How far can I go with the thermactor hump (porting)

[travis]

Charlie, how much was you able to take off the intake side of the exhaust bowl? Mine has a pretty significant “lump” in the bowl on that side that sticks out into the exhaust flow path quite a bit, but I understand that side is pretty thin.

[Carnut1]

Charlie, how much was you able to take off the intake side of the exhaust bowl? Mine has a pretty significant “lump” in the bowl on that side that sticks out into the exhaust flow path quite a bit, but I understand that side is pretty thin.

Without a good sonic I would say .050" max. Just give it some shape and go easy. That side is hot due to limited water between the ports.

[Abbottracingheads]

You can grind the whole thermactor bump out. Do not go down beside the guide boss on the intake valve side of the port very much because there is water there. Been there done that.

[Carnut1]

Resized_20190824_130840_703.jpeg

You can grind the whole thermactor bump out. Do not go down beside the guide boss on the intake valve side of the port very much because there is water there. Been there done that.

This is good advice. This is a 289 cutaway, notice how close the Intake and exhaust ports are.