How do yo do that cut???

[Naiveambition]

I was looking at this photo posted for the heads posted here,. This is not my work,
so with that said I thought it may be a good thread for explanation of complicated cuts that the rest of us draw a blank. Maybe post your pic and setup. And open to any question / poster.

Here is mine. In the photo, how would u cut the recess down from the top of the cylinder. The half moon. I'm guessing this is clearance for the head bolts.
My initial thinking would be a flycutter, though I also would be worried about interrupted cuts ruining the finish. Grinding maybe?. Can't figure it out


Mike

 

[Swifty]

"T" slot cutter will do the job.

Paul.

 

[kvom]

Woodruff cutter.

 

[Naiveambition]

Ahh the lights are coming on now. Thanks

 

[tomrux]

I am having trouble seeing the reason behind them.
Surely with that thin fin in there distortion is going to happen when tightening a bolt. yes if it took out the top fin but not as it sits, that is going to bend.

Tom R