roller rocker valve lash adjustment

Red Hot 92 · May 13th, 2007, 09:43 PM

I understand how and in what order to adjust the valves. I have a crane roller rocker setup and they want 1/2 to 1 turn past zero lash. It is a non-daily driven 347 with a hydraulic roller cam, and I have always heard various opinions on valve lash. I was going to go with 1/8 past zero but that still feels a little loose. Any suggestions?

Darrell · May 13th, 2007, 11:36 PM

Do one cylinder at a time. When the exhaust valve starts to open, adjust the intake rocker arm. When the intake valve starts to CLOSE, adjust the exhaust rocker arm. Rotate the pushrod and tighten the poly lock until you start to feel tension on the pushrod. Then go 1/4 turn tighter.

ken5_0 · May 14th, 2007, 09:16 AM

Same with trickflow zero lash?

Darrell · May 14th, 2007, 09:33 AM

Originally Posted by ken5_0

Same with trickflow zero lash?

This is the same for all hydraulic cams. This is how you adjust solid cams as well but you set valve lash instead of preloading the lifter.

ken5_0 · May 17th, 2007, 09:41 AM

Thanks. When is the next performance 101 class?

Oh and cant you just set the lash when the cam is off lobe? or is it best to do one intake and exhaust at a time? pretty easy to see if it is off lobe.

Darrell · May 17th, 2007, 09:33 PM

Originally Posted by ken5_0

Thanks. When is the next performance 101 class?
Oh and cant you just set the lash when the cam is off lobe? or is it best to do one intake and exhaust at a time? pretty easy to see if it is off lobe.

You can do it however you want. They method I mentioned is easy and accurate.

ryans88gt · May 19th, 2007, 11:49 PM

Originally Posted by ken5_0

Thanks. When is the next performance 101 class?
Oh and cant you just set the lash when the cam is off lobe? or is it best to do one intake and exhaust at a time? pretty easy to see if it is off lobe.

Is it easy to see 0.010"?? I wouldn't want my preload off by more than that!

If you do this wrong, you'll wish you did it right while you are cleaning what used to be a cam lobe out of your oil pan. If you adjust the intake when the exhaust is opening and the exhaust when the intake is closing you will be 100% sure that the cam is off lobe.

HMUSN · May 19th, 2007, 11:51 PM

damn darrell.

you know everything.

May 13th, 2007, 09:43 PM	#1
Red Hot 92 Newbie Join Date: Apr 2007 Posts: 6	roller rocker valve lash adjustment I understand how and in what order to adjust the valves. I have a crane roller rocker setup and they want 1/2 to 1 turn past zero lash. It is a non-daily driven 347 with a hydraulic roller cam, and I have always heard various opinions on valve lash. I was going to go with 1/8 past zero but that still feels a little loose. Any suggestions?

May 13th, 2007, 11:36 PM	#2
Darrell MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 6,579	Do one cylinder at a time. When the exhaust valve starts to open, adjust the intake rocker arm. When the intake valve starts to CLOSE, adjust the exhaust rocker arm. Rotate the pushrod and tighten the poly lock until you start to feel tension on the pushrod. Then go 1/4 turn tighter. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

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May 14th, 2007, 09:16 AM	#3
ken5_0 Regular Join Date: Aug 2006 Posts: 192	Same with trickflow zero lash?

May 17th, 2007, 09:41 AM	#5
ken5_0 Regular Join Date: Aug 2006 Posts: 192	Thanks. When is the next performance 101 class? Oh and cant you just set the lash when the cam is off lobe? or is it best to do one intake and exhaust at a time? pretty easy to see if it is off lobe.

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