHLY with the right stuff.  I used to check and lube these heat riser
valves from underneath while doing oil changes/grease jobs.  The proper lube
loosened them up quite well, but they were often stuck.

C-300'ly,
Rich Barber
Brentwood, CA
1955 Chrysler C-300

-----Original Message-----
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Rich Barber
Sent: Tuesday, June 30, 2009 2:18 PM
To: paulholm@xxxxxxxxxxxxx; Chrysler300@xxxxxxxxxxxxxxx
Subject: RE: [Chrysler300] 57 Intake question

The claimed '57 manifold on e-Bay appears to be very similar to the '55-'56
intake manifold with the exception that the little oval plate with two bolts
is just a cast boss on the '55-'56.  That boss may be the base for an a/c
compressor?

The casting number on the bottom of the '55-'56 manifold is 1634285 and
should not be mistaken for a part number.  The parts book shows part number
1731686 for the '55-'56 300 intake (a rather high number for a 1955 part)
and 1733477 for the '57-'58 (non-FI) 300 intake manifold.  Perhaps someone
can furnish a casting number for the '57-'58 manifold so that you can verify
it with the e-Bayer.

I think I have read that the '55-'56 manifolds are not interchangeable with
the '57-'58 manifolds due to differences in the dimensions between the 392
heads and the earlier 331/354 heads.

FYI, the little rectangular depression on the passenger's side of the
manifold is a platform for a stamped steel coil bracket that is fastened to
the adjacent bolts.  There is a threaded boss with something in it in the
e-Bay manifold.  On my 1955, there is a fitting in that boss that provides
access for a vacuum line to the power brake booster.  I have a spare
manifold that came with a temperature probe in that hole, giving rise to the
question that these could be marine manifolds?

C-300'ly,
Rich Barber
Brentwood, CA
1955 Chrysler C-300

-----Original Message-----
From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On
Behalf Of Paul Holmgren
Sent: Tuesday, June 30, 2009 10:47 AM
To: Chrysler300@xxxxxxxxxxxxxxx
Subject: [Chrysler300] 57 Intake question

Does ANYone with a 57 300 have an intake that looks like this one??

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=110408938060

-- 
Paul Holmgren
Mine: 2 57 300-C's in Indy
Hers: 05 PT GT R/T HO
Hoosier Corps L#6


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