Panhead head insert bolt

[Nick9900]

Is it possible or safe to attempt to counter sync the insert? I have one on a head I had re done for valve seats. Noticed the insert being slightly raised. Have concerns the head won't seal due to that.

[Excalibur]

If I understand correctly, a head bolt threaded insert is proud of the headface.

I had the same issue with my Shovel project having multiple proud inserts. I fixed it using a counterbore endmill in cordless drill as pictured. Also a threaded adaptor to centralize it.
Hopefully picture is a 1000 words...
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Done 150 miles so far...

Hope this helps. Good luck.

[CraigArizona85248]

The machinist I used for years (he passed 2 years ago) told me not to counter sink the inserts on a panhead.  He said he would do this for a shovel, but not a pan.  He always returned my heads to me after grinding the surface (and insert) flat.

-Craig

[JSD]

Wonder what his reasons were ?

[Ohio HD]

You'll just pull the insert down again with the poor QC sand cast heads the Pan Heads are.

[JSD]

Good info thanks Ohio.

[nmainehunter]

Ideally it should be machined but you can easily do it with a flat mill file. Countersinking won't do this for you.