I have a full set of SD-455 factory rod bolts and nuts. I do not know if they are NOS or not. They were installed in a fresh rebuild SD-455 in 1979. The engine was never started. But I do not know if they were the OE bolts or NOS when they were installed. That is why I did not use them. Important note: If your holding out for one rod nut, please be aware that they are not 7/16" SAE fine. They are a special thread pitch, not fine or coarse. If you buy ARP replacement bolts, they are NOT the special pitch, they are regular SAE 7/16-20. So in summary, you need the specific nut for an SD-455 rod bolt to have the correct assembly. If you have a need and desire to use the OE SD-bolts, PM me and I will sell you the set at a very reasonable price. Finding a single correct nut will be pretty difficult due to what I mentioned above.
I found the thread pitch. Those nuts are 7/16-24 UNS (Unified Special Thread)
Last edited by mgarblik; 11-25-2024 at 12:29 PM.
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