Extreme jealousy wants me to give you the bird……..
It was almost a perfect day for viewing cars. First thing in the a.m. when the botanical gardens opened, the weather was cool, and as it warmed up a bit, it was a great time to attend the AACA meet.
Some pics, my favorite car of the meet, a 1935 Riley 4 cyl., built for racing. This is owned by a famous local attorney, who has a fantastic collection of vintage cars. Pay no attention to the palms providing shade for the exhibitors and the attendees.

The Jaeger instruments, with their contra-rotating slim needles for the tachometer and the speedometer, appear to be identical to those of my brother's Jaguar XK-120 roadster. Dig those spoked wheels!

Take a look at the front of the engine (to the left) and see the bare aluminum casting, and the chrome-steel large-diameter tube curving up and over the casting, where it ends in a square flange. Behind the chrome pipe you can see the multiple closely-spaced fasteners so-common on British machinery. Now what do you suppose that is?

This picture of the opposite side of the engine may offer clues as to the purpose of that bit of kit.

Note the SU carburetor behind the mesh air filter. The black tubing on this side has something to do with the cast-aluminum, bolted-together machinery and that chrome tube on the left side of the engine.
There were many other cars on display, mostly post WW II, but there was a good representation of between-wars automobiles also.
Porter Cable became Rockwell around 1960 when Porter Cable was purchased by Rockwell International.
In 1981 Pentair purchased Rockwell’s power tool division, and the tools were rebranded to Porter Cable.
Some tool models survived both rebrandings.
Thanks for the specifics.