Originally Posted by jorb
Thanks For the Presentation Pre '68 Dave
Very informative.

Just curious are you related to ChevroLEE as in Lee Folsom

At one time they had some data on the pugetsoundvintagechevrolet.org website that was complied by Lee Folsom.
The data was about Parts Identification of all Chevrolet torque tubes including part numbers, dimensions of propeller shafts, torque tubes, bushings etc.
To bad they took down that data. It was some good stuff.

The website victorylibrary.com where your Presentation is located at also has a interesting article about Powerglide engine intake valves.
I did not know they increase the size of the intake valves buy 1/16 of a inch to compensate for the power lost in the torque converter.
You can read the article Powerglide intake valves for the Chevrolet “Stovebolt” 235 and 261 engines
The larger intake valves improves peak power.

What do they mean ?, "Minor bowl enlargement for best results"

What the article refers to as "minor bowl enlargement..." is blending and slightly enlarging the pocket in the head behind the valve seat. That would amount to a very small cleanup of the pocket to improve flow.

Nice presentation on the subtle engine differences!


1947 2nd-Series GMC FC152 3/4-ton
Follow the story in the DITY

1953 Chevy Bel Air Sport Coupe Powerglide