When I seen all the craggy intrusions from casting on the otherwise shiny new head, I figured it was the perfect opportunity to remove the intrusions into and smooth out the ports. Since it's direct injection the fuel mixing in the piston, allows for the inlet ports to be polished too.
I have not changed the shape or made exhaust ports bigger as indeed this can slow the airspeed down and loose low down torque. it's more tractor than hi revving engine.
But some sensitive cleaning of the airways is just like blowing your nose, and polishing which is taking me a very long time because I'm no pro, is free horses and could improve economy and responsiveness.
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I'll also lap the valves with 300then 600 grit paste for a better than factory cut seal. There's often some chatter in the seats from factory and lapping can quickly show this and with a very fine finish of 600,get a better seal.
I know she's just an old truck, but she drives really nice, off roading in my small woods several times a week.
The too of the inlet spiral air path was particularly cruddy ant this is where the air is moving fastest, and this is actually them cleaned up quite a bit!
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Still lots of polishing to do before lapping the valves.
Bit like fishing really