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Mike, three different push rod part numbers were used depending on series:

1242280 Series 50 - 1931-35
1256547 Series 60 - 1931-32
1256678 Series 80, 90 - 1931-33 and Series 90 1934-35
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Another idea would be to install a 198 V6. In that way the original Dual Path automatic can be reused. The V6 was not offered on the '63 Skylark, but it was used on some lesser '62-63 Specials.
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1955 was the last year Buick used the lighter-duty select-shift manual transmission (has a 5-bolt top cover). The general design goes back to the '30s, and some parts interchange even with other GM...

Alan,
I think what you were told about the black lid on non-Stage I '73 Rivieras is correct.

The parts list I have threw me a curve by making it look like the '72-73 Chrome E body Air Cleaner &...

The bearing that goes over the pin is Buick part no 1324831 - there are some available here and there on eBay. The bearing consists of two thin steel sleeves with molded rubber filling the space...

The '73 Riviera did come with a chrome air cleaner lid as standard equipment.

There are some fingers on the connector that hold the connector in the transmission case. The fingers have to be compressed from inside the case to free the connector from the case. Here are the...

Buick redesigned the 1957 water pump mid-year by adding an inlet port and hose nipple on the pump neck. The heater core return line hose was then moved from the radiator tank to this new fitting....

The kickdown switch will only do a downshift (3-2 or 2-1) at full throttle. Many TH400 units will do a part-throttle 3-2 downshift at speeds under 33 mph. The part-throttle downshift is done...

The first two digits of the ratio will be stamped on the bottom of the axle housing per Fig. 6-1. Hopefully those numbers are still readable.

Don't know how to determine original engine type...

The parts book went kind of crazy with the abbreviations:
AT = automatic transmission
DOM = domestic
PT = positraction
HP = high performance (meaning 4 bbl carb)
CT = conventional transmission...

Yes.

It looks like the switch-pitch idle stator switch (on throttle linkage up near firewall) is not wired in. Maybe the wiring is just not visible in these pix.

A dealer service bulletin which came out during the '51 model year provides some more detail. All Buick carbs were redesigned to improve stalling tendencies during cool humid conditions. The late '51...

Here's the info out of the shop manual to ID the rear axle. From the parts book is a list of available gear sets.

The '63 models did not have a detent downshift or electrical switch-pitch feature, so no connector was brought out of the harness like on the '65. The '65 harness feed was a second yellow wire...

It probably would work. If it were mine, I would put a dowel in the pump body like the original just to be sure. The gasket at that hole would have an open cavity into the timing chain cover and an...

The deflector is a GM part no 1237121 under Group 8.154. Fits 71-76 full size Buicks. Left and right side are the same.

www.buickfarm.com shows to have one in stock. That one could at least be...

Attached are the pages from the shop manual showing this adjustment. The entire 1966 Chassis Service Manual is available under the Reference! tab.

It's a drain hole and belongs there. Should the rotating seal leak just a tiny amount, maybe 2 drops/day, the coolant runs on out without getting into the bearing.

Yours has been leaking enough...

Yes everything comes out from the top. The only need to work from below is to open the petcock. Attached is the next page from the shop manual on the water pump. The worst that could happen is having...

The parts book isn't any help. It just says mounting hardware items are standard stock. It looks like the two smallest holes at about 11:00 and 5:00 positions are pilot holes for alignment studs in...

There's a complete unrestored unit on eBay now for $450. Will be interesting to see if it sells.

Here's a post from 2014 where a '55-60 Chevrolet plastic 22 tooth gear no 3708699 was used successfully to replace a 1315011.
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Bill,
Here are the pages from the '84 manual for cars with A/C. These instructions are not in the '83 version.

For cars without A/C, the instructions (in a different chapter) are the same for...

Here is a drawing from the shop manual showing the switch mounted on the parking brake control assembly. The wire color is tan with white stripe.