Looking at the FSM I see a measurement for the Head Bolts of 0.4272 to 0.4331 standard measurement with minimum of 0.417". Where is that measurement taken?
I assume it is the threaded section as noted below for the Main Bearing Cap Bolts but not able to find a diagram specifically stating so.
I assume it is the threaded section as noted below for the Main Bearing Cap Bolts but not able to find a diagram specifically stating so.