So I thought I would take a crack at porting heads on my own. I read a couple different articles about a quick porting job on the 706 castings, so I figured I would give that a try.
This is the article I based my efforts around.
https://www.motortrend.com/how-to/ls...mber-work/amp/
So I got a set of carbide bits and cartridge rolls off Amazon, and went to town. The whole intent was to just unshroud the outside edges of the valves. I used the 6.0 gasket as a template, and scribed a line where the gasket would lie. I made sure I had at least 0.180” clearance between the edge of the valve and the edge of the head at all points in the lift range. This wasn’t too hard to do. I made sure to keep the shape as consistent as I could from cylinder to cylinder. Overall…this was pretty easy. I’ll see if it makes a difference when I put the whole thing together. From most of the research that I did, it should be good for something like 10-15hp.
While I was at it, I chased all of the threads in the head and cleaned everything up all nice.
Next step, lap the valves, put in new springs, and trunion upgrade kit.