Reply to "connecting rod nuts (again)"

I have not experienced this myself, but I have been told by a very ardent, old time Ford racer (west coast drag racing) that the threads strip out of the premium Boss 351 rod nuts just as easily as they strip out of the non-Boss rod nuts.

Bottom line ... the standard 150,000 psi rod bolt and standard nut, OR the 180,000 psi Boss 351 bolt and Boss 351 nut will fail in the mode exhibited in the picture I posted earlier (the threads stripping out of the nuts). The standard 150,000 psi rod bolt combined with ARP nuts resolves that mode of failure. This has been proven over and over, for the last 3 decades.

I am not claiming the clamping force is any stronger than the 150,000 psi rod bolt, but that's strong enough for high performance street, and it has been used in racing applications too (confession of that same old time Ford drag racer). The simple fact is the nuts are defective, and the strength of the bolt is of no consequence when it is mated to a defective nut.

Have a good weekend everyone!

-G