TucsonHooligan
Well-known member
Looks like that article pertains to roller rockers that are adjustable. I have standard rockers that are non-adjustable. Or am I not getting from that article what I should have?
Standard rockers still leave a footprint.TucsonHooligan":35d5uh5j said:Looks like that article pertains to roller rockers that are adjustable. I have standard rockers that are non-adjustable. Or am I not getting from that article what I should have?
Ok, so I got ahold of an adjustable pushrod and am ready to determine the length I need. I know the lifter has to be on the low-end (back side) of the cam, so I put cylinder #1 on the compression stroke. This should have the cam on the low.
Question is, where does this put the play in the lifter? Without oil pressure, is the lifter fully bottomed out or at its peak?
When I find the length of the rod, do I need to add or subtract .0625? Since the motor doesn't run, I cant really "pump up" the lifters, can I? This is the last key to the puzzle, and I should be able to get this taken care of over the weekend
Looks like I got it. Adjustable measured out at 8.158 approx, so I added .0625 and got 8.2205, or 8.225 rounded to the nearest thou that I could buy easily, since CI stocks them.
should work out fine from here on out (ha!), but does anybody have and last minute advice or ideas?
TucsonHooligan":1fq7iinl said:Looks like I got it. Adjustable measured out at 8.158 approx, so I added .0625 and got 8.2205, or 8.225 rounded to the nearest thou that I could buy easily, since CI stocks them. should work out fine from here on out (ha!), but does anybody have and last minute advice or ideas?
CNC-Dude":32jtxiy3 said:As with any non-adjustable valvetrain on any engine, there is a relatively tight margin that has to be held to ensure you have consistent valve tip heights on all the valves. From the factory, whether it was Chevy, Ford or Chrysler, the principal and techniques were the same. Most any hydraulic lifter that has ever been produced requires no more than between .025-.045 of preload to perform at its optimum(check Crane, Comp, Isky for their recommendations). So you can see that if you dont have real consistent valve tip heights from valve to valve, you are going to have the potential to either over compress the lifter, which can wipe a lobe of the cam if too excessive, or be too loose and have the rocker arm rattle. This makes a non-adjustable setup really need to be very accurately done by whoever does the valve job and assemble the head. With an adjustable valvetrain, this becomes less critical because you have the ability to compensate for inaccuracies in the valve heights and adjust or fine tune the lifter preload accordingly. Once you lay a straight edge across your valve tips you will know right away how much of an issue you are facing. If they are all within .010-.015 thousandths of the same, then that should be acceptable, but if they are all over the place, I would want the margins tightened up more to ensure more consistent preload.
bubba22349":2bwjgwiw said:Are they the stock rockers they should be made for the 5/16 push rods? Do you have way to post some pictures of the parts?