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Attached are pages from the 1974 Delco Air Cond parts catalog. Two pulleys show up for use on the big block Buicks. The regular one is Delco 15-224 (GM 6550750) which has a 5" nominal dia. The large...

Heavy duty springs were originally supplied for firm handling, carrying heavy loads, or pulling a trailer.

Here is an old post where an owner found the original Buick part number on a 215 piston.

https://www.teambuick.com/forums/showthread.php?22338-1962-Buick-Special-Deluxe-Convertible

The original...

The passenger side remote control mirror was first available as an option on the '74 full-size Buicks according to the dealer brochures and parts list. The mirror control knob was brought out to a...

Eddy,
The JM code indicates the engine is a Fireball Aluminum V8 from a '63 Special. It had 9.0 compression ratio, 155 HP, 2 bbl carb.

The more powerful '63 Skylark Aluminum V8 was standard on...

The buickgod page is correct regarding the Y engine code (there are several errors on other items however).

The '76 Buick Chassis Service Manual was printed without updating the 455 code from T...

To chime in here behind Bob K Mando, the closest match would be a 3800 series II SFI L36 engine from a '95-02 Firebird or Camaro. That one uses the 4L60E electronic version automatic.

The '95...

The '57 shop manual is light on data concerning the ball joints. Attached is a 1961 dealer service bulletin which indicates the '57-61 ball joints have the same basic design even though parts are...

It was posted one Thursday since around Thanksgiving. Then someone else issued one reply. Then post turned up missing the next morning. There was no notation of a post deletion like usually appears....

The new battery and alternator should work fine together. The challenge for the alternator is to produce enough amps to power engine, lights, and all accessories with a little left over for battery...

Sorry, without the part no, I did not drill down far enough in Google to find the original Roto-Safe type. Here is one item that dates to 1962 going by the box:
...

The part no is 588624 which was used on '64-65 Special/Skylark and '64-65 Olds F85/Cutlass. Buick calls it a front fender skirt while Olds calls it a filler plate. No one seems to be reproducing...

Attached is the spec page on the R89S from a 1977 Delco battery catalog. The C89 was the original maintenance-free side terminal battery used on '71-75 models. The 89-5 Freedom Battery succeeded it...

My guess for the date code is something totally different. Based on other '64 ST300 bulletins, day 001 was some day (which we may never know) in the summer of '63 when ST300 production began.
...

If you're running a 12V coil that requires an external resistor, the coils may be failing if the resistor is not in the circuit. After the engine starts, voltage at the coil should drop to about...

The GEN light depends on the original regulator to give proper indication. The regulator can be reinstalled for partial operation to get light working as before. Another way to monitor alternator...

Here's the dealer service bulletin from 9/23/63 for '64 transmission code number identification.

See the attached 2 pages from the 1957 Buick Product School Manual describing the new combined oil/vacuum pump used in '57 and 58. The part number for the pumps and screen is 1175268 as Bob notes...

The AC RC-15 cap (then aka GM 3886273) was supplied originally for your car.

The AC RC-26 (6410206) was a 15 psi cap used on aluminum radiators or aluminum pressurized expansion tanks. It was...

Problems with excessive casting flash occasionally created warranty problems for Buick. Attached are pictures from three dealer service bulletins on '55 models. Overheating problems were created by...

Glad it was an easy one to solve.

The dimensions of the cores are shown in the '42 shop manual (copy attached). According to the '46 shop manual supplement, '46 models used the same radiators as in '42.

A 1948 dealer service...

The connection for the clock light is made at the bottom terminal of the instrument light switch (upper left position in center of dash) not at the main light switch shown in fig 12-47. The clock...

A regulator designed for use with a generator most likely will not be compatible with an alternator. The place to start building the new system and adding or deleting components will be the...

1960 Buicks came with a standard 35 Amp generator no 1102181 or 1102302 along with a 35 Amp regulator. Cars with A/C or provisions for future A/C came with a 45 Amp heavy duty generator no 1102197...