Bearing clearance hardware question

[Craig13]

So this probably seems like a reaaaaallllllyyyyy stupid question but ARP hardware is expensive and I dont wanna F this up. I am getting ready to check my oil clearances for main and rod bearings and I am wondering if I should use the new ARP hardware that will be going in the car when I torque the girdle and rod caps to measure, or should I use the old hardware so the new ones don't get stretched at all before they are installed for final assembly? Thanks for any advice.

 

[jakelandry]

Use the new. They don’t stretch from being torqued. They elongate over time from the torque combined with millions of numerous ksi combustion cycles. Also I have personally used bolts then studs just to see the difference and I got swings of up to .0003”.

 

[ThunderChild]

As @jakelandry said, use the hardware you intend to install, otherwise measurements will be different. Arp recommends multiple tq cycles before final torquing anyway.

 

[Craig13]

Okay awesome. Thanks for the help!