[Brian D'Amico]

To see if it's a rod knock... start the engine and tgry to find out which side the sound is coming from. Once you can locate which side (lets say it's coming from the drivers side).. shut off the motor & pull the #1 spark plug wire. Start the car and see if it's still knocking.. if so, go to #3... continue this process until the knock disappears.. If you can make the knock go away by pulling the plg wire.. then it's a spun rod bearing.

I just finished a rebuild on my 67 400 and I did all the labor myself (with help of friends) Parts and machine work came out to approx. $2800 bucks!! ..and I had to assemble it myself and put it back in the car too. It ain't cheap.
I live right outside of Columbus.. and I'm having to do a 2nd rebuild because of a defect in my block... This time I'm taking it to a shop here in town.
The best place to go is Hillards Performance outside of Springfield. Dave is a Pontiac guru!! He and his dad (Jim) are GREAT and they will treat you right. All they work on and race is Pontiacs. Dave has a 67 GTO that he races and he came in 1st place this year at Norwalk!! He's doing my #2 rebuild as we speak!

His number is 937-244-1111. Tell him Brian D'Amico sent you.

I wish you luck.. This board is a great place to find help and asking for advice.. Let us know what you find out!!