Engine head torque ratio

[bonaparte]

Hello,
I am new to this forum. I purchased an 86 454 ltd about 4 months ago. I am now noticing that oil may be leaking from the head gasket. Before I go out and get this repaired I wanted to check the torque on the head bolts. Does anyone know what the torque ratio should be on the bolts? I cant seem to find any info on it. I hope the fix is just simply tightening the bolts a bit.
Thanks,
Bill

[knoizy]

9.8Nm, 2.5kgm, 18ftlb

Which does seem a bit low, I bet the bolts are already tighter than that!