Are these aftermarket rod bolts or factory?

[Gunner1]

The PO didn’t remember what bolts his builder used. All I have is this one picture when my guy checked some bearings and confirmed it was balanced. This is an older build. Maybe 8 to 10 years ago. It spins 5500 easily and is smooth as glass.
Thanks guys.
Bob.

 

[69Bee]

Hard to tell, but my money is on original. The nut on the top has a shiny side which is indicative of bring previously installed, and upon re-install, flipped over. The rod less the cap is easier to see the rod bolt top with a mirror. You would be looking for "ARP" on the top of the bolt. OE bolts don't have anything on them IIRC.

 

[Lefty71]

What's the build?? Looks like cast crank and stock everything. They ground the snot out of the rod caps. Must be really light pistons??

 

[Gunner1]

What's the build?? Looks like cast crank and stock everything. They ground the snot out of the rod caps. Must be really light pistons??

76 440 out of a motorhome. Cast crank. Speed Pro 2355 030. Clevite rod and mains. Billet t chain set. Stock 452 heads all fresh. Comp 224@050 cam. Rpm with a 600 eddy carb. It was a basic rebuild with good parts. Now it’s cnc stealths, Isky 292 mega cam, full msd system headers and a 750 DP. There’s nothing stamped on the bolt heads.