Stock Valve Lift

Jeff Lee · 09-10-2009, 11:59 AM

It's NHRA's testing procedure so they should have the tools necessary to do the job. If their lifter does not match your lifter's plunger height you "could" argue it is an invalid test if the test shows you are out of compliance. But if you want to avoid such issues (and I recommend you do), carry your own checking / solid lifter with the correct specs. And yes, the check is made at zero lash.
My opinion is finding every .001" of lift is not a real big deal. The rest of the cam specs is what really makes a big deal. I've been .015"-.020" under max lift and never felt it was a problem. Point is, like Ron Mattson stated below, give yourself a cushion.

Alan Roehrich · 09-10-2009, 01:08 PM

Jeff, I asked this very question a week or two ago. I was told by a division tech director that NHRA supplies the solid lifter for checking lift on a hydraulic cam and you may not supply your own. I was working on a hydraulic lifter engine, and was going to just get an extra solid lifter and check everything, and give the guy the lifter to keep with him. I was told NHRA would not use any lifter I was going to provide, they would use their own.

Rory McNeil · 09-10-2009, 08:22 PM

Quote:

Originally Posted by Alan Roehrich

Jeff, I asked this very question a week or two ago. I was told by a division tech director that NHRA supplies the solid lifter for checking lift on a hydraulic cam and you may not supply your own. I was working on a hydraulic lifter engine, and was going to just get an extra solid lifter and check everything, and give the guy the lifter to keep with him. I was told NHRA would not use any lifter I was going to provide, they would use their own.

I don`t how "oddball" a 5.0 Mustang Stocker is, but I`ve torn down 3 times here in Div.6, and the certification team never had a "solid" Ford hyd. roller lifter in their kit. The first time, I ended up having to disassemble on of my own lifters,& "plug" it. After that, I just kept a plugged lifter of my own in my tool box, and on 1 ocassion, the cert .team borrowed my checking lifter.

Alan Roehrich · 09-10-2009, 08:46 PM

I suppose I shouldn't be surprised that they don't have a lifter for that. They certainly should. Shoot, I have one that I use to check piston to valve clearance.

Gary H Humrichouse · 09-10-2009, 10:18 PM

The check lifter they use it made by Clark Holroyd. He will sell one to you.

09-10-2009, 11:59 AM	#1
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: Stock Valve Lift It's NHRA's testing procedure so they should have the tools necessary to do the job. If their lifter does not match your lifter's plunger height you "could" argue it is an invalid test if the test shows you are out of compliance. But if you want to avoid such issues (and I recommend you do), carry your own checking / solid lifter with the correct specs. And yes, the check is made at zero lash. My opinion is finding every .001" of lift is not a real big deal. The rest of the cam specs is what really makes a big deal. I've been .015"-.020" under max lift and never felt it was a problem. Point is, like Ron Mattson stated below, give yourself a cushion. __________________ Jeff Lee 7494 D/S '70 AMX

09-10-2009, 01:08 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,125 Likes: 1,583 Liked 1,880 Times in 422 Posts	Re: Stock Valve Lift Jeff, I asked this very question a week or two ago. I was told by a division tech director that NHRA supplies the solid lifter for checking lift on a hydraulic cam and you may not supply your own. I was working on a hydraulic lifter engine, and was going to just get an extra solid lifter and check everything, and give the guy the lifter to keep with him. I was told NHRA would not use any lifter I was going to provide, they would use their own. __________________ Alan Roehrich 212A G/S

09-10-2009, 08:46 PM	#4
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,125 Likes: 1,583 Liked 1,880 Times in 422 Posts	Re: Stock Valve Lift I suppose I shouldn't be surprised that they don't have a lifter for that. They certainly should. Shoot, I have one that I use to check piston to valve clearance. __________________ Alan Roehrich 212A G/S

09-10-2009, 10:18 PM	#5
Gary H Humrichouse Junior Member Join Date: Jan 2008 Location: calif Posts: 11 Likes: 0 Liked 1 Time in 1 Post	Re: Stock Valve Lift The check lifter they use it made by Clark Holroyd. He will sell one to you. __________________ Gary H Humrichouse 736 STK

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