ARP rods bolts need to be stretched to spec, are you getting that proper stretch with just a torque wrench? I did some testing on different thread lubricants vs ARP fastener lube with a Snap on digital torque wrench vs a stretch gauge. Using ARP SBC Rod bolts (tests performed multiple times on different bolts to confirm results)
**Bolts are not being reused after testing as I don't trust them now, but none of the bolts tested stretched more than .001 from original size (ARP spec)**
NOTE: Remember to have you rods resized when ARP Bolts are installed! The clamping force is greater with arp bolts causing the bore to distort.
Rod bolt stretch Gauge
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ARP Rod bolts (SBC) 305,307 to 350
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ARP rod bolts (SBC) 400
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ARP rod bolts (SBC) 283-327
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