I know, I know
...call me a PERFECTIONIST !
I'm setting up 4.0 heads for my Cherokee engine rebuild, want to shim the new stock springs to affect the same cam nose pressure on all 12 springs. Even though the springs are new, all new valve springs will vary slightly as a normal manufacturing thing.
Problem is, manual says "Valve closed height is 1.625 @ 66-74 *lbf* which is foot-pounds. The manual shows using a beam torque wrench on an old-fashioned lever-arm spring tester. For example: 66-74 ft-pounds of lever-arm pressure could actually translate into something like 100 pounds on a inline direct-pressure tester...depending on the length of that lever-arm as displayed in the manual!
Therefore, does anybody know the INLINE spring pressure that should be @ 1.625" installed height in valve-closed position? I have a platform-type inline spring tester with a gauge showing actual pounds of pressure, intended to be used in a bench vise.
Yes I realize most folks just install the springs as is and call it good, but I like a real smooth-running engine with even cam nose pressure all the way across the valves. Yes I realize coil bind is the MOST important issue (too much shim).