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Thanks.

The pulley unbolts from the balancer without removal.

Block casting number 25505553 is an 80-84 4.1 block. Scroll to the bottom of the page, https://www.nmr.mgh.harvard.edu/~reese/BuickV6CastingNumbersandInternalSpecs.pdf

The 491295 is just the last 6 digits of the VIN number of the car it came in. The 4 is Buick Motor Division. On the 67 and up V8's, the second character is a number, the last digit of the year of production, BUT, you have an A there, so it must be an earlier engine. The H I believe is the...

On the Ring gear, there are 2 numbers after the part number. Divide the smaller number into the larger number and that gives you the ratio. 45/11 = 4.10

While thicker oils (15W/50, or 20W/50) may offer more viscosity in a hotter running engine in hot weather, it also takes more power to pump, and circulates slower especially while cold. Rule of thumb is to run the thinnest oil that gives you sufficient hot oil pressures. The Nailhead oiling...

This is plastic? https://www.rockauto.com/en/catalog/buick,1966,wildcat,6.6l+401cid+v8,1319262,wiper+&+washer,wiper+arm,8848 https://www.summitracing.com/parts/anc-4103 (says stainless steel)

I use Joe Gibbs oil, https://drivenracingoil.com/c-1389462-shop-by-product-hot-rod-engine-oils.html https://drivenracingoil.com/i-30497803-hr2-10w-30-conventional-hot-rod-oil.html https://www.rockauto.com/en/catalog/buick,1966,wildcat,6.6l+401cid+v8,1319262,engine,oil+filter,5340...

https://forums.aaca.org/topic/276383-fuel-filter-location-on-ac-63/ https://www.nailheadbuick.com/product-page/63-to-66-fuel-filter-bracket https://forums.aaca.org/topic/236530-fuel-hose-routing-on-a-63-401/ Maybe Tom Telesco can help (Telriv)

Looks like it is mounted to the ignition coil, on the smaller engines, and to the thermostat housing bolt on the 401. Is the bracket still there?

Both of your symptoms indicate excessive ignition timing. Hard cranking while hot and surging. If you have the vacuum advance connected, disconnect it and see if the surging stops. Make sure you are referencing the correct mark on the harmonic balancer. Some V6 balancers have two marks, one...

No worries at all with the 64 8.2.

The 8.2 is plenty strong unless you have over 500 HP and are planning on racing the car with slicks.

9 times out of ten, it is dirty/corroded/loose connections at the starter or battery. Probably why it is stalling as well, especially if you are running the original externally regulated alternator.

This is what I use, https://www.gearvendors.com/index.html Probably more than you need, it's good for 1200 HP. You can probably get by with a moderately built TH2004R.

Yeah, I figured it was too good to be true.

Are any of these correct? https://www.rockauto.com/en/catalog/buick,1966,wildcat,6.6l+401cid+v8,1319262,electrical-switch+&+relay,neutral+safety+switch+/+range+sensor,4584

If you have a floor shifter, the neutral safety switch can be located inside the shifter assembly instead of the steering column like pictured. Whenever you have a no crank problem, you should first check the battery, then cables and connections at the battery and starter. After that, check...

The neutral safety switch is frequently located ON the steering column, under the dash. No need to remove the steering wheel. Try this. Attach a length of 14 gauge wire to the + battery post. touch the other end to the small "S" terminal of the starter solenoid. The starter motor should...

High HP blocks need a girdle, more machining and more expense. My engine does not need it at 600 HP, and engine RPM below 6000 RPM.