LARRY70GS

Depends on the car you have, and year.

Probably 3/4". Maybe this, https://www.summitracing.com/parts/sum-g3418

Car is sold.

ttt

Car has rust/rot issues underneath. It's bad enough that I would not sell this car without disclosing it. Despite that, the car still runs and drives great at 212,000 miles. The body was repainted approximately 5 years ago. All the body panels on this car are straight and nice. Has cold A/C, a nice dash kit installed. Driver's seat has some rips, but interior otherwise nice. Interior lighting converted to LED. The optional chrome wheels with Cooper CS-5 Touring tires with plenty of meat on them. It's such a shame because this car has served me well, and doesn't owe me a thing. I would drive it forever if not for the frame rot. I am asking for 1500.00 as is. I'll probably drive it down to Morgantown for a day.

Looks like the site is back up. https://65gs.com/

https://www.v8buick.com/index.php?threads/black-screen-on-65gs-com.383727/#post-3371931

The exhaust crossover ports are blocked off with screw in plugs in that photo. Their function is to heat the corresponding passageway under the intake to help with fuel vaporization in cold weather. A hotter intake though can hurt performance and make vapor lock more likely in hot weather. Blocking the passageways in the heads results in a cooler intake and better performance at the expense of cold weather operation during warm up. It also makes the stock choke inoperable because the exhaust crossover also heats the pocket in the intake that operates the thermostatic choke coil. The smaller holes for each cylinder are for the Air Injection Reactor ports. Air from an air pump is injected into the exhaust to continue the combustion process for lower emissions. On the 72 intakes, there is a passageway on each side for the AIR pump. Those holes in the head can be plugged with cup plugs or screw in plugs. See page 67-8 in the 1972 Buick Chassis Manual, https://www.teambuick.com/reference/library/72_chassis/files/67-a.php https://www.v8buick.com/index.php?threads/a-i-r-heads.380626/#post-3336052

What car is this? Your signature says 65 Riviera 425. Isn't the Nailhead oil pump inside the pan?

Have you tried to contact Richard Clark? http://richardclarksgarage.com/

I don't believe aftermarket gears are noisy. It all comes down to whether the installation is proper. I have Yukon 3.73's in my car and they are silent.

https://www.ebay.com/itm/332647312596?hash=item4d73532cd4%3Ag%3A4fUAAOSwrBRa89oV&fits=Year%3A1965|Model%3ASkylark|Make%3ABuick https://www.v8buick.com/index.php?threads/64-65-skylark-gran-sport-and-special-reproduction-lenses-gaskets.315372/ https://forums.aaca.org/topic/284610-64-65-skylark-gs-new-repro-parking-lenses-reverse-lenses-gaskets/

Goodmark seems to make a variety of springs, https://www.summitracing.com/search/part-type/hood-springs/product-line/goodmark-hood-hinge-springs I suggest you call them, https://www.goodmarkindustries.com/csearch.aspx?CategoryID=0&ManufacturerID=0&SectionID=0&PriceRange=0&SortBy=1&PageSize=12&AndOr=AND&DisplayMode=Grid&Search=hood springs

You mean the Emu.😂

I think that is what Duane calls a cheat sheet, https://www.v8buick.com/index.php?threads/build-sheet.351338/#post-2995210