I have a '85 Nissan pickup. I wonder if anyone can tell me what size the bolts are the hold the exhaust manifold to the block? For some reason 3 are missing and there's a pretty bad exhaust leak. I've tried 8MM X 1.25 X 30, 8MM X 1.25 X 40 and 5/16-18. The 8X1.25 and the 5/16-18 start to thread in but stop after about 2 turns.
Auto Zone didn't have any other sizes that were close.
Thanks in advance for your help.
Ron