[Rich Biebel]

" I then cut a carbon relief slot in the bottom of the exhaust guide with a .450 reamer .125 deep."

You lost me on the above operation ? A picture is worth a thousand words.

Practically all the head work I did over many years was without the use of a seat and guide machine. Benchtop operations.....hand held drills and tooling.

I did buy out a machine shop in the early 1990's and that buy included a Kwik Way 019 S&G machine. I did not use it much. Eventually sold it for a giveaway price.

Nice work on the BB heads and I hated replacing the stock guides in them. I would leave them and thin wall line them mostly due to the rediculous way GM factory drilled the guides off center from the seats on some. Also the potential water leak issue passing thru the water jacket.

I have taken brand new aluminum heads from the big name manufacturers with nice looking Serdi cut seats so far off the old valve bounce test is a NO bounce and just a thud......LOL

Bought a set of Darts for my own engine. Operator who did the VJ on them must have been drunk......had to use my old school stones to fix it.....Not fun but I make it work...

Your work is excellent.....