Can anyone tell me if these are water pump bolts? I have 4 of them with RSC Head markings and need to confirm what they are from. They're 3/8" and are the same length as the circled dogbone exhaust manifold bolts seen on the left. I was hunting for original manifold bolts when I ran across these. Still need to find more of the original manifold bolts as I'm coming up short here.
Thanks in advance for any info on these head markings.
