Checking Valve Lift

Dean Feiock · 06-14-2012, 07:48 PM

Using my 305 as an example, I have seen valve lift checked several ways. Assuming you have the correct lifter with the correct pushrod cup height, which way is the correct way or should I say NHRA approved way to set .000" lash?

1)Rocker adjusting nut turned hand tight?

2)Rocker adjusting nut turned down untill .001" retainer movement is established?

In my case, with 200+ LB's of seat pressure, the difference between the two methods could be more than a half turn on the adjusting nut. One half turn on a 7/16-20 stud would be .025".

As I said, I have seen tech check it both ways. Can Travis answer this or should I send a note to Tech?

06-14-2012, 07:48 PM	#1
Dean Feiock Member Join Date: Aug 2002 Location: Pierre, SD Posts: 204 Likes: 0 Liked 49 Times in 15 Posts	Checking Valve Lift Using my 305 as an example, I have seen valve lift checked several ways. Assuming you have the correct lifter with the correct pushrod cup height, which way is the correct way or should I say NHRA approved way to set .000" lash? 1)Rocker adjusting nut turned hand tight? 2)Rocker adjusting nut turned down untill .001" retainer movement is established? In my case, with 200+ LB's of seat pressure, the difference between the two methods could be more than a half turn on the adjusting nut. One half turn on a 7/16-20 stud would be .025". As I said, I have seen tech check it both ways. Can Travis answer this or should I send a note to Tech? __________________ Dean Feiock -- Stock 5002