Steve, Bob shifted at 6,600 way below the power range and ran a 5.80. So I have no complaint on it's speed.

Bob was on the way to making a lot of changes on this engine after the valve broke. IMO he went in the right direction. Should not have any future trouble.

The headers tubes are small. They are stepped and tri Y. I think they are 1 5/8 when they come off the cylinder head. But, to be honest have not measured to see.

Leon