In Reply to: CYLINDER HEAD STUDS, HEX NUTS & HEX BOLTS posted by Tim Daley(MI) on September 07, 2018 at 17:57:42:
Although this option would be more expensive, if I was doing an engine rebuild, I would replace the studs and hex nuts with an exact-as-original 7/16-14" x 2-3/8" Hex Head Bolt that JUST8Ns makes and sells -see LINK below. The bolt is the exact length of the original with the AF dimension of the head exact as original too -11/16". They are specially made according to Derek, Grade 8, and thus why the $5.10 price tag per unit. Not even McMaster-Carr makes one close. They have Extra Wide/Heavy Head ones but have none listed in the 7/16 thread size. The Hex Head bolts have another advantage too -you can use them in all 18 holes. With the studs, 15 are 2.78" long and 3 are 2.90" long. Also, you don't want to use washers either. OEM's never had them plus they will affect your torque values. Finally, here's the original Ford 4-Cylinder Flat Head torque spec chart for use as a guide. Be sure you know specs are different for the 7/16 hex nuts than the 7/16-14 hex bolts and how to set the value in the correct scale. The chart lists values in Foot-Pounds. Torque wrenches can have scales in one, two, or all of these: Inch-Ounces, Inch-Pounds, Foot-Pounds, Meter-Kilograms, or Newton-Meters. Your wrench should have an instruction sheet with the conversion formulas on it for all. Know the proper use of a torque wrench and the correct method to torque a fastener -in three steps. Take the nominal finish spec, we'll use 54 Ft/Lbs in this example. 54/3=18. Set scale to 18 Ft/Lbs for the first pass and follow torque sequence from chart. For the 2nd pass set the wrench scale to 36 Ft/Lbs and repeat sequence. For the 3rd and final sequence pass, the scale is set to 54 Ft/Lbs. NEVER use a torque wrench to loosen a fastener with -it'll ruin the lead screw and give inaccurate readings. Always loosen the locking ring when making an adjustment. Always turn the thimble back a few revolutions and slowly advance towards the main scale setting number you wish in order to keep the backlash out. Always be sure to lock the ring once setting is reached. If wrench is not to be used in a long while, loosen the locking ring and turn thimble back to the lowest setting and keep well lubed.
FORD N-SERIES TRACTOR FLATHEAD TORUE SPEC CHART: