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Thread: ARP rod bolts fitting

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    Default ARP rod bolts fitting

    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?

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

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

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    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!

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    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

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

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