ARP rod bolts fitting

[gitters27]

Instructions advise on bolts having a chamfered finish,what do you guys use to do this,8mm drill bit fractionally touching into the rod cap holes?

[totalnova]

Just use a countersink drill bit, just need to take a 1mm of material away to let the rod bolt sit correctly.

[gitters27]

Could I use a hss drill bit if not what size countersink bit am I best buying?

[Iain]

Yeah you can get proper countersink ones, different angle. Don't have to take much off really. Do it carefully in a pillar drill, I found it easy to take off way too much material!

[Pipsovich]

Thread is old, but for future info:
Do not use a drill bit.
Use a proper countersink of good quality.
I have done this with a power screwdriver, i dont see the need to use a pillar drill. Have been ok for me, on road and trackdays

[total_vauxhall]

Im here scratching my head wondering why I never had to do this :confused: then I remembered iv got pec rods in lol
Few hahaha