Stock head studs?

[mattasi]

Hello, below is a picture of my spare motor, simply asking if the head studs are aftermarket? I thought stock they were bolts not studs. On my GSX they are engraved with APR on the top, but these ones have nothing engraved on them at all.

Thanks guys

 

[19Eclipse90]

They are aftermarket. All stock head-to-block fasteners were bolts for these cars.

 

[mattasi]

cool thanks man

Today I cleaned them and looked better and I see that they do in fact say ARP on them.