RivDad

Randy, Some very good info here... https://www.nailheadbuick.com/post/tips-on-painting-your-engine

It's kind of an oddball but .138 is the ID of 3/16" OD tubing. See here... https://www.polyconn.com/nylon-tubing-3-16-OD

Looks good. Nice job.

Beautiful 1963 right now on Bring a Trailer...https://bringatrailer.com/listing/1963-buick-riviera-32/

To answer your question... no the 425 is not considered a "big block". It is physically the same size as the 401, but with larger displacement. The true Buick "big blocks" began in 1967 and ran through 1976. They were the 400, 430, and 455.

You can follow the build on YouTube. His channel is Montana Kustom Klassics.

Dave I was under the impression the standard wheel medallion only had a single tab around the perimeter. Or was that only the wire wheels? Jeff

Guys, I have these four wheel medallions for sale. I'm not even sure what wheel they fit. I purchased them for my '66 Road Wheels, but they don't fit. Picture of my wheel attached, also. They are GM N.O.S. #1375993 Approx 3" diameter. If anyone can use them, send me a message. $100 plus actual shipping. Jeff